CN118209937A - Testing device and darkroom - Google Patents

Abstract

The application provides a testing device and a darkroom, wherein the device is applied to the darkroom and comprises: a linear track for mounting a first corner reflector or a transmitting antenna of a communication system, the first corner reflector or the transmitting antenna being movable along the linear track; the arc-shaped track is used for installing a second corner reflector, and the second corner reflector can move along the arc-shaped track; the signal transmitting platform is used for installing a receiving antenna of the radar and the communication system, the linear track extends towards the signal transmitting platform, one side of the arc track, which is concave, faces the signal transmitting platform, and the signal transmitting platform is configured to be rotatable; and the data analysis device is used for performing performance test on the radar according to the echo signals received by the radar and/or performing air interface OTA test on the communication system according to the signals transmitted by the transmitting antenna and the signals received by the receiving antenna. The testing device and the darkroom provided by the application can save the testing cost.

Description

Testing device and darkroom

Technical Field

The application relates to the field of radar testing, in particular to a testing device and a darkroom.

Background

Radar is playing an increasingly important role as an important sensor in the fields of autopilot, exploration, etc. The radar can emit radar waves, and the position of a target object is determined according to the received reflected waves of the radar waves reflected from the target object, so that the target is identified and positioned. In general, performance indexes such as a measuring range, measuring precision, resolution and the like of a radar are tested by using a testing device for radar performance so as to ensure good radar performance.

As the accuracy requirements for radar increase, the requirements for radar performance testing apparatus also become higher. However, the performance data of the radar that can be detected by the current testing device is not comprehensive enough, i.e. each performance data of the radar needs to depend on different testing devices. Therefore, the construction cost and the maintenance cost of the testing device are increased, and the testing cost of the radar performance is increased.

Disclosure of Invention

The application provides a testing device and a darkroom, which can be used for carrying out various tests on different equipment such as a radar and a communication system, and can save the testing cost.

In a first aspect, a testing device is provided, the testing device being for use in a darkroom, the testing device comprising: a linear track for mounting a first corner reflector or a transmitting antenna of a communication system, the first corner reflector or the transmitting antenna being movable along the linear track; the arc-shaped track is used for installing a second corner reflector, and the second corner reflector can move along the arc-shaped track; the signal transmitting platform is used for installing a receiving antenna of the radar and the communication system, the linear track extends towards the signal transmitting platform, one side of the arc track, which is concave, faces the signal transmitting platform, and the signal transmitting platform is configured to be rotatable; the data analysis device is used for performing performance test on the radar according to echo signals received by the radar, and/or performing over-the-air OTA test on the communication system according to signals transmitted by the transmitting antenna and signals received by the receiving antenna, wherein the echo signals comprise signals generated by the first corner reflector or the second corner reflector receiving the transmitting signals of the radar, and parameters of the performance test comprise at least one of the following: distance range, distance resolution, angle range, or angle resolution.

According to the application, the rotatable signal transmitting platform, the linear track and the arc track are arranged in the darkroom, so that the radar faces the linear track or the arc track through the rotation of the signal transmitting platform, various performance tests of the radar are realized, the efficiency of the performance test of the radar can be improved, and the cost of the radar test is reduced. In addition, the signal transmitting platform and the linear track can be respectively used for installing a receiving antenna and a transmitting antenna of the communication system so as to realize OTA test of the communication system, so that various tests of different equipment such as a radar, the communication system and the like can be realized in a darkroom through the testing device, and the testing cost can be saved.

With reference to the first aspect, in certain implementations of the first aspect, the linear rail, the arc rail, and the signal transmission platform are disposed on a horizontal plane, the signal transmission platform is rotatable on the horizontal plane, and the signal transmission platform is disposed between the linear rail and the arc rail.

In the embodiment of the application, the linear track, the arc track and the signal transmitting platform are arranged on the horizontal plane, and the signal transmitting platform is arranged between the linear track and the arc track, so that the mutual interference between the linear track and the arc track can be reduced, and the influence on the test is reduced.

With reference to the first aspect, in certain implementations of the first aspect, the radar and the receiving antenna are respectively mounted on opposite sides of the signal transmitting platform.

Thus, the structural interference and signal interference of the radar and the receiving antenna can be reduced, and the influence of the structural interference and the signal interference on the test is reduced. On the other hand, the radar performance test and the OTA test of the communication system can be simultaneously carried out when the radar faces the arc-shaped track and the receiving antenna faces the linear track, and the test efficiency can be improved.

With reference to the first aspect, in certain implementations of the first aspect, a straight direction of the straight track is parallel to a central axis of the radar's transmitted signal, and a distance from the first corner reflector to the central axis of the radar's transmitted signal is less than or equal to 2.5cm.

In the embodiment of the application, the problem of inaccurate radar performance such as radar distance range and range resolution test caused by moving the first corner reflector out of the angle range of the radar can be avoided as far as possible by controlling the distance between the first corner reflector on the linear track and the central axis of the transmitted signal of the radar to be in the range of 2.5cm, so that the accuracy of the radar performance test is improved.

With reference to the first aspect, in certain implementations of the first aspect, a circular mandrel of the arcuate track is perpendicular to a central axis of the radar's transmitted signal, and a central axis distance of the second corner reflector to the radar's transmitted signal is less than or equal to 2.5cm.

In the embodiment of the application, the problem of inaccurate radar performance such as radar angle range and angle resolution test caused by the fact that the second corner reflector moves out of the range of the distance of the radar can be avoided as far as possible by controlling the circular mandrel of the arc track to be perpendicular to the central axis of the transmitted signal of the radar and the distance from the second corner reflector on the arc track to the central axis of the transmitted signal of the radar to be in the range of 2.5cm, so that the accuracy of the radar performance test is improved.

With reference to the first aspect, in certain implementations of the first aspect, the radar is disposed on a circular mandrel of the arcuate track.

Thus, under the condition that the distance from the second corner reflector to the radar is the same, performance tests such as angle range and angle resolution can be performed on the radar according to the echo signals reflected by the second corner reflector, and accuracy of the performance test of the radar can be improved.

With reference to the first aspect, in certain implementations of the first aspect, the linear rail includes a first linear rail for mounting a first angular emitter.

With reference to the first aspect, in certain implementation manners of the first aspect, the linear track further includes a second linear track parallel to the first linear track, the second linear track is used for mounting another first corner reflector, and a distance d ₁ between the two first corner reflectors along the first direction satisfies: d ₁ is more than or equal to 0 and less than or equal to d, wherein d=c/2b, c is the light speed, B is the bandwidth of a transmission signal of the radar, and the first direction is the direction on a plane perpendicular to the linear direction of the linear track.

The radar performance is tested through the two corner reflectors, so that the radar testing efficiency can be improved. On the other hand, controlling the distances of the two first corner reflectors in the first direction within a certain range can reduce the influence on the radar performance test due to the excessive distance. For example, by controlling the distances of the two first corner reflectors in the first direction within a certain range, it is possible to approximate that the two corner reflectors are in the same direction, so that the performance of the radar such as the distance resolution can be more accurately tested.

With reference to the first aspect, in certain implementations of the first aspect, the arcuate track includes a first arcuate track for mounting a second corner reflector.

With reference to the first aspect, in certain implementation manners of the first aspect, the arc-shaped track further includes a second arc-shaped track parallel to the first arc-shaped track, the second arc-shaped track is used for mounting another second corner reflector, and a distance d ₂ between the two second corner reflectors along the second direction satisfies: d ₂ is less than or equal to d, wherein d=c/2b, c is the light speed, B is the bandwidth of the transmitted signal of the radar, and the second direction is parallel to the center axis of the arc track.

The radar performance is tested through the two corner reflectors, so that the radar testing efficiency can be improved. On the other hand, controlling the distances of the two second corner reflectors in the second direction within a certain range can reduce the influence on the radar performance test due to the excessive distance. For example, the distances of the two second corner reflectors in the second direction are controlled within a certain range, and the distances between the two second corner reflectors and the radar can be approximately considered to be the same, so that the performance of the radar, such as the angular resolution, can be more accurately tested.

With reference to the first aspect, in some implementations of the first aspect, the signal transmitting platform is further configured to install a calibration antenna, where the calibration antenna is a horizontally polarized antenna, a vertical dimension antenna of the radar is parallel to a horizontal plane, and a distance between the calibration antenna and the radar along a third direction is N times a wavelength of a transmitted signal of the radar, and the third direction is parallel to the horizontal plane and perpendicular to a central axis of the transmitted signal of the radar; and the data analysis device is used for performing performance test on the radar according to echo signals respectively received by the radar and the calibration antenna, wherein the echo signals comprise signals generated by the second corner reflector receiving the transmitting signals of the calibration antenna.

In the embodiment of the application, the radar can be tested for performance, such as vertical angle resolution, by setting the calibration antenna with horizontal polarization, setting the vertical dimension antenna of the radar to be parallel to the horizontal plane, and setting the distance between the calibration antenna and the radar along the third direction to be N times of the wavelength of the transmitted signal of the radar, so that the echo signals respectively received by the radar and the calibration antenna can be utilized.

With reference to the first aspect, in certain implementations of the first aspect, a position of at least one of the linear rail, the arcuate rail, or the signaling platform in a vertical direction is adjustable.

With reference to the first aspect, in certain implementations of the first aspect, a position of the first corner reflector, the second corner reflector, the transmitting antenna, the radar or the receiving antenna in a vertical direction is adjustable.

With reference to the first aspect, in some implementations of the first aspect, the radar is a millimeter wave radar in the 80GHz band.

With reference to the first aspect, in certain implementations of the first aspect, the length of the linear track is 3.7m, the radius of the arc track is 1.5m, and the central angle of the arc track is 180 °.

In a second aspect, a darkroom is provided, the darkroom comprising the testing device according to the first aspect or any of the possible implementation manners of the first aspect, and the length and the width of the testing darkroom are 8m and 4m, respectively.

Drawings

Fig. 1 is a schematic diagram of a testing device according to an embodiment of the present application.

Fig. 2 is a schematic partial view of a testing device according to an embodiment of the present application.

Fig. 3 is a schematic partial view of a testing device according to an embodiment of the present application.

Fig. 4 is a schematic partial view of a testing device according to an embodiment of the present application.

FIG. 5 is a schematic diagram of a test darkroom according to an embodiment of the present application.

Reference numerals:

The device comprises a testing device 100, a linear track 110, an arc track 120, a signal transmitting platform 130, a data analysis device 140, a first corner reflector 151, a second corner reflector 152, a radar 153, a transmitting antenna 161, a receiving antenna 162 and a calibration antenna 171, wherein the first linear track 111, the second linear track 112, the first arc track 121 and the second arc track 122.

Detailed Description

In the description of the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.

In the embodiment of the application, prefix words such as "first" and "second" are adopted, and only for distinguishing different description objects, no limitation is imposed on the position, sequence, priority, quantity or content of the described objects. The use of ordinal words and the like in embodiments of the present application to distinguish between the prefix words used to describe an object does not limit the described object, and statements of the described object are to be read in the claims or in the context of the embodiments and should not constitute unnecessary limitations due to the use of such prefix words.

In the present application, directional terms "upper", "lower", etc. are defined with respect to the orientation in which the components are schematically disposed in the drawings, and it should be understood that these directional terms are relative concepts, which are used for description and clarity with respect thereto, and which may be changed accordingly in accordance with the change in the orientation in which the components are disposed in the drawings.

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

Fig. 1 is a schematic diagram of a testing apparatus 100 according to an embodiment of the application. The test device 100 is applied to a darkroom, and the test device 100 comprises a linear rail 110, an arc rail 120, a signal transmitting platform 130 and a data analysis device 140.

A linear rail 110 for mounting the first corner reflector 151 or the transmitting antenna 161 of the communication system, the first corner reflector 151 or the transmitting antenna 161 being movable along the linear rail 110.

The arc-shaped rail 120 is used for mounting the second corner reflector 152, and the second corner reflector 152 is movable along the arc-shaped rail 120.

A signal transmitting platform 130 for mounting the radar 153 and a receiving antenna 162 of a communication system, the linear rail 110 extending toward the signal transmitting platform 130, a concave side of the arc rail 120 facing the signal transmitting platform 130, the signal transmitting platform 130 being configured to be rotatable.

The data analysis device 140 is configured to perform a performance test on the radar 153163 according to the echo signal received by the radar 153, and/or perform an Over The Air (OTA) test on the communication system according to the signal transmitted by the transmitting antenna 161 and the signal received by the receiving antenna 162 by the transmitting antenna 161.

Wherein the echo signal includes a signal generated by the first corner reflector 151 or the second corner reflector 152 receiving a signal of the radar 153, and the parameter of the performance test of the radar 153 includes at least one of the following: distance range, distance resolution, angle range or angle resolution, etc.

In the present application, the signal transmitting platform 130 may be rotated such that the first corner reflector 151 or the second corner reflector 152 receives a signal of the radar 153 and generates an echo signal and transmits the echo signal to the radar 153 when the radar 153 is directed toward the linear track 110 or the arc track 120, and/or such that the receiving antenna 162 receives a signal transmitted from the transmitting antenna 161 when the receiving antenna 162 is directed toward the linear track 110.

In order to reduce external environmental interference and multipath effects and improve the testing accuracy of detection performance of the radar 153, the communication system and the like, an operating environment without echo and electromagnetic shielding is generally required to be simulated, so that a darkroom testing environment is adopted for testing. For example, the darkroom may be an enclosed space made of a wave absorbing material.

The radar 153 may also be referred to as a detector, a detection device or a radio signal transmission device. The principle of operation is to detect a corresponding target object by transmitting a radar 153 signal (alternatively referred to as a detection signal or radar 153 wave) and receiving an echo signal reflected by the target object.

The corner reflectors are widely used in the field of radar 153 detection. The corner reflector is typically a rigid structure consisting of a plurality of metallic surfaces, within which an incident electromagnetic wave signal may undergo multiple internal reflections, thereby generating an echo signal and reflecting the echo signal towards the radar 153, so as to determine performance parameters of the radar 153, such as a range, a range resolution, an angular range, an angular resolution, etc., of the radar 153, based on the echo signal.

The range may refer to a range in which the radar 153 can recognize a target. That is, the range between the maximum detection distance and the minimum detection distance at which the radar 153 can recognize the target is the range of the radar 153.

The distance resolution may refer to the minimum distance between two targets in the same direction that can be distinguished by the radar 153. I.e. the ability of the radar 153 to resolve two close range targets. The range resolution is related to the pulse width of the signal transmitted by the radar 153. The narrower the pulse width of the signal transmitted by the radar 153, the higher the range resolution of the radar 153.

When the time interval of the echo signals of two targets in the same direction is within one pulse width, the two echo signals are connected together and cannot be distinguished due to the formation of simultaneous scattering, and thus the two targets cannot be distinguished. In the case that the two targets cannot be distinguished, the corresponding maximum distance is the distance resolution.

In the present application, the first corner reflector 151 may move on the linear rail 110. During the movement of the first corner reflector 151, the radar 153 transmits a signal to the first corner reflector 151, the first corner reflector 151 receives the signal of the radar 153 and reflects an echo signal to the radar 153, and the data analysis device 140 tests the performance of the radar 153, such as a range and a range resolution, according to the echo signal received by the radar 153.

The angular range may be referred to as a field of view (FOV) of the radar 153, and indicates an angular range in which the radar 153 can recognize an object. That is, the radar 153 is used as an apex, and the angle formed by the two edges of the maximum range in which the target can be recognized by the radar 153 is used. The FOV may generally include a horizontal FOV (horizontal angular range) and a vertical FOV (vertical angular range).

Angular resolution refers to the minimum angle between two targets that are different from the same direction that can be distinguished by the radar 153. The angular resolution includes a horizontal angular resolution and a vertical angular resolution. The angular resolution is related to the beam width of the signal transmitted by the radar 153, and the narrower the beam of the signal transmitted by the radar 153, the higher the angular resolution of the radar 153.

When two targets having the same distance and different directions from the radar 153 are received by the radar 153, the radar 153 can distinguish the two targets when the time interval between the echo signals of the two targets is greater than or equal to the time width. When the time interval of the echo signals of the two is smaller than the time width, the two signals are aliased together in the time domain, and it is difficult to distinguish the two targets.

In the present application, the second corner reflector 152 may move on the arc-shaped rail 120, and the radar 153 transmits a signal to the second corner reflector 152 during the movement of the second corner reflector 152, the second corner reflector 152 receives the signal of the radar 153 and reflects an echo signal to the radar 153, and the data analysis device 140 tests the performance of the radar 153, such as an angular range, an angular resolution, according to the echo signal received by the radar 153.

Since the information transmission between the transmitter and the receiver of the communication system is realized by an interface, the transmission interface of the transmitter and the receiver in the air is an air interface (air interface). The OTA test is to evaluate the air interface performance of the communication system, and generally mainly includes two main indexes: one is the performance of the transmitter, i.e. the ability to send information out, such as total radiated power; one is the performance of the receiver, i.e. the ability to receive signals, such as the reception sensitivity.

In some embodiments, the test apparatus 100 may be used to test the performance of a transmitter, such as the total radiated power of the transmitter.

In some embodiments, the test apparatus 100 may also be used to test the performance of a receiver, such as the receiver's reception sensitivity. For example, the reciprocity can be exploited to derive the receiver's performance away from the performance of the transmitter under test.

In an embodiment of the application, the transmitter is configured with a transmit antenna 161 and the receiver is configured with a receive antenna 162. For example, the transmitter may be a base station and the receiver may be a terminal device such as a cell phone.

In the embodiment of the present application, the data analysis device 140 for performing the performance test on the radar 153 and the OTA test on the communication system may be integrated together or may be separately provided.

For example, the performance of the radar 153 may be tested using a radar data analysis device, which may obtain echo signals received by the radar 153, and determine performance test parameters of the radar 153 based on the echo signals.

For example, the communication system may be subjected to OTA testing using a vector network analyzer, which may obtain data of the transmitting antenna 161 and/or the receiving antenna 162, thereby implementing the OTA testing of the communication system. For example, the adjacent channel leakage ratio of the transmitting antenna 161 at each point may be acquired, thereby determining the adjacent channel leakage ratio of the transmitting antenna 161 as a whole.

In the application, the rotatable signal transmitting platform 130, the linear rail 110 and the arc rail 120 are arranged in the darkroom, so that the radar 153 faces the linear rail 110 or the arc rail 120 through the rotation of the signal transmitting platform 130, various performance tests of the radar 153 are realized, the performance test efficiency of the radar 153 can be improved, and the test cost of the radar 153 is reduced. In addition, the signal transmitting platform 130 and the linear track 110 may be used to install the receiving antenna 162 and the transmitting antenna 161 of the communication system, so as to realize OTA testing of the communication system, thereby realizing multiple tests of different devices such as the radar 153 and the communication system in a darkroom through the testing device 100, and saving testing cost.

In some embodiments of the present application, as shown in fig. 1, the linear rail 110, the arc rail 120 and the signal emitting platform 130 are disposed on a horizontal plane, the signal emitting platform 130 is rotatable on the horizontal plane, and the signal emitting platform 130 is disposed between the linear rail 110 and the arc rail 120.

That is, the linear rail 110, the arc rail 120 and the signal transmitting platform 130 are positioned on the same straight line of the horizontal plane. The angle α formed by the line between the extension of the linear track 110 and the signal transmitting platform 130 and the line between the arc track 120 and the signal transmitting platform 130 may be 180 °.

In the embodiment of the application, the linear rail 110, the arc rail 120 and the signal transmitting platform 130 are arranged on the horizontal plane, and the signal transmitting platform 130 is arranged between the linear rail 110 and the arc rail 120, so that the mutual interference between the linear rail 110 and the arc rail 120 can be reduced, and the influence on the test is reduced.

Alternatively, the angle formed by the line extending from the linear track 110 and the signal transmitting platform 130, and the line extending from the arc track 120 and the signal transmitting platform 130 may be other angles, such as 90 ° or 270 °.

In some embodiments of the present application, radar 153 and receive antenna 162 are mounted on opposite sides of signal transmitting platform 130, respectively.

For example, the signal transmitting platform 130 may include two mounting locations thereon, one for mounting the radar 153 and the other for mounting the receiving antenna 162, the two mounting locations being located on opposite sides of the signal transmitting platform 130. For example, the rotation axis of the signal emitting platform 130 and the projection of the centers of the two mounting positions on the horizontal plane are on a straight line.

As an example, when the signal transmitting platform 130 is disposed between the linear track 110 and the arc track 120, the radar 153 may be further directed toward the arc track 120, and the receiving antenna 162 may be directed toward the linear track 110, while performance tests of the radar 153 such as a test of an angular range, a test of an angular resolution, and an OTA test of a communication system are performed. Then, the signal transmitting platform 130 is rotated by about 180 degrees, the radar 153 is directed to the linear track 110, and the performance of the radar 153 such as the distance range and the distance resolution is tested.

In this way, the structural interference and signal interference of the radar 153 and the receiving antenna 162 can be reduced, thereby reducing the influence of the structural interference and signal interference on the test. On the other hand, the performance test of the radar 153 and the OTA test of the communication system can be simultaneously performed when the radar 153 faces the arc-shaped track 120 and the receiving antenna 162 faces the linear track 110, and the test efficiency can be improved.

In some embodiments of the present application, the linear direction of the linear rail 110 is parallel to the central axis of the transmission signal of the radar 153, and the distance from the first corner reflector 151 to the central axis of the transmission signal of the radar 153 is less than or equal to 2.5cm.

When the first corner reflector 151 moves along the linear rail 110, the movement path thereof is parallel to the central axis of the transmission signal of the radar 153, and the distance from the first corner reflector 151 to the central axis of the transmission signal of the radar 153 is a fixed value and less than or equal to 2.5cm.

In this embodiment, at least a portion of the first corner reflector 151 exists within 2.5cm from the central axis centered on the central axis on a plane perpendicular to the central axis on which the radar 153 emits signals.

As an example, when the linear rail 110, the arc rail 120, and the signal transmission platform 130 are disposed on a horizontal plane, a distance from the first corner reflector 153 to a central axis of the radar 153 for transmitting a signal is 2cm in a vertical direction. The moving track of the first corner reflector 152 may be located below the central axis of the transmission signal of the radar 153, or may also be located above the central axis of the transmission signal of the radar 153.

The radar 153 emits a signal in which energy in a direction along a central axis of the emitted signal of the radar 153 is maximum, whereby outward energy gradually decreases. In order to prevent the first corner reflector 151 of the linear rail 110 from moving outside the angular range of the radar 153 during movement, thereby causing an inability to accurately test performance parameters of the radar 153 such as a minimum detection distance, it is possible to make the distance between the first corner reflector 151 and the central axis of the radar 153 a fixed value less than or equal to 2.5cm when the first corner reflector moves on the linear rail.

In the embodiment of the present application, the linear direction of the linear rail 110 may also be referred to as the extending direction or the length direction of the linear rail 110.

In the embodiment of the application, the distance between the first corner reflector 151 on the linear track 110 and the central axis of the radar 153, which is parallel to the central axis of the radar 153, and the central axis of the radar 153, which is in the range of 2.5cm, can avoid the problem that the performance of the radar 153, such as the range of the radar 153 and the inaccuracy of the range resolution test, caused by the movement of the first corner reflector 151 beyond the angle range of the radar 153, as far as possible, thereby improving the accuracy of the performance test of the radar 153.

In some embodiments of the present application, the center axis of the arc-shaped rail 120 is perpendicular to the central axis of the transmission signal of the radar 153, and the central axis distance of the second angle reflector 152 to the transmission signal of the radar 153 is less than or equal to 2.5cm.

When the arc-shaped rail 120 moves, the circular mandrel of the movement track of the second corner reflector 152 is perpendicular to the central axis of the transmission signal of the radar 153, and the distance from the second corner reflector 152 to the central axis of the transmission signal of the radar 153 is a fixed value and less than or equal to 2.5cm.

In this embodiment, at least a portion of the second corner reflector 152 exists within 2.5cm from the central axis centered on the central axis on a plane perpendicular to the central axis on which the radar 153 emits signals.

As an example, when the linear rail 110, the arc rail 120, and the signal transmitting platform 130 are disposed on a horizontal plane, a distance from the second corner reflector 152 to a central axis of the radar 153 transmitting a signal is 2cm in a vertical direction. The moving rail of the second corner reflector 152 may be located below the central axis of the radar 153, or may be located above the central axis of the radar 153.

In the embodiment of the application, by controlling the center axis of the arc track 120 to be perpendicular to the central axis of the transmitted signal of the radar 153 and controlling the distance from the second corner reflector 152 on the arc track 120 to the central axis of the transmitted signal of the radar to be within 2.5cm, the problem that the radar performance, such as the radar angle range and the angular resolution test, is inaccurate due to the fact that the second corner reflector 152 moves out of the distance range of the radar 153 can be avoided as much as possible, and the accuracy of the radar performance test is improved.

In some embodiments of the present application, radar 153 is disposed on the circular mandrel of arcuate track 120.

The radar 153 is disposed on the center axis of the arc track 120, so that the distance from the second corner reflector 152 to the radar 153 is always equal when the second corner reflector 152 moves on the arc track 120.

In this way, in the case where the distances from the second corner reflector 152 to the radar 153 are the same, performance tests such as angle range, angle resolution test, etc. can be performed on the radar 153 based on the echo signals reflected by the second corner reflector 152, and the accuracy of the performance test of the radar 153 can be improved.

Fig. 2 and 3 are partial schematic views of a testing device 100 according to an embodiment of the application. The test apparatus 100 is further described below in conjunction with fig. 2 and 3.

In some embodiments of the present application, the linear rail includes a first linear rail 111, the first linear rail 111 being configured to mount a first angular emitter 151.

As an example, when the distance between the radar 153 and the first corner reflector 151 is D ₁, the intensity of the echo signal received by the radar 153 is greater than or equal to a certain threshold value, the first corner reflector 151 is continuously moved on the linear track 110 to increase the distance between the first corner reflector 151 and the radar 153, the intensity of the echo signal received by the radar 153 is less than a certain threshold value, and the distance D ₁ may be used as the maximum detection distance that the radar 153 can identify the target, that is, the upper limit of the distance range.

When the distance between the radar 153 and the first corner reflector 151 on the linear track 110 is D ₂, the intensity of the echo signal received by the radar 153 is greater than or equal to a certain threshold value, the radar 153 continues to move the first corner reflector 151 on the linear track 110 to reduce the distance between the first corner reflector 151 and the radar 153, the radar 153 cannot normally receive the echo signal, such as the intensity of the received echo signal is less than the certain threshold value, and the distance D ₂ can be used as the minimum detection distance, namely the lower limit of the distance range, where the radar 153 can identify the target.

For example, the first corner reflector 151 may move on the first rectilinear track 111 from approaching the radar 153 to moving away from the radar 153. During the movement of the first corner reflector 151 in a direction away from the radar 153, the radar 153 starts to fail to receive the echo signal or the intensity of the received echo signal is smaller than a certain threshold; when the first corner reflector 151 is moved further away from the radar 153 to the first position, the intensity of the echo signal received by the radar 153 is equal to or higher than the certain threshold value, and at this time, the distance between the first position and the radar 153 may be regarded as the minimum detection distance of the radar 153. The first corner reflector 151 continues to move to the second position in a direction away from the radar 153, and when the intensity of the echo signal received by the radar 153 is smaller than another threshold value, the distance between the second position and the radar 153 may be taken as the maximum detection distance of the radar 153.

Alternatively, the first corner reflector 151 may also be moved on the first rectilinear track 111 from a direction away from the radar 153 to a direction closer to the radar 153.

In some embodiments, the echo intensity of the radar signal may be represented by a radar cross-sectional area (radar cross section). For example, when measuring the maximum detection range of the radar, the corresponding RCS threshold may be 26 decibels square meters (dbsm); the corresponding RCS threshold may be 32dbsm when measuring the minimum detection distance of the radar.

In some embodiments of the present application, the linear rail 110 further includes a second linear rail 112 parallel to the first linear rail 111, the second linear rail 112 being used for mounting another first corner reflector 151, and a distance d ₁ between the two first corner reflectors 151 along the first direction is as follows: d ₁ is 0 or less and d is 2B, where d=c/2B, c is the speed of light, B is the bandwidth of the transmitted signal of the radar, and the first direction is the direction on the plane perpendicular to the linear direction of the linear track 110.

As an example, as shown in fig. 2, the linear rail 110 may include a first linear rail 111 and a second linear rail 121 that are parallel to each other in a horizontal direction, the first linear rail 111 and the second linear rail 121 being used to mount two first corner reflectors 151, respectively, and if b=1 GHz, a distance d ₁ between the two first corner reflectors 151 in the horizontal direction satisfies: d ₁ is more than or equal to 0 and less than or equal to 15cm.

The distance between the two first corner reflectors 151 in the first direction may be a distance between the two corner reflectors in the horizontal direction, or may be a distance between the two corner reflectors in the vertical direction, or may be a distance between the two corner reflectors in other directions perpendicular to the plane of the linear direction of the linear rail 110.

As an example, one first corner reflector 151 may be moved from an end of the first rectilinear track 111 near the radar 153, and the other first corner reflector 151 may be moved from an end of the second rectilinear track 110 far from the radar 153. During the movement of the one first corner reflector 151 in a direction away from the radar 153, the radar 153 cannot receive an echo signal; when the first corner reflector 151 is continuously moved to the first position in a direction away from the radar 153, the intensity of the echo signal received by the radar 153 is greater than or equal to a certain threshold value, and the distance between the first position and the radar 153 may be regarded as the minimum detection distance of the radar 153. When the other first corner reflector 151 moves in a direction away from the radar 153, the radar 153 cannot receive an echo signal or the intensity of the received echo signal is less than a certain threshold; when the other first corner reflector 151 is moved to the second position, the intensity of the echo signal received by the radar 153 is greater than or equal to a certain threshold value, and the distance between the second position and the radar 153 may be taken as the maximum detection distance of the radar 153.

As another example, two first corner reflectors 151 may be mounted on the first and second linear rails 111 and 112, respectively, initial positions of the two first corner reflectors 151 are the same as a distance of the radar 153, and a distance of the two first corner reflectors 151 in a vertical direction is 2.5cm. One first corner reflector 151 is kept at a different home position, and the other first corner reflector 151 is moved in a direction approaching or moving away from the radar 153 until the two first corner reflectors can be distinguished based on an echo signal received by the radar 153, at which time a distance between the two first corner reflectors 151 along a length direction of the linear rail 110 can be taken as a distance resolution of the radar 153.

The performance of the radar 153 is tested through the two corner reflectors, so that the efficiency of the radar 153 test can be improved.

On the other hand, controlling the distance between the two first corner reflectors 151 in the first direction within a certain range can reduce the influence of the excessive distance on the performance test of the radar 153 and improve the accuracy of the performance test of the radar 153. For example, controlling the distance of the two first corner reflectors 151 in the first direction within a certain range may approximate that the two corner reflectors are in the same direction, so that the performance of the radar 153, such as the distance resolution, can be more accurately tested.

In some embodiments of the present application, the arc-shaped rail 120 includes a first arc-shaped rail 121, and the first arc-shaped rail 121 is used to mount a second corner reflector 152.

As an example, when the intensity of the echo signal received by the radar 153 is greater than or equal to a certain threshold value in the course of the second corner reflector 152 moving from one end to the other end of the arc-shaped rail 120, it may be considered that the second corner reflector 152 is located within an angle range in which the radar 153 can recognize the target; when the intensity of the echo signal received by the radar 153 is less than or equal to a certain threshold value, the second corner reflector 152 may be considered to be located outside the angular range in which the radar 153 can recognize the target. The radar 153 is used as an apex, and when the intensity of the echo signal received by the radar 153 is greater than or equal to a certain threshold, the angle corresponding to the moving track of the second corner reflector 152 is used as the angle range in which the radar 153 can identify the target.

Radar 153 may be placed horizontally on signaling platform 130, determining the horizontal FOV of radar 153. The radar 153 is then rotated 90 ° in a direction perpendicular to the placement surface of the signaling platform 130 to determine the radar 153 vertical FOV.

For example, the intensity of the echo signal received by the radar 153 is increased from small to small and then decreased again in the course of moving one second corner reflector 152 from one end of the first arc-shaped track 121 to the other. When the intensity of the echo signal received by the radar 153 is greater than or equal to a certain threshold value, the central angle formed between the moving track formed by the corresponding second corner reflector 152 and the radar 153 is the angle range of the radar 153.

In some embodiments of the present application, the arc-shaped rail 120 further includes a second arc-shaped rail 122 parallel to the first arc-shaped rail 121, the second arc-shaped rail 122 being used to mount another second corner reflector 152, and a distance d ₂ between the two second corner reflectors 152 along the second direction is satisfied: d ₂ is more than or equal to 0 and less than or equal to d, wherein d=c/2b, c is the light speed, B is the bandwidth of the transmitted signal of the radar, and the second direction is parallel to the center axis of the arc-shaped track 120.

As an example, as shown in fig. 3, the arc-shaped rail 120 includes a first arc-shaped rail 121 and a second arc-shaped rail 122 disposed parallel to each other in the vertical direction, and if b=1 GHz, a distance d ₂ between the two second corner reflectors 152 in the vertical direction satisfies: d ₂ is more than or equal to 0 and less than or equal to 15cm.

For example, one second corner reflector 152 may be moved in a clockwise direction from one end of the first arc-shaped rail 121, and the other second corner reflector 152 may be moved in a counterclockwise direction from the other end of the second arc-shaped rail 122. In the moving process of the second corner reflector 152, the radar 153 cannot receive the echo signal or the intensity of the received echo signal is smaller than a certain threshold value; when the second corner reflector 152 is moved to the first position, the intensity of the echo signal received by the radar 153 is greater than or equal to a certain threshold value. When the other second corner reflector 152 moves, the radar 153 cannot receive the echo signal or the received echo signal is less than or equal to a certain threshold value; when the other second corner reflector 152 is moved to the second position, the intensity of the echo signal received by the radar 153 is greater than or equal to a certain threshold value. Taking the radar 153 as an apex, an angle formed between the radar 153 and the two second corner reflectors 152 may be an angle range that the radar 153 can recognize.

For example, two second corner reflectors 152 may be placed at rail intermediate positions of the first and second arc rails 121 and 122, respectively, one second corner reflector 152 may remain at a different home position, and the other second corner reflector 152 may be moved in a counterclockwise or clockwise direction until the second corner reflector 152 is moved to a third position, and the two second corner reflectors 152 may be distinguished based on an echo signal received by the radar 153. At this time, the radar 153 is used as an apex, and an angle formed between the radar 153 and the track middle position and the third position can be used as an angular resolution of the radar 153.

The performance of the radar 153 is tested through the two corner reflectors, so that the efficiency of the radar 153 test can be improved.

On the other hand, controlling the distance between the two second corner reflectors 152 in the second direction within a certain range can reduce the influence of the excessive distance on the performance test of the radar 153 and improve the accuracy of the radar performance test. For example, the distances of the two second corner reflectors 152 in the second direction are controlled within a certain range, and the distances of the two second corner reflectors 152 and the radar 153 can be approximately regarded as the same, so that the performance of the radar 153, such as the angular resolution, can be more accurately tested.

In some embodiments, as shown in fig. 4, the signal transmitting platform 130 is further configured to mount a calibration antenna 171, where the calibration antenna 171 is a horizontally polarized antenna, a vertical dimension antenna of the radar 153 is parallel to a horizontal plane, and a distance between the calibration antenna 171 and the radar 153 along a third direction is N times a wavelength of a transmission signal of the radar 153, and the third direction is parallel to the horizontal plane and perpendicular to a central axis of the transmission signal of the radar 153; the data analysis device 140 is configured to perform performance test on the radar 143 according to echo signals respectively received by the radar 153 and the calibration antenna 171, where the echo signals include signals generated by the second corner reflector 152 receiving the transmission signals of the calibration antenna 171.

In the present application, the radar 153 may be horizontally placed on the signal transmission platform 130, and the horizontal angular resolution of the radar 153 may be determined. The radar 153 is then rotated 90 ° in a direction perpendicular to the placement surface of the signal emitting platform 130 to determine the vertical angular resolution of the radar 153.

Illustratively, the calibration antenna 171 may be a horn antenna.

Illustratively, a calibration antenna 171 and a radar 153, which may be horizontally polarized, are disposed on the signal transmitting platform 130 disposed on a horizontal plane, a vertical dimension antenna of the radar 153 is parallel to the horizontal plane, a distance between the calibration antenna 171 and the radar 153 in a third direction is N times a wavelength of a transmission signal of the radar 153, and then the radar 153 and the calibration antenna 171 are controlled to transmit signals to the second corner reflector 152.

For example, two second corner reflectors 152 may be placed at track intermediate positions of the first arc track 121 and the second arc track 122, respectively, and the angle information of the second corner reflectors 152 determined by the radar 153 and the calibration antenna 171 based on the echo signals at this time is recorded; one of the second corner reflectors 152 is kept at a different home position, and the other second corner reflector 152 is moved in a counterclockwise or clockwise direction until the second corner reflector 152 is moved to a third position until the two second corner reflectors 152 can be distinguished based on angle information determined based on echo signals received by the radar 153 and the calibration antenna 171. At this time, the radar 153 is used as an apex, and an angle formed between the radar 153 and the track middle position and the third position can be used as an angular resolution of the radar 153.

In this embodiment, during the movement of the second corner reflector 152, the radar 153 and the calibration antenna 171 may determine angle information α ₁ and α ₂ of the second corner reflector 152, respectively, and an angle determined based on the two angle information, for example, a mean value, may be used as angle information of the second corner reflector 152 determined by the radar 153 and the calibration antenna 171 based on the echo signal.

In the embodiment of the present application, the radar 153 may be tested for performance, for example, vertical angular resolution, by setting the calibration antenna 171 polarized horizontally, setting the vertical dimension antenna of the radar 153 parallel to the horizontal plane, and setting the distance between the calibration antenna 171 and the radar 153 along the third direction to be N times the wavelength of the transmission signal of the radar 153, so that the echo signals respectively received by the radar 153 and the calibration antenna 171 may be utilized.

In some embodiments of the present application, the position of at least one of the linear rail 110, the arcuate rail 120, or the signaling platform 130 is adjustable in a vertical and/or horizontal position.

The position of at least one of the linear rail 110, the arcuate rail 120, or the signaling platform 130 in the vertical and/or horizontal position may be automatically adjusted or may be manually adjusted.

As an example, the linear rail 110 may implement position adjustment of the linear rail 110 in the vertical direction by telescoping of the bracket. For example, the expansion and contraction of the bracket can be automatically adjusted through motor driving, or the expansion and contraction of the bracket can be manually adjusted through threaded connection on the two sections of sub-brackets.

In the embodiment of the application, the position of at least one of the linear track 110, the arc track 120 or the signal transmitting platform 130 in the vertical direction and/or the horizontal direction is adjustable, so that the testing requirements of the relative positions and distances between the first corner reflector 151 or the second corner reflector 152 and the radar 153, the receiving antenna 162 and the transmitting antenna 161 can be met, and the radar 153 and the corner reflectors, the receiving antenna 162 and the transmitting antenna 161 with different models and different sizes can be adapted, thereby improving the applicability and the flexibility of the measuring device.

In some embodiments of the present application, a position of at least one of the first corner reflector 151, the second corner reflector 152, the transmitting antenna 161, the radar 153, or the receiving antenna 162 in a vertical direction and/or a horizontal direction is adjustable.

Taking the first corner reflector 151 as an example, the first corner reflector 151 may be connected to the linear rail 110 by a bracket that may be extended and contracted to adjust the position of the first corner reflector 151 in the vertical direction. For example, the expansion and contraction of the bracket can be automatically adjusted through motor driving, or the expansion and contraction of the bracket can be manually adjusted through threaded connection on the two sections of sub-brackets.

In some embodiments of the application, radar 153 is a millimeter wave radar in the 80GHz band.

In some embodiments of the application, the communication system is an industrial, scientific, and medical (industrial SCIENTIFIC MEDICAL, ISM) band communication system.

In some embodiments of the present application, the length of the linear rail 110 is 3.7m, the radius of the arc-shaped rail 120 is 1.5m, and the central angle of the arc-shaped rail 120 is 180 °.

As shown in FIG. 5, the present application also provides a darkroom 500, which comprises the testing device 100 according to the embodiment of the present application, and is 8 meters long and 4 meters wide.

In some embodiments, the inner wall of the darkroom 500 may be an electromagnetic wave absorbing material.

The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (16)

1. A test device for use in a darkroom, the test device comprising:

A linear track for mounting a first corner reflector or a transmitting antenna of a communication system, the first corner reflector or the transmitting antenna being movable along the linear track;

the arc-shaped track is used for installing a second corner reflector, and the second corner reflector can move along the arc-shaped track;

A signal transmitting platform for mounting a radar and a receiving antenna of the communication system, the linear track extending toward the signal transmitting platform, a concave side of the arcuate track facing the signal transmitting platform, the signal transmitting platform configured to be rotatable;

the data analysis device is used for performing performance test on the radar according to echo signals received by the radar, and/or performing over-the-air OTA test on the communication system according to signals transmitted by the transmitting antenna and signals received by the receiving antenna, wherein the echo signals comprise signals generated by the first corner reflector or the second corner reflector receiving the transmitting signals of the radar, and parameters of the performance test comprise at least one of the following: distance range, distance resolution, angle range, or angle resolution.

2. The test device of claim 1, wherein the linear rail, the arcuate rail, and the signal emitting platform are disposed on a horizontal plane, the signal emitting platform is rotatable on the horizontal plane, and the signal emitting platform is disposed between the linear rail and the arcuate rail.

3. The test device of claim 1, wherein the radar and the receiving antenna are mounted on opposite sides of the signal transmitting platform, respectively.

4. The test device of claim 1, wherein a linear direction of the linear track is parallel to a central axis of a transmitted signal of the radar, and a distance from the first corner reflector to the central axis of the transmitted signal of the radar is less than or equal to 2.5cm.

5. The test device of claim 1, wherein a circular mandrel of the arcuate track is perpendicular to a central axis of the radar's transmitted signal, and the second corner reflector is less than or equal to 2.5cm from the central axis of the radar's transmitted signal.

6. The test device of claim 1, wherein the radar is disposed on a circular mandrel of the arcuate track.

7. The test device of claim 1, wherein the linear rail comprises a first linear rail for mounting one of the first corner emitters.

8. The test device of claim 7, wherein the linear rail further comprises a second linear rail parallel to the first linear rail, the second linear rail being used for mounting another one of the first corner reflectors, and a distance d ₁ between the two first corner reflectors along the first direction is as follows: d ₁ is more than or equal to 0 and less than or equal to d, wherein d=c/2b, c is the light speed, B is the bandwidth of a transmission signal of the radar, and the first direction is the direction on a plane perpendicular to the linear direction of the linear track.

9. The test device of claim 1, wherein the arcuate track comprises a first arcuate track for mounting one of the second corner reflectors.

10. The test device of claim 9, wherein the arcuate rails further comprise a second arcuate rail parallel to the first arcuate rail, the second arcuate rail for mounting another of the second corner reflectors, a distance d ₂ between the two second corner reflectors in a second direction: d ₂ is less than or equal to 0 and less than or equal to d, wherein d=c/2b, c is the speed of light, B is the bandwidth of the transmitted signal of the radar, and the second direction is parallel to the circular mandrel of the arc track.

11. The test device according to claim 2, wherein the signal transmitting platform is further configured to mount a calibration antenna, the calibration antenna being a horizontally polarized antenna, a vertical dimension antenna of the radar being parallel to a horizontal plane, a distance between the calibration antenna and the radar along a third direction being N times a wavelength of a transmitted signal of the radar, the third direction being parallel to the horizontal plane and perpendicular to a central axis of the transmitted signal of the radar;

the data analysis device is used for performing performance test on the radar according to echo signals respectively received by the radar and the calibration antenna, wherein the echo signals comprise signals generated by the second corner reflector receiving the transmitting signals of the calibration antenna.

12. The test device of claim 1, wherein a position of at least one of the linear rail, the arcuate rail, or the signaling platform is adjustable in a vertical direction and/or a horizontal direction.

13. The test device of claim 1, wherein a position of at least one of the first corner reflector, the second corner reflector, the transmitting antenna, the radar, or the receiving antenna is adjustable in a vertical direction and/or a horizontal direction.

14. The test device of claim 1, wherein the radar is a millimeter wave radar in the 80GHz band.

15. The test device of claim 1, wherein the linear track has a length of 3.7m, the arcuate track has a radius of 1.5m, and the arcuate track has a central angle of 180 °.

16. A darkroom comprising a testing device according to any one of claims 1 to 15, wherein the length and width of the testing darkroom are 8m and 4m, respectively.