CN118465790B - Positioning performance evaluation method, device and electronic equipment - Google Patents

Abstract

The embodiments of the present application provide a positioning performance evaluation method, device and electronic device, which relate to the field of antennas and can use the number of positioning satellites that can be tracked and captured by the positioning antenna above a certain elevation angle, and the carrier-to-noise ratio of the positioning satellite signals received by the positioning antenna as evaluation parameters to comprehensively evaluate the positioning performance of the positioning antenna, and the evaluation results are more comprehensive and accurate. The method includes: obtaining the gain of the positioning antenna in each directional interval above a preset elevation angle, and the density of the number of satellites corresponding to each directional interval. According to the gain of the positioning antenna in each directional interval, the carrier-to-noise ratio corresponding to each directional interval is determined. The density of the number of satellites corresponding to each carrier-to-noise ratio is used as an evaluation parameter to evaluate the positioning performance of the positioning antenna.

Description

Positioning performance evaluation method and device and electronic equipment

Technical Field

The embodiment of the application relates to the field of antennas, in particular to a positioning performance evaluation method and device and electronic equipment.

Background

Positioning antenna refers to an antenna in an electronic device for communication with a satellite positioning system. The satellite positioning system may include a Beidou satellite navigation system (Beidou Navigation SATELLITE SYSTEM, BDS), a global positioning system (Global Positioning System, GPS), a global orbiting satellite system (Global Orbiting Navigation SATELLITE SYSTEM, GLONASS), a Galileo satellite navigation system (Galileo satellite navigation system), and the like. The positioning antenna realizes the functions of positioning, navigation and the like of the electronic equipment by receiving signals of the satellite positioning system.

In selecting or analyzing a positioning antenna, it is often necessary to evaluate the positioning performance of the positioning antenna. In the scheme for relevant evaluation of positioning performance, the evaluation parameters are single, and the positioning performance of the positioning antenna cannot be comprehensively and accurately reflected.

Disclosure of Invention

The embodiment of the application provides a positioning performance evaluation method, a positioning performance evaluation device and electronic equipment, which can comprehensively evaluate the positioning performance of a positioning antenna by combining the number of positioning satellites which can be tracked and captured above a certain elevation angle of the positioning antenna and the carrier-to-noise ratio of positioning satellite signals received by the positioning antenna as evaluation parameters, and the evaluation result is more comprehensive and accurate.

In order to achieve the above purpose, the following technical scheme is adopted in the embodiment of the application.

In a first aspect, a positioning performance evaluation method is provided, which is applied to an electronic device. The method comprises the steps of obtaining gains of the positioning antenna in all direction intervals above a preset elevation angle and satellite quantity densities corresponding to all direction intervals. In a spherical coordinate system with the positioning antenna as a sphere center, each direction interval forms the same angle with the sphere center. The satellite number density corresponding to one direction interval refers to the sum of probabilities that each positioning satellite in the satellite positioning system appears in one direction interval. And determining the carrier-to-noise ratio corresponding to each direction interval according to the gain of the positioning antenna in each direction interval. The carrier-to-noise ratio corresponding to one direction interval refers to the carrier-to-noise ratio of the signals of each positioning satellite in one direction interval. And (3) taking the satellite number density corresponding to each carrier-to-noise ratio as an evaluation parameter to evaluate the positioning performance of the positioning antenna. The satellite number density corresponding to one carrier-to-noise ratio refers to the sum of satellite number densities of the direction intervals in which the corresponding carrier-to-noise ratio is greater than or equal to one carrier-to-noise ratio. The positioning performance of the positioning antenna is positively correlated with the evaluation parameter.

Based on the scheme, when the positioning performance of the positioning antenna is evaluated, the number of the positioning satellites which can be tracked and captured above the evaluation elevation angle of the positioning antenna is considered, the carrier-to-noise ratio of the positioning satellite signals received by the positioning antenna is also considered, the evaluation parameters can reflect the positioning performance of the positioning antenna in the whole direction above the evaluation elevation angle, and the evaluation result is more comprehensive and accurate.

In one possible implementation, obtaining the satellite number density corresponding to each directional interval includes determining a total duration corresponding to each elevation interval according to the location information of the positioning antenna. Each elevation interval consists of a directional interval of the same elevation angle. The total duration corresponding to the elevation angle interval refers to the total duration of each positioning satellite in the elevation angle interval in one ground-surrounding period of the positioning satellite. And respectively calculating the ratio of the total duration corresponding to each elevation interval to the ground winding period to obtain the satellite quantity density corresponding to each elevation interval. And determining the satellite number density corresponding to each direction interval according to the satellite number density corresponding to each elevation interval and the angle value corresponding to each direction interval in the azimuth axial direction of the spherical coordinate system. Based on the scheme, the satellite number density in each direction interval can be accurately determined by combining the position information, so that the satellite number density in the first direction interval, namely the sum of the probabilities of each positioning satellite in the direction interval, is directly and accurately calculated, and the accuracy of the evaluation result is improved.

In one possible implementation, obtaining the gain of the positioning antenna in each direction interval above a preset elevation angle includes obtaining a pattern of the positioning antenna. And determining gain distribution of the positioning antenna in each direction above a preset elevation angle according to the directional diagram of the positioning antenna. And determining the gain of the positioning antenna in each direction interval according to the gain distribution of the positioning antenna in each direction, wherein the gain of the positioning antenna in one direction interval is positively correlated with the gain distribution in each direction in one direction interval. Based on the scheme, the gain of each direction interval can embody the gain distribution of each direction in the corresponding direction interval, and the accuracy of the evaluation result is improved.

In one possible implementation, the gain of the positioning antenna in each direction interval is determined according to the gain distribution of the positioning antenna in each direction, and the gain average value of the positioning antenna in each direction in the direction interval is calculated and used as the gain of the positioning antenna in the direction interval. Or, randomly selecting the gain in any direction in the direction interval as the gain of the positioning antenna in the direction interval. Based on the scheme, the gain of each direction interval can embody the gain distribution of each direction in the corresponding direction interval, and the accuracy of the evaluation result is improved.

In one possible implementation, the method further includes determining an estimated elevation angle based on the user input before obtaining the gain of the positioning antenna for each directional interval above the estimated elevation angle. Or detecting a shielding object within a preset distance. The estimated elevation angle is determined from the maximum elevation angle of the obstruction. Based on the scheme, the influence of the shielding object shielding on the accuracy of the evaluation result can be avoided.

In one possible implementation, before obtaining the gain of the positioning antenna in each direction interval above the preset elevation angle, the method further comprises determining the preset elevation angle according to the user input. Or detecting a shielding object within a preset distance. And determining a preset elevation angle according to the maximum elevation angle of the shielding object. Based on the scheme, the influence of the shielding object shielding on the accuracy of the evaluation result can be avoided.

In one possible implementation, determining the carrier-to-noise ratio corresponding to each direction interval according to the gain of the positioning antenna in each direction interval includes determining the carrier-to-noise ratio estimation value corresponding to each direction interval according to the preset parameter and the gain of the positioning antenna in each direction interval. The preset parameters comprise the power of signals of the positioning satellites reaching the ground, the Boltzmann constant, the reference temperature of thermal noise, the noise coefficient of the radio frequency front end and the quantization loss of the radio frequency front end. The carrier-to-noise ratio estimation value corresponding to one direction interval is positively correlated with the gain of the positioning antenna in one direction interval. And rounding the carrier-to-noise ratio estimated values corresponding to the intervals in all directions respectively to obtain the carrier-to-noise ratios corresponding to the intervals in all directions. Based on the scheme, the calculation amount is reduced, and the evaluation efficiency is improved.

In one possible implementation manner, after the carrier-to-noise ratio corresponding to each direction interval is determined according to the gain of the positioning antenna in each direction interval, the method further comprises rounding the carrier-to-noise ratio corresponding to each direction interval before the positioning performance of the positioning antenna in the reference scene is evaluated by taking the satellite number density corresponding to each carrier-to-noise ratio as an evaluation parameter. Based on the scheme, the calculation amount is reduced, and the evaluation efficiency is improved.

In a second aspect, an apparatus for evaluating positioning performance is provided, which is applied to an electronic device. The device comprises a first module, a second module and a third module, wherein the first module is used for acquiring the gain of the positioning antenna in each direction interval above a preset elevation angle and the satellite number density corresponding to each direction interval. In a spherical coordinate system with the positioning antenna as a sphere center, each direction interval forms the same angle with the sphere center. The satellite number density corresponding to one direction interval refers to the sum of probabilities that each positioning satellite in the satellite positioning system appears in one direction interval. And the second module is used for determining the carrier-to-noise ratio corresponding to each direction interval according to the gain of the positioning antenna in each direction interval. The carrier-to-noise ratio corresponding to one direction interval refers to the carrier-to-noise ratio of the signals of each positioning satellite in one direction interval. And the third module is used for evaluating the positioning performance of the positioning antenna by taking the satellite number density corresponding to each carrier-to-noise ratio as an evaluation parameter. The satellite number density corresponding to one carrier-to-noise ratio refers to the sum of satellite number densities of the direction intervals in which the corresponding carrier-to-noise ratio is greater than or equal to one carrier-to-noise ratio. The positioning performance of the positioning antenna is positively correlated with the evaluation parameter.

In a third aspect, a positioning performance evaluation method is provided, and is applied to an electronic device. The method comprises the steps of obtaining gains of the positioning antenna in all direction intervals above a preset elevation angle. In a spherical coordinate system with the positioning antenna as a sphere center, each direction interval forms the same angle with the sphere center. And taking the gain average value of each direction interval as an evaluation parameter to evaluate the positioning performance of the positioning antenna. The positioning performance of the positioning antenna is positively correlated with the evaluation parameter.

Based on the scheme, the positioning performance of the positioning antenna is estimated through the gain mean value of the positioning antenna with more than one elevation angle, and the estimation result can reflect the positioning performance of the positioning antenna in all directions with more than one elevation angle, so that the positioning performance is comprehensive and accurate.

In a fourth aspect, a positioning performance evaluation device is provided, and the device is applied to an electronic device, and includes a fourth module, configured to obtain gains of a positioning antenna in each direction interval above a preset elevation angle. In a spherical coordinate system with the positioning antenna as a sphere center, each direction interval forms the same angle with the sphere center. And a fifth module, configured to evaluate the positioning performance of the positioning antenna by using the gain average value of each direction interval as an evaluation parameter. The positioning performance of the positioning antenna is positively correlated with the evaluation parameter.

In a fifth aspect, an electronic device is provided that includes a positioning antenna, one or more memories, and one or more processors. One or more memories are coupled to the one or more processors, and a positioning antenna is coupled to the one or more processors, the one or more memories storing computer instructions. The one or more processors, when executing the computer instructions, cause the electronic device to perform the positioning performance evaluation method as the first aspect or the third aspect.

In a sixth aspect, a computer readable storage medium is provided, the computer readable storage medium comprising computer instructions which, when run, perform the positioning performance assessment method as in the first or third aspect.

In a seventh aspect, a computer program product is provided, comprising instructions in the computer program product for enabling a computer to carry out the positioning performance evaluation method as in the first or third aspect, when the computer program product is run on the computer.

It should be appreciated that the technical features of the technical solutions provided in the second aspect, the fourth aspect, the fifth aspect, the sixth aspect, and the seventh aspect may all correspond to the positioning performance evaluation methods provided in the first aspect, the third aspect, and the possible designs thereof, so that the beneficial effects that can be achieved are similar, and are not repeated herein.

Drawings

Fig. 1 is a schematic view of a watch dial according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

FIG. 3 is a schematic diagram of the earth's surface according to an embodiment of the present application;

FIG. 4 is a schematic illustration of yet another earth's surface provided by an embodiment of the present application;

FIG. 5 is a flowchart of a positioning performance evaluation method according to an embodiment of the present application;

FIG. 6 is a schematic view of a shelter according to an embodiment of the present application;

fig. 7 is a diagram of an antenna according to an embodiment of the present application;

FIG. 8 is a schematic diagram of a spherical coordinate system according to an embodiment of the present application;

Fig. 9 is a schematic diagram of an area corresponding to each direction interval in a spherical surface according to an embodiment of the present application;

FIG. 10 is a schematic diagram of satellite number density of positioning satellites in each elevation interval according to an embodiment of the present application;

FIG. 11 is a schematic diagram showing a relationship between a satellite number density and a carrier-to-noise ratio corresponding to each carrier-to-noise ratio in different first poses and different positions according to an embodiment of the present application;

FIG. 12 is a schematic diagram showing a relationship between a satellite number density and a carrier-to-noise ratio corresponding to each carrier-to-noise ratio at different first poses and different positions according to an embodiment of the present application;

fig. 13 is a flowchart of another positioning performance evaluation method according to an embodiment of the present application.

Detailed Description

The terms "first," "second," and "third," etc. in embodiments of the application are used for distinguishing between different objects and not for defining a particular sequence. Furthermore, the words "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

With the continuous development of electronic technology and communication technology, the positioning, navigation and other capabilities of electronic equipment are also becoming more and more powerful. Specifically, the positioning antenna achieves positioning and navigation functions by receiving signals from a plurality of positioning satellites in a satellite positioning system.

In order to select or analyze the positioning antenna in the electronic device, the efficiency of the positioning antenna in different scenes or the gain in a certain direction in different scenes can be selected as an evaluation parameter to evaluate the positioning performance of the positioning antenna.

When the positioning antenna is arranged on the watch and is in an arm model scene close to an arm, the gain of the positioning antenna in the sky direction of the watch dial can be selected as an evaluation parameter to evaluate the positioning performance of the positioning antenna, namely, the larger the gain of the positioning antenna in the sky direction of the watch dial is, the better the positioning performance of the positioning antenna is. Similarly, one of the data of the gain of the positioning antenna in the direction of 6 o ' clock of the watch dial facing the sky, the gain of the watch dial in the direction of 3 o ' clock facing the sky, the gain of the watch dial in the direction of 9 o ' clock facing the sky and the like can be selected as an evaluation parameter to evaluate the positioning performance of the positioning antenna.

The watch dial refers to a display screen or a display surface for displaying time in the watch, and the direction of the watch dial facing the sky is the direction of the display screen or the display surface facing the sky. Illustratively, when a user is riding a watch, the watch face is the direction toward the sky.

Several other directions mentioned above are described here. Fig. 1 is a schematic diagram of a watch dial according to an embodiment of the present application. As shown in fig. 1, in the embodiment of the present application, the direction from the center of the watch dial to 3 o 'clock may be simply referred to as the 3 o' clock direction of the watch dial, the direction from the center of the watch dial to 6 o 'clock may be simply referred to as the 6 o' clock direction of the watch dial, and the direction from the center of the watch dial to 9 o 'clock may be simply referred to as the 9 o' clock direction of the watch dial.

The direction of 3 o ' clock of the watch dial is the direction facing the sky when the user wears the watch with the right hand and the right arm naturally sags to walk, the direction of 6 o ' clock of the watch dial is the direction facing the sky when the user wears the watch with the forearm horizontally swinging to run, and the direction of 9 o ' clock of the watch dial is the direction facing the sky when the user wears the watch with the left hand and the left arm naturally sags to walk.

It should be appreciated that the meaning of the estimated parameter representation in the above-described estimation scheme is very single and can only indicate the positioning performance of the positioning antenna in a certain specific direction. However, the positioning performance of the positioning antenna in a particular direction does not represent the overall performance of the positioning antenna. For example, when the positioning antenna is disposed on the wristwatch, the dial of the wristwatch faces the sky direction, and the positioning antenna is in an arm model scene close to the arm, the positioning antenna has a larger gain in the sky direction at 3 o' clock and cannot represent the positioning antenna to have a larger gain in the current posture (i.e. the posture of the dial of the wristwatch facing the sky direction), and the positioning antenna are not obviously connected. In addition, when the specific direction is blocked by an object with an electromagnetic shielding effect, the error of the positioning performance evaluation result of the positioning antenna is larger.

In order to solve the problems, the positioning performance evaluation method, the positioning performance evaluation device and the electronic equipment provided by the embodiment of the application can accurately and comprehensively evaluate the positioning performance of the positioning antenna, and the evaluation error is small.

In the embodiment of the application, the positioning antenna can be arranged in the electronic equipment, and the positioning performance evaluation method provided by the embodiment of the application can also be executed by the electronic equipment, such as GPS simulation software and the like in the electronic equipment. The electronic device may be a portable terminal with positioning and navigation functions, such as a mobile phone, a tablet computer, a wearable device (such as a smart watch), a vehicle-mounted device, a bracelet, a GPS Tag, a GPS platform, and the like. Exemplary embodiments of the portable terminal include, but are not limited to, piggy-back Or other operating system.

As an example, please refer to fig. 2, which is a schematic structural diagram of an electronic device according to an embodiment of the present application. The positioning performance evaluation method provided by the embodiment of the application can be applied to the electronic device 200 shown in fig. 2.

As shown in fig. 2, the electronic device 200 may include a processor 201, a display screen 203, a communication module 202, and the like.

The processor 201 may include one or more processing units, for example, the processor 201 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (IMAGE SIGNAL processor, ISP), a controller, a memory, a video streaming codec, a digital signal processor (DIGITAL SIGNAL processor, DSP), a baseband processor, and/or a neural network processor (neural-network processing unit, NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors 201.

In some embodiments, the processor 201 may include one or more interfaces. The interfaces may include an integrated circuit (inter-INTEGRATED CIRCUIT, I2C) interface, an integrated circuit built-in audio (inter-INTEGRATED CIRCUIT SOUND, I2S) interface, a pulse code modulation (pulse code modulation, PCM) interface, a universal asynchronous receiver transmitter (universal asynchronous receiver/transmitter, UART) interface, a mobile industry processor interface (mobile industry processor interface, MIPI), a general-purpose input/output (GPIO) interface, a subscriber identity module (subscriber identity module, SIM) interface, and/or a universal serial bus (universal serial bus, USB) interface, among others.

The electronic device 200 implements display functions through a GPU, a display screen 203, an application processor, and the like. The display screen 203 is used to display images, video streams, and the like.

The communication module 202 may include an antenna 1, an antenna 2, a mobile communication module 202A, and/or a wireless communication module 202B. Taking the communication module 202 as an example, the antenna 1, the antenna 2, the mobile communication module 202A and the wireless communication module 202B are included at the same time.

The wireless communication function of the electronic device 200 can be realized by the antenna 1, the antenna 2, the mobile communication module 202A, the wireless communication module 202B, a modem processor, a baseband processor, and the like.

The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in the electronic device 200 may be used to cover a single or multiple communication bands. Different antennas may also be multiplexed to improve the utilization of the antennas. For example, the antenna 1 may be multiplexed into a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 202A may provide a solution for wireless communication, including 2G/3G/4G/5G, applied on the electronic device 200. The mobile communication module 202A may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA), or the like. The mobile communication module 202A may receive electromagnetic waves from the antenna 1, perform processing such as filtering and amplifying the received electromagnetic waves, and transmit the processed electromagnetic waves to a modem processor for demodulation. The mobile communication module 202A may amplify the signal modulated by the modem processor, and convert the signal into electromagnetic waves through the antenna 1 to radiate the electromagnetic waves. In some embodiments, at least some of the functional modules of the mobile communication module 202A may be provided in the processor 201. In some embodiments, at least some of the functional modules of the mobile communication module 202A may be provided in the same device as at least some of the modules of the processor 201.

The wireless communication module 202B may provide solutions for wireless communication including wireless local area network (wireless local area networks, WLAN) (e.g., wireless fidelity (Wi-Fi) network), bluetooth (BT), global navigation satellite system (global navigation SATELLITE SYSTEM, GNSS), frequency modulation (frequency modulation, FM), near field communication (NEAR FIELD communication, NFC), infrared (IR), etc., applied to the electronic device 200. The wireless communication module 202B may be one or more devices that integrate at least one communication processing module. The wireless communication module 202B receives electromagnetic waves via the antenna 2, modulates the electromagnetic wave signals, filters the electromagnetic wave signals, and transmits the processed signals to the processor 201. The wireless communication module 202B may also receive a signal to be transmitted from the processor 201, frequency modulate it, amplify it, and convert it into electromagnetic waves to radiate through the antenna 2.

In some embodiments, antenna 1 and mobile communication module 202A of electronic device 200 are coupled, and antenna 2 and wireless communication module 202B are coupled, such that electronic device 200 may communicate with a network and other devices through wireless communication techniques. The wireless communication techniques can include the Global System for Mobile communications (global system for mobile communications, GSM), general packet radio service (GENERAL PACKET radio service, GPRS), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (wideband code division multiple access, WCDMA), time division code division multiple access (time-division code division multiple access, TD-SCDMA), long term evolution (long term evolution, LTE), BT, GNSS, WLAN, NFC, FM, and/or IR techniques, among others. The GNSS may include a global satellite positioning system (global positioning system, GPS), a global navigation satellite system (global navigation SATELLITE SYSTEM, GLONASS), a beidou satellite navigation system (beidou navigation SATELLITE SYSTEM, BDS), a quasi zenith satellite system (quasi-zenith SATELLITE SYSTEM, QZSS) and/or a satellite based augmentation system (SATELLITE BASED AUGMENTATION SYSTEMS, SBAS).

That is, the antenna 1 and/or the antenna 2 in fig. 2 may be positioning antennas in the embodiments of the present application. For example, the antenna 2 is coupled to the wireless communication module 302B, and performs functions such as positioning and navigation by communicating with any of the above-described GNSS systems.

As shown in fig. 2, in some implementations, the electronic device 200 may also include an internal memory 204. The internal memory 204 may be used to store computer executable program code including instructions. The processor 201 executes various functions or applications of the electronic device 200 by executing instructions stored in the internal memory 204.

The internal memory 204 may store one or more computer programs corresponding to the positioning performance evaluation method provided by the embodiment of the present application.

It should be understood that the structure illustrated in this embodiment does not constitute a specific limitation on the electronic device 200. In other embodiments, the electronic device 200 may include more or fewer components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

In order to facilitate an understanding of aspects of embodiments of the application, some concepts that may be referred to in the following description are presented.

As described in the foregoing embodiments, the satellite positioning system in the embodiments of the present application may be a global positioning system, a global navigation satellite system, a beidou satellite navigation system, a galileo satellite navigation system, a quasi-zenith satellite system, a satellite-based augmentation system, or the like, which is not limited herein.

Whichever satellite positioning system comprises a plurality of satellites orbiting the earth, known as positioning satellites. For any of the satellite positioning systems described above, at any time, any location above the surface of the earth may be required to include at least 3 satellites of the satellite positioning system for global positioning and navigation functions.

Taking a satellite positioning system as an example of a GPS, the GPS comprises 24 GPS positioning satellites rotating around the earth. The electronic equipment receives signals of at least 4 GPS positioning satellites through the positioning antenna, and can calculate the information such as the three-dimensional position, the three-dimensional direction, the movement speed, the relative relation between the three-dimensional position of the target site and the three-dimensional position of the electronic equipment.

In some possible implementations, the above-mentioned earth surface is above the ground level where any place is located, i.e. the side facing the sky. Referring to fig. 3, a schematic diagram of the earth's surface is provided in an embodiment of the present application. As shown in fig. 3, P is any point on the earth's surface, and Q and M are any two points off the surface. Wherein Q is located at one side of the ground plane where P is located towards the sky, M is not located at one side of the ground plane where P is located towards the sky, Q is located above P, and M is not located above P.

The concept of elevation angle is described below.

In the embodiment of the application, the included angle between the line of sight of the observer at the point P and the ground plane at the point P is called an elevation angle. Referring to fig. 4, a schematic diagram of the earth's surface is provided in accordance with an embodiment of the present application. As shown in fig. 4, the point P is any place on the earth's surface, the positioning satellite N is located above the point P, and the angle between the line of sight of the positioning satellite N (i.e., the line connecting the point P and the positioning satellite N) and the ground plane where the point P is located when the observer is located at the point P is a degrees, the elevation angle of the positioning satellite N with respect to the point P is a degrees, or the elevation angle direction of the positioning satellite N with respect to the point P is a degrees. Note that, in the case where the elevation angle of the positioning satellite N with respect to the point P is a degrees, the elevation angle of the positioning satellite N may be referred to as a degrees, if the point P is a known or default point.

In particular, according to the positioning performance evaluation method provided by the embodiment of the present application, since the method is used for evaluating the positioning performance of the positioning antenna, the position where the positioning antenna or the electronic device provided with the positioning antenna is located is used as a default location in the subsequent description of the embodiment of the present application. Thus, in the embodiment of the present application, the elevation angle of the positioning satellite refers to the elevation angle of the positioning satellite relative to the positioning antenna or the electronic device provided with the positioning antenna, and the elevation direction of the electronic device or the positioning antenna at a certain angle (a degrees as described above) refers to the direction in which the included angle with the ground plane of the location where the electronic device or the positioning antenna is located is the angle (a degrees as described above).

It will be appreciated that since the ground plane is a plane, the electronic device may enclose a cone region above a certain elevation angle, which may be referred to as above the angular elevation angle of the electronic device. Taking the point P of fig. 4 as an example, the elevation angle of the positioning antenna above a degrees of the point P is referred to as the conical area shown in fig. 4.

In practical applications, the positioning antenna is usually disposed in an electronic device. While objects, such as high buildings, that block electromagnetic signals may be present around the electronic device. These objects that block electromagnetic signals may weaken the signals of some positioning satellites that are located above the electronic device and at low elevation angles, so that the communication quality between these positioning satellites at low elevation angles and the electronic device is poor, and the positioning and navigation operations cannot be performed normally. Thus, satellite positioning systems are generally satisfied in that, at any time, the earth's surface includes more than 4 positioning satellites of the satellite positioning system above any point and distributed over different elevation angles.

It should be understood that, because the rotation data of the earth are known, the trajectory data of the positioning satellites in the satellite positioning system are known, so that if a specific position (such as longitude, latitude and altitude) of any point P and any time t are determined, the number of positioning satellites above the point P and the elevation angle of each positioning satellite at the time t can be calculated. The method for calculating the number of positioning satellites above the time t and the place P according to the trajectory data of the positioning satellites in the satellite positioning system based on the rotation data of the earth can refer to the description in the related art. In the embodiment of the present application, the number of positioning satellites and the elevation angles of the positioning satellites above the time t and the place P can be obtained through calculation, or the number of positioning satellites and the elevation angles of the positioning satellites above the time t and the place P can be directly obtained through a trusted data source, which is not described herein.

For the positioning antenna which realizes positioning by receiving the signal of a certain satellite positioning system G, the positioning performance of the positioning antenna can be characterized by the number of the positioning satellites in the G which can be tracked and captured by the positioning antenna above a certain elevation angle, and can be characterized by the carrier-to-noise ratio when the signal of the positioning satellite in the G is transmitted to the positioning antenna. Specifically, under the condition that other conditions are certain, the more the positioning antenna can track the number of the positioning satellites in the captured G above the first elevation angle, the better the positioning performance, and the greater the carrier-to-noise ratio of the signals of the positioning satellites in the G when the signals are transmitted to the positioning antenna, the better the positioning performance of the positioning antenna.

In order to comprehensively evaluate the positioning performance of the positioning antenna, the embodiment of the application comprehensively considers the number of the positioning satellites which can be tracked and captured by the positioning antenna above a certain elevation angle and the carrier-to-noise ratio of the signals of the positioning satellites when the signals are transmitted to the positioning antenna, combines the two aspects as evaluation parameters to evaluate the positioning performance of the positioning antenna, and is specifically described below.

It should be noted that, the positioning performance evaluation method provided by the embodiment of the present application is applied to an electronic device, where a positioning antenna may be set in the electronic device, or the positioning antenna may not be set in the electronic device. The positioning antenna evaluated in the positioning performance evaluation method may be the positioning antenna in the electronic device to which the above method is applied, or may be the positioning antenna in other electronic devices, which is not particularly limited in the present application.

For example, in the electronic device a for executing the positioning performance evaluation method provided by the embodiment of the present application, the positioning antenna may be set, or the positioning antenna may not be set. The positioning performance evaluation method executed by the electronic equipment A can be used for evaluating the positioning performance of the positioning antenna in the electronic equipment A and also can be used for evaluating the positioning performance of the positioning antenna in other electronic equipment.

In addition, the positioning antenna evaluation method provided by the embodiment of the application also considers the evaluation scene and limits the evaluation result under the corresponding evaluation scene, so that the evaluation result can be more specific and accurate. Wherein the evaluation scene may include an evaluation elevation angle indicating an angle range, a pose of the positioning antenna, a position of the positioning antenna, and the like. The estimated elevation angle is used to indicate a defined angular range, which may also be referred to as a preset elevation angle in embodiments of the present application, when determining the number of positioning satellites that the positioning antenna is capable of tracking the acquisition.

Since the positioning antenna is generally disposed in the electronic device in practical application, in the embodiment of the present application, the posture of the positioning antenna may be represented by the posture of the electronic device in which the positioning antenna is located, or the posture of the positioning antenna may be equal to the posture of the corresponding electronic device. For example, the electronic device where the positioning antenna is located is a wristwatch, and the gesture of the positioning antenna may include a direction in which the dial of the wristwatch faces the sky in the foregoing embodiment, a direction in which the 3 o ' clock direction of the dial of the wristwatch faces the sky, a direction in which the 6 o ' clock direction of the dial of the wristwatch faces the sky, a direction in which the 9 o ' clock direction of the dial of the wristwatch faces the sky, and so on. The positioning antenna is disposed in other electronic devices in the same manner, and will not be described herein.

Similarly, the location of the positioning antenna may be equivalent to the location of the corresponding electronic device. For example, when the estimated elevation angle is 30 °, the position of the positioning antenna is W, and the posture of the positioning antenna is Q, the estimated result obtained by estimating the positioning performance of the positioning antenna is that the positioning antenna is positioned at the position W, and when the positioning antenna is at the posture Q, the positioning performance is above the elevation angle of 30 °.

Referring to fig. 5, a flowchart of a positioning performance evaluation method according to an embodiment of the present application is shown. As shown in fig. 5, the method may include the following steps.

S501, gain of the positioning antenna in each direction interval above the estimated elevation angle and satellite number density corresponding to each direction interval are obtained.

The following describes the estimated elevation angle in the embodiment of the present application.

As described above, the estimated elevation angle is used to indicate a defined angular range when determining the number of positioning satellites that the positioning antenna is capable of tracking acquisition. The embodiment of the application evaluates the positioning performance of the positioning antenna based on the number of the positioning satellites which can be tracked and captured by the positioning antenna above the evaluation elevation angle and the signal quality of the positioning satellites which are received by the positioning antenna above the evaluation elevation angle.

In some possible implementations, evaluating elevation angle may be entered by a user. In other possible implementations, the estimated elevation angle is measured by the electronic device. For example, the electronic device may measure the maximum elevation angle of the shielding around the positioning antenna relative to the positioning antenna through electromagnetic wave detection, image detection and other related technologies, that is, the elevation angle of the vertex of the shielding around the positioning antenna relative to the positioning antenna. Wherein the shade can be a building, tree, etc. The shielding objects around the positioning antenna refer to shielding objects within a preset distance from the positioning antenna. In the embodiment of the application, the periphery of the positioning antenna can be replaced by the periphery of the electronic equipment provided with the positioning antenna, and the description is omitted.

For example, please refer to fig. 6, which is a schematic diagram of an obstruction according to an embodiment of the present application. As shown in fig. 6, when the user wears the electronic device provided with the positioning antenna and walks on a road with high buildings on both sides, if the maximum elevation angle of the high building relative to the positioning antenna in the electronic device is θ degrees, the estimated elevation angle can be determined as θ degrees.

It should be appreciated that where the elevation angles of the shade vertices around the positioning antenna are all different, the estimated elevation angle may comprise a plurality of different horizontal elevation angles, each for indicating the elevation angle of a different horizontal shade vertex. Above elevation, i.e. above elevation of the plurality of different horizontal directions, is evaluated. For convenience of explanation, in the following embodiments, the case where the estimated elevation angle is one elevation angle is taken as an example for explanation, and no description is repeated.

The gain of the antenna is described below.

The antenna gain is defined as the ratio of the power densities of signals produced by the actual antenna and the ideal radiating element at the same point in space, with equal input power. Antenna gain, which quantitatively describes the extent to which an antenna radiates concentrated output power, can be used to measure the ability of an antenna to transmit and receive signals in a particular direction.

The gain profile of the antenna in each direction may be determined from the antenna pattern as shown in fig. 7. As shown in fig. 7, in the antenna pattern, a region with a larger gray represents a higher gain of the antenna, and a region with a smaller gray represents a lower gain of the antenna. The antenna pattern can be obtained by calculating the shape, feeding and other hardware parameters of the antenna or by simulation experiments. Therefore, it can be considered that the gains of the antenna at different positions in each direction can be calculated according to the hardware parameters of the antenna or obtained through simulation experiments.

In some possible implementations, the gain profile of the positioning antenna in various directions may be pre-stored in the electronic device in which the positioning antenna is provided. The electronic device executing the positioning performance evaluation method acquires gain distribution of the positioning antenna in each direction by communicating with the electronic device provided with the positioning antenna.

In other possible implementations, the gain profile of the positioning antenna in each direction may be pre-stored or transmitted to the electronic device performing the positioning performance evaluation method.

The concept of the directional section is described here.

Fig. 8 is a schematic diagram of a spherical coordinate system according to an embodiment of the application. As shown in fig. 8, in the spherical coordinate system with O as the origin, a point a in space can be uniquely determined by the angle phi between OA and the x-axis, the angle theta between OA and the z-axis, and the length of OA. While either direction in space may be uniquely determined by phi and theta.

The rotation direction from the positive x-axis rotation to the positive y-axis rotation is defined as the phi-axis, or azimuth axis, and the direction from the positive z-axis rotation to the xoy-plane is defined as the theta-axis, or elevation axis. And dividing the phi axis by taking a first preset angle value (such as 3 DEG) as a step length, and dividing the theta axis by taking a second preset angle value as a step length, so that all directions in the space can be divided into a plurality of direction sections. The first preset angle value and the second preset angle value may be the same or different.

It should be understood that the direction interval indicates a range of angles. In the embodiment of the application, the direction interval is based on a spherical coordinate system taking the positioning antenna as the center of sphere. Therefore, in a spherical coordinate system with the positioning antenna as a center, the directional sections form the same angle with the center. That is, each direction section corresponds to the same angle value in the azimuth axis direction of the spherical coordinate system, and corresponds to the same angle value in the elevation axis direction of the spherical coordinate system.

For example, please refer to fig. 9, the corresponding region of each direction section on the sphere is shown in fig. 9. It can be seen that the areas corresponding to the direction intervals may be the same or different in the spherical surface.

In some possible implementations, the gain distribution of the positioning antenna in each direction above the estimated elevation angle can be obtained by the directional diagram of the positioning antenna shown in fig. 7, so that the gain of the positioning antenna in a certain direction interval can be obtained by averaging the gains of the positioning antenna in each direction in the direction interval.

In other possible implementations, since the direction interval is generally smaller, the gain distribution in each direction in the direction interval is more uniform, and therefore, the gain in any direction in the direction interval can be randomly selected as the gain of the positioning antenna in the direction interval.

The concept of satellite number density is described below.

The satellite number density corresponding to the direction interval is used for indicating the sum of probabilities of each positioning satellite in the satellite positioning system in the direction interval. For example, a satellite positioning system includes positioning satellites S1, S2, S3. Wherein, the probability of S1 appearing in the direction interval is 0.4, the probability of S2 appearing in the direction interval is 0.3, and the probability of S3 appearing in the direction interval is 0.5, the satellite number density corresponding to the direction interval is 1.2. It will be appreciated that the greater the number density of satellites corresponding to a directional interval, the greater the number of positioning satellites that the positioning antenna is able to track acquisition in that directional interval.

One possible implementation is given below for determining the probability that a positioning satellite is present in a directional interval.

As described in the foregoing embodiment, if a specific position (such as longitude, latitude and altitude) of any location P and any time t are determined, the number of positioning satellites above the location P and the elevation angle of each positioning satellite at the time t can be known.

First, in one earth-surrounding period of the positioning satellites, the sum of the probabilities of each positioning satellite appearing in each elevation angle interval is determined according to the time length of each positioning satellite appearing in each elevation angle interval. The elevation angle section refers to a section formed by sections with the same direction of elevation angle.

Taking any elevation angle interval of the positioning antenna, such as a reference elevation angle interval as an example, in one ground-surrounding period of the positioning satellite, the ratio of the total time length of each positioning satellite in the reference elevation angle interval to the ground-surrounding period is the sum of the probabilities of each positioning satellite in the reference elevation angle interval.

The sum of probabilities of occurrence of positioning satellites in the reference elevation interval may also be referred to as the satellite number density in the reference elevation interval, and may be displayed or stored in the form of a graph. For example, please refer to fig. 10, which is a schematic diagram of satellite number density of positioning satellites in each elevation interval according to an embodiment of the present application. As shown in fig. 10, curve 1 is a satellite number density curve in different elevation angle sections of the location X, and curve 2 is a satellite number density curve in different elevation angle sections of the location Y. Wherein the numbers in the horizontal axis identify the codes of different elevation intervals, and do not refer to actual elevation interval values. As can be seen from fig. 10, the satellite number density in each elevation interval can be represented in a graph form, and the satellite number density is highly probable to be different in the same elevation interval at different points.

After determining the satellite number density in each elevation angle section by the above embodiment, the satellite number density corresponding to the direction section may be determined according to the angle value corresponding to the direction section in the azimuth axis direction of the spherical coordinate system. For example, the angle value corresponding to the azimuth axis direction of the spherical coordinate system in the direction section is 3 °, and the angle value corresponding to the azimuth axis direction of the spherical coordinate system in the elevation section in which the direction section is located is 360 °, and therefore the product of the satellite number density corresponding to the elevation section in which the direction section is located and 3/360 may be used as the satellite number density corresponding to the direction section.

Similarly, the satellite number density corresponding to each direction section may also be determined based on the first ratio value of each direction section. The first ratio is a ratio of a spherical surface area corresponding to a direction section and a spherical surface area corresponding to an elevation section where the direction section is located in a spherical surface with the positioning antenna as a spherical center. It should be understood that the product of the first ratio and the satellite number density corresponding to the elevation angle interval in which the direction interval is located is the satellite number density corresponding to the direction interval.

It should be noted that the satellite number density is a sum of probabilities, and thus may be a decimal fraction or greater than 1, and will not be described in detail herein.

Since the satellite number density corresponding to each directional section is also determined in the case of the position determination of the positioning antenna. Therefore, in the embodiment of the application, the mapping relation between each position information and the satellite number density corresponding to each direction interval can be stored in advance. In this way, the satellite number density corresponding to each direction section can be obtained directly from the stored mapping relation without calculation when executing S501. In the embodiment of the application, the data such as the satellite number density corresponding to each direction interval of the positioning antenna, which is higher than the estimated elevation angle, can be collectively referred to as the test data of the positioning antenna. On this basis, S501 may also be referred to as the test data for the positioning antenna. Then, in order to facilitate the subsequent calculation, the electronic device may determine whether the data such as the satellite number density corresponding to each direction interval in the test data is in the form of spherical coordinates and whether the step length of the direction interval is a preset step length (e.g. 3 °), if so, S502 is executed, and if the step length of the direction interval is the preset step length, the gain of the positioning antenna in each direction interval above the estimated elevation angle or the data such as the satellite number density corresponding to each direction interval is not in the form of spherical coordinates, and then S502 may be executed after the data is converted into the form of spherical coordinates. If the step length of the direction interval is not the preset step length, stopping executing.

In addition, when each direction section is represented in the test data of the positioning antenna, a default coordinate system is required. In the default coordinate system, the pose of the positioning antenna may not be the same as the first pose, so when S501 is executed, the coordinate system may be first used to convert the pose of the positioning antenna in the default coordinate system to the first pose, and the directional diagram of the positioning antenna in the first pose is calculated according to the directional diagram of the positioning antenna in the default coordinate system and the two-dimensional interpolation method, so as to obtain the gain of each directional interval.

S502, according to the gains of the positioning antenna in each direction interval, determining the carrier-to-noise ratio corresponding to each direction interval.

It should be noted that, because parameters such as the transmitting power of the positioning satellite are unknown, the carrier-to-noise ratio of the signal of the positioning satellite in each direction interval cannot be accurately calculated, and the carrier-to-noise ratio corresponding to each direction interval determined by S502 can only represent the actual carrier-to-noise ratio corresponding to each direction interval within a range allowed by a certain error. The carrier-to-noise ratio corresponding to the direction interval is the carrier-to-noise ratio of the signal of the designated satellite in the direction interval.

In the embodiment of the present application, the estimated value CN0 of the carrier-to-noise ratio corresponding to each direction interval may be determined by the following formula (1):

Cn0=SR+GA-lg (kT ₀) -NF-L equation (1).

Wherein SR is the power of satellite signals reaching the ground, GA is the gain of a positioning antenna, k is the Boltzmann constant, T ₀ is the reference temperature of thermal noise, NF is the noise coefficient of the radio frequency front end, and L is the quantization loss of the radio frequency front end. Wherein the difference between the SR, k,

T ₀, NF, L are all pre-configured parameters, which may be referred to as preset parameters. The preset parameters may be pre-stored in the electronic device for direct use by the electronic device in the calculation.

In the embodiment of the present application, in order to facilitate subsequent calculation, the estimated value of the carrier-to-noise ratio corresponding to each direction interval determined by the above formula (1) may be rounded, for example, rounded to an integer. For example, the estimated value of the carrier-to-noise ratio corresponding to a certain direction interval is determined to be 22.6 by the above formula (1), and is rounded to be 23 by rounding. That is, the carrier-to-noise ratio of the signal of the positioning satellite in this direction interval can be regarded as 23.

In other alternative implementations, the estimated carrier-to-noise ratio value corresponding to each direction interval determined by the above formula (1) may also be used as the carrier-to-noise ratio corresponding to each direction interval.

S503, estimating the positioning performance of the positioning antenna in a reference scene by taking the satellite number density corresponding to each carrier-to-noise ratio as an estimation parameter.

The satellite number density corresponding to the carrier-to-noise ratio refers to the sum of satellite number densities of the direction interval in which the corresponding carrier-to-noise ratio is greater than or equal to the carrier-to-noise ratio. The positioning performance of the positioning antenna is positively correlated with the evaluation parameter.

For example, the direction intervals above the estimated elevation angle include a direction interval a, a direction interval b, a direction interval c, a direction interval d, and a direction interval e. The satellite number density corresponding to the direction interval a is 1.1, the corresponding carrier-to-noise ratio is 23, the satellite number density corresponding to the direction interval b is 1.2, the corresponding carrier-to-noise ratio is 21, the satellite number density corresponding to the direction interval c is 1.5, the corresponding carrier-to-noise ratio is 25, the satellite number density corresponding to the direction interval d is 1.3, the corresponding carrier-to-noise ratio is 25, and the satellite number density corresponding to the direction interval e is 1.4, and the corresponding carrier-to-noise ratio is 23.

In some possible implementations, the corresponding direction intervals with a carrier-to-noise ratio greater than or equal to 21 include a direction interval a, a direction interval b, a direction interval c, a direction interval d, and a direction interval e, the corresponding direction intervals with a carrier-to-noise ratio greater than or equal to 23 include a direction interval a, a direction interval c, a direction interval d, and a direction interval e, and the corresponding direction intervals with a carrier-to-noise ratio greater than or equal to 25 include a direction interval c and a direction interval d.

It can be seen that the sum of the satellite number densities of the direction intervals corresponding to the carrier-to-noise ratio greater than or equal to 21, namely the satellite number density corresponding to the carrier-to-noise ratio 21 is 6.5, the satellite number density corresponding to the carrier-to-noise ratio 23 is 2.5, and the satellite number density corresponding to the carrier-to-noise ratio 25 is 2.7.

In the embodiment of the application, the satellite number density corresponding to the carrier-to-noise ratio is used as an evaluation parameter for evaluating the positioning performance. For example, for two positioning antennas in the same position and in the same posture, the greater the number density of satellites corresponding to the same carrier-to-noise ratio, the better the positioning performance, and the lesser the number density of satellites corresponding to the same carrier-to-noise ratio, the worse the positioning performance, under other conditions. For another example, for the same positioning antenna in the same posture and different positions, under the condition of the same other conditions, the greater the number density of satellites corresponding to the same carrier-to-noise ratio is, the better the positioning performance of the positioning antenna in the position is, and the smaller the number density of satellites corresponding to the same carrier-to-noise ratio is, the poorer the positioning performance of the positioning antenna in the position is. The other conditions mentioned above refer to the satellite number density corresponding to the other carrier-to-noise ratios in addition to the compared carrier-to-noise ratios.

It should be understood that, for two positioning antennas (such as the antenna 1 and the antenna 2) in the same position and the same posture, for the satellite number density corresponding to each carrier-to-noise ratio, if the antenna 1 is larger than the antenna 2, the positioning performance of the antenna 1 in the position and the posture is considered to be better than that of the antenna 2, if the antenna 1 is smaller than the antenna 2, the positioning performance of the antenna 1 in the position and the posture is considered to be worse than that of the antenna 2, and if the antenna 1 and the antenna 2 have the same size, the positioning performance of the antenna 1 and the antenna 2 have advantages and disadvantages in different application scenarios, and specific evaluation is required in combination with the application scenarios.

In other possible implementations, the carrier-to-noise ratio for each directional interval includes n, n+1, n+2, n+3, n+4. The positioning performance of the positioning antenna can be represented and evaluated through a relation curve between the satellite number density corresponding to each carrier-to-noise ratio and each carrier-to-noise ratio. For convenience of explanation, the posture of the positioning antenna, or the posture of the electronic device provided with the positioning antenna, will be referred to as a first posture in the following examples.

For example, when the estimated elevation angle is 30 °, the positioning antenna is disposed in the watch, the first gesture is the direction of the dial facing the sky, the 3 o ' clock direction facing the sky, the 6 o ' clock direction facing the sky, and the 9 o ' clock direction facing the sky, and the positioning antenna is at the first position and the second position, a schematic diagram of a relationship between the number density of satellites and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio may be shown in fig. 11.

Referring to fig. 11, a schematic diagram of a relationship between satellite number density and carrier-to-noise ratio corresponding to each carrier-to-noise ratio in different first poses and different positions according to an embodiment of the present application is provided.

As shown in fig. 11, when the first gesture is the direction of the dial facing the sky, curve 3 is a graph of the relationship between the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is at the first position, and curve 4 is a graph of the relationship between the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is at the second position. It can be seen that when the estimated elevation angle is 30 °, the positioning antenna is arranged in the watch, and the first gesture is the direction of the dial plate facing the sky, the positioning performance of the positioning antenna at the first position and the positioning performance at the second position are good or bad in different application scenes. For example, for an application scenario where CN0 is greater than or equal to n and less than or equal to n+2, the positioning performance of the positioning antenna at the first location is better than the positioning performance at the second location, while for an application scenario where CN0 is greater than or equal to n+3 and less than or equal to n+4, the positioning performance of the positioning antenna at the first location is inferior to the positioning performance at the second location.

When the first gesture is in the direction of 3 o' clock and faces the sky, curve 5 is a graph of the relationship between the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is in the first position, and curve 6 is a graph of the relationship between the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is in the second position. It can be seen that when the estimated elevation angle is 30 °, and the positioning antenna is disposed in the wristwatch with the first posture being the direction of 3 o' clock toward the sky, the positioning performance of the positioning antenna in the first position is better than that in the second position.

When the first gesture is 6 o' clock direction towards sky, curve 7 is the relation curve diagram of satellite number density and carrier-to-noise ratio that each carrier-to-noise ratio corresponds when the positioning antenna is in the first position, and curve 8 is the relation curve diagram of satellite number density and carrier-to-noise ratio that each carrier-to-noise ratio corresponds when the positioning antenna is in the second position. It can be seen that when the positioning antenna is disposed in the wristwatch with the estimated elevation angle being 30 deg., the first attitude is 6 o' clock oriented toward the sky, the positioning performance of the positioning antenna in the first position is inferior to that in the second position.

When the first gesture is 9 o' clock direction towards sky, curve 9 is the relation curve diagram of satellite number density and carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is in the first position, and curve 10 is the relation curve diagram of satellite number density and carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is in the second position. It can be seen that when the estimated elevation angle is 30 °, and the positioning antenna is disposed in the wristwatch, and the first posture is the direction of 9 o' clock toward the sky, the positioning performance of the positioning antenna at the first position and the positioning performance at the second position are good or bad in different application scenarios. For example, for an application scenario where CN0 is greater than or equal to n and less than or equal to n+2, the positioning performance of the positioning antenna at the first location is inferior to the positioning performance at the second location, whereas for an application scenario where CN0 is greater than or equal to n+3 and less than or equal to n+4, the positioning performance of the positioning antenna at the first location is superior to the positioning performance at the second location.

In the example shown in fig. 11, the curves 3 and 4 indicate that the positioning antenna is in the same pose, but the relationship curves between the satellite number density and the carrier-to-noise ratio corresponding to the carrier-to-noise ratios at different positions are used to evaluate the positioning performance of the same positioning antenna at the same pose and at different positions. Alternatively, the curves 3 and 4 may also indicate the relationship curves of the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when different positioning antennas are in the same pose and in the same position, so as to evaluate the positioning performance of different positioning antennas in the same pose and in the same position, and the evaluation method is similar to the evaluation method corresponding to fig. 11, and will not be repeated herein. Curve 5 and curve 6, curve 7 and curve 8, curve 9 and curve 10 are the same.

In other possible implementations, the elevation angle is estimated to be 60 °, the positioning antenna is disposed in the watch, the first gesture is a direction in which the dial faces the sky, the 3 o ' clock direction faces the sky, the 6 o ' clock direction faces the sky, the 9 o ' clock direction faces the sky, and when the positioning antenna is in the first position and the second position, a graph of a relationship between a satellite number density and a carrier-to-noise ratio corresponding to each carrier-to-noise ratio may be shown in fig. 12.

Referring to fig. 12, a schematic diagram of a relationship between a satellite number density and a carrier-to-noise ratio corresponding to each carrier-to-noise ratio in different first poses and different positions according to an embodiment of the present application is provided.

As shown in fig. 12, when the first gesture is the direction of the dial facing the sky, the curve 11 is a schematic diagram of the relationship between the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is at the first position, and the curve 12 is a schematic diagram of the relationship between the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is at the second position. It can be seen that when the estimated elevation angle is 60 °, the positioning antenna is arranged in the watch, and the first gesture is the direction of the dial plate facing the sky, the positioning performance of the positioning antenna at the first position and the positioning performance at the second position are good or bad in different application scenes. For example, for an application scenario where CN0 is greater than or equal to n and less than or equal to n+2, the positioning performance of the positioning antenna at the first location is better than the positioning performance at the second location, while for an application scenario where CN0 is greater than or equal to n+3 and less than or equal to n+4, the positioning performance of the positioning antenna at the first location is inferior to the positioning performance at the second location.

When the first gesture is in the direction of 3 o' clock and faces the sky, curve 13 is a graph of the relationship between the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is in the first position, and curve 14 is a graph of the relationship between the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is in the second position. It can be seen that when the estimated elevation angle is 30 °, and the positioning antenna is disposed in the wristwatch with the first posture being the direction of 3 o' clock toward the sky, the positioning performance of the positioning antenna in the first position is better than that in the second position.

When the first gesture is 6 o' clock direction towards sky, curve 15 is a graph of the relationship between the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is at the first position, and curve 16 is a graph of the relationship between the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is at the second position. It can be seen that when the estimated elevation angle is 60 °, and the positioning antenna is disposed in the wristwatch with the first posture being 6 o' clock oriented toward the sky, the positioning performance of the positioning antenna in the first position is better than that in the second position.

When the first gesture is 9 o' clock and faces the sky, curve 17 is a graph of the relationship between the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is at the first position, and curve 18 is a graph of the relationship between the satellite number density and the carrier-to-noise ratio corresponding to each carrier-to-noise ratio when the positioning antenna is at the second position. It can be seen that when the estimated elevation angle is 60 °, and the positioning antenna is disposed in the wristwatch with the first posture being the direction of 9 o' clock toward the sky, the positioning performance of the positioning antenna in the first position is better than that in the second position.

Based on the above description, it can be seen that the positioning performance evaluation method provided by the embodiment of the application can combine the number of the captured positioning satellites which can be tracked above a certain elevation angle of the positioning antenna and the carrier-to-noise ratio of the positioning satellite signals received by the positioning antenna as evaluation parameters, comprehensively evaluate the positioning performance of the positioning antenna, and has more comprehensive and accurate evaluation results.

In the embodiment of the application, the positioning performance of the positioning antenna can be estimated through the average gain of the positioning antenna above a certain elevation angle. Similar to the positioning performance evaluation method shown in fig. 5 described above, the positioning performance evaluation method based on the average gain is also combined with an evaluation scenario (may also be referred to as a reference scenario in the embodiment of the present application). The description of the evaluation scenario or the reference scenario may be referred to the foregoing embodiments, and will not be described herein.

Referring to fig. 13, a flowchart of another positioning performance evaluation method according to an embodiment of the present application is shown. As shown in fig. 13, the method includes the following steps.

S1301, gain of the positioning antenna in each direction section above the estimated elevation angle is obtained.

For the process of estimating the elevation angle, the direction interval, the antenna gain, and the gain of the positioning antenna in each direction interval above the estimated elevation angle, reference is made to the description in the foregoing embodiments, and details are not repeated here.

S1302, taking the gain average value of each direction interval as an evaluation parameter, and evaluating the positioning performance of the positioning antenna.

It should be appreciated that the positioning performance of the positioning antenna is positively correlated with the evaluation parameter. For example, if the other conditions are the same, the larger the gain average value of each direction interval is, the better the positioning performance of the positioning antenna is, and the smaller the gain average value of each direction interval is, the worse the positioning performance of the positioning antenna is. Other conditions may be referred to as the above-described evaluation scenario or reference scenario, among others. In some possible implementations, other conditions may also include the average of the efficiency of the antenna above the estimated elevation angle.

For example, when the GPS positioning antenna is disposed in a wristwatch, the user wears the wristwatch (i.e., in an arm model scenario) with an estimated elevation angle of 30 °, the first gestures are the directions of the dial facing the sky, the 3 o ' clock direction facing the sky, the 6 o ' clock direction facing the sky, and the 9 o ' clock direction facing the sky, respectively, the first positioning antenna and the second positioning antenna are at 30 °

The gain average and the efficiency average for each directional interval above elevation angle can be shown in table 1 below.

TABLE 1

In table 1, when a1 is equal to b1, if a2 is greater than b2, it is indicated that the positioning performance of the first positioning antenna is better than that of the second positioning antenna in the arm mode scene in the direction of the dial facing the sky over the 30 ° elevation angle. The same applies to the scene where a3 is greater than b3, a4 is greater than b4, and a5 is greater than b5, and vice versa, and no description is given here.

Compared with the scheme of only evaluating the positioning performance through efficiency, the method for evaluating the positioning performance is more comprehensive and accurate. For example, in table 1, if a1 is smaller than b1, a2 is larger than b2, and the difference between b1 and a1 is smaller than or far smaller than the difference between a2 and b2, it is indicated that the first gesture is the direction of the dial facing the sky above 30 ° elevation angle, and the efficiency of the first positioning antenna is slightly lower than that of the second positioning antenna in the arm mode scene, but the gain average value of the first positioning antenna is larger than or far larger than that of the second positioning antenna, so the positioning performance of the first positioning antenna in the scene can be considered to be better than that of the second positioning antenna. The same applies to the scene where a3 is greater than b3, a4 is greater than b4, and a5 is greater than b5, and vice versa, and no description is given here.

The positioning performance of the different positioning antennas can also be represented or evaluated by a table similar to the table 1 above when the elevation angle is estimated to be 60 °, and a detailed description is omitted herein.

It can be seen that, according to the method for evaluating positioning performance provided by the embodiment of the application, the positioning performance of the positioning antenna is evaluated through the gain mean value of the positioning antenna with more than one elevation angle, and all directions with more than one elevation angle are considered, so that the evaluation result is comprehensive and accurate.

Embodiments of the present application also provide a computer storage medium having stored therein computer instructions which, when executed on an electronic device, cause the electronic device to perform the above-described related method steps to implement the method in the above-described embodiments.

The embodiments of the present application also provide a computer program product which, when run on a computer, causes the computer to perform the above-mentioned related steps to implement the method in the above-mentioned embodiments.

In addition, the embodiment of the application also provides a device, which can be a chip, a component or a module, and the device can comprise a processor and a memory which are connected, wherein the memory is used for storing computer execution instructions, and when the device runs, the processor can execute the computer execution instructions stored in the memory so that the chip can execute the method in the method embodiments. It should be noted that, all relevant contents of each step related to the above method embodiment may be cited to the functional description of the corresponding functional module, which is not described herein.

The electronic device, the computer storage medium, the computer program product, or the chip provided by the embodiments of the present application are used to execute the corresponding methods provided above, so that the beneficial effects thereof can be referred to the beneficial effects in the corresponding methods provided above, and will not be described herein.

The scheme provided by the embodiment of the application is mainly described from the perspective of the electronic equipment. To achieve the above functions, it includes corresponding hardware structures and/or software modules that perform the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The embodiment of the application can divide the functional modules of the devices involved in the method according to the method example, for example, each functional module can be divided corresponding to each function, and two or more functions can be integrated in one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.

The functions or acts or operations or steps and the like in the embodiments described above may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more servers, data centers, etc. that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), etc.

Although the application has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are merely exemplary illustrations of the present application as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the application. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (9)

1. The positioning performance evaluation method is characterized by being applied to the electronic equipment, and comprises the following steps:

The method comprises the steps of obtaining the gain of a positioning antenna in each direction interval above a preset elevation angle and the satellite number density corresponding to each direction interval, wherein in a spherical coordinate system taking the positioning antenna as a sphere center, the each direction interval and the sphere center form the same angle;

The method comprises the steps of acquiring satellite quantity densities corresponding to all the direction intervals, determining total duration corresponding to all the elevation intervals according to the position information of a positioning antenna, wherein each elevation interval consists of direction intervals with the same elevation angle, the total duration corresponding to the elevation intervals refers to the total duration of all the positioning satellites appearing in the elevation intervals in one earth winding period of the positioning satellites, respectively calculating the ratio of the total duration corresponding to all the elevation intervals to the earth winding period to obtain satellite quantity densities corresponding to all the elevation intervals, and determining the satellite quantity densities corresponding to all the direction intervals according to the satellite quantity densities corresponding to all the elevation intervals and the angle values corresponding to all the direction intervals in the azimuth axial direction of a spherical coordinate system;

determining the carrier-to-noise ratio corresponding to each direction interval according to the gain of the positioning antenna in each direction interval, wherein the carrier-to-noise ratio corresponding to one direction interval refers to the carrier-to-noise ratio of the signal of each positioning satellite in the one direction interval;

And evaluating the positioning performance of the positioning antenna by taking the satellite number density corresponding to each carrier-to-noise ratio as an evaluation parameter, wherein the satellite number density corresponding to one carrier-to-noise ratio is the sum of the satellite number densities of the target direction interval corresponding to the one carrier-to-noise ratio, the target direction interval is the direction interval with the carrier-to-noise ratio being greater than or equal to the one carrier-to-noise ratio, and the positioning performance of the positioning antenna is positively correlated with the evaluation parameter.

2. The method of claim 1, wherein obtaining the gain of the positioning antenna in each direction interval above a preset elevation angle comprises:

acquiring a directional diagram of the positioning antenna;

According to the directional diagram of the positioning antenna, determining gain distribution of the positioning antenna in each direction above the preset elevation angle;

And determining the gain of the positioning antenna in each direction interval according to the gain distribution of the positioning antenna in each direction, wherein the gain of the positioning antenna in one direction interval is positively correlated with the gain distribution in each direction in the one direction interval.

3. The method of claim 2, wherein said determining the gain of the positioning antenna in the respective direction interval based on the gain profile of the positioning antenna in the respective direction comprises:

calculating the gain average value of the positioning antenna in each direction in the direction interval, and taking the gain average value as the gain of the positioning antenna in the direction interval;

or, randomly selecting the gain of any direction in the direction interval as the gain of the positioning antenna in the direction interval.

4. A method according to any one of claims 1-3, wherein the obtaining the gain of the positioning antenna in each direction interval above a preset elevation angle is preceded by:

determining the preset elevation angle according to user input, or,

Detecting a shielding object within a preset distance, and determining the preset elevation angle according to the maximum elevation angle of the shielding object.

5. A method according to any one of claims 1-3, wherein said determining the carrier-to-noise ratio corresponding to each direction interval according to the gain of the positioning antenna in each direction interval comprises:

Determining a carrier-to-noise ratio estimated value corresponding to each direction interval according to preset parameters and the gain of the positioning antenna in each direction interval, wherein the preset parameters comprise the power of a signal of the positioning satellite reaching the ground, a Boltzmann constant, a reference temperature of thermal noise, a noise coefficient of a radio frequency front end and the quantization loss of the radio frequency front end;

and rounding the carrier-to-noise ratio estimated values corresponding to the direction intervals respectively to obtain the carrier-to-noise ratios corresponding to the direction intervals.

6. A method according to any one of claims 1-3, wherein after determining the carrier-to-noise ratio corresponding to each direction interval according to the gain of the positioning antenna in each direction interval, the method further comprises, before evaluating the positioning performance of the positioning antenna, using the satellite number density corresponding to each carrier-to-noise ratio as an evaluation parameter:

And rounding the carrier-to-noise ratio corresponding to each direction interval.

7. An evaluation device of positioning performance is characterized by being applied to electronic equipment, and comprises:

The system comprises a first module, a second module, a third module, a fourth module, a fifth module and a sixth module, wherein the first module is used for acquiring the gain of a positioning antenna in each direction interval above a preset elevation angle and the satellite number density corresponding to each direction interval;

The first module is further configured to determine total duration corresponding to each elevation angle interval according to the position information of the positioning antenna, wherein each elevation angle interval is composed of direction intervals with the same elevation angle, the total duration corresponding to each elevation angle interval refers to total duration of each positioning satellite in the elevation angle interval in one earth-surrounding period of the positioning satellite, calculate ratios of the total duration corresponding to each elevation angle interval and the earth-surrounding period respectively to obtain satellite number densities corresponding to each elevation angle interval, and determine satellite number densities corresponding to each direction interval according to the satellite number densities corresponding to each elevation angle interval and angle values corresponding to each direction interval in the azimuth axial direction of the spherical coordinate system;

The second module is used for determining the carrier-to-noise ratio corresponding to each direction interval according to the gain of the positioning antenna in each direction interval, wherein the carrier-to-noise ratio corresponding to one direction interval refers to the carrier-to-noise ratio of the signal of each positioning satellite in the one direction interval;

The third module is used for evaluating the positioning performance of the positioning antenna by taking the satellite number density corresponding to each carrier-to-noise ratio as an evaluation parameter, wherein the satellite number density corresponding to one carrier-to-noise ratio is the sum of the satellite number densities of the target direction interval corresponding to the one carrier-to-noise ratio, the target direction interval is the direction interval with the carrier-to-noise ratio being greater than or equal to the one carrier-to-noise ratio, and the positioning performance of the positioning antenna is positively correlated with the evaluation parameter.

8. An electronic device comprising a positioning antenna, one or more memories, one or more processors, the one or more memories coupled to the one or more processors, the positioning antenna coupled to the one or more processors, the one or more memories storing computer instructions;

The one or more processors, when executing the computer instructions, cause the electronic device to perform the positioning performance assessment method of any one of claims 1-6.

9. A computer readable storage medium comprising computer instructions which, when executed, perform the positioning performance assessment method according to any one of claims 1-6.