CN117914312A - Signal compensation method, device, equipment and storage medium - Google Patents
Signal compensation method, device, equipment and storage medium Download PDFInfo
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- H—ELECTRICITY
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- H03L7/00—Automatic control of frequency or phase; Synchronisation
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Abstract
The application discloses a signal compensation method, a device, equipment and a storage medium. The first relative clock difference is calculated according to the first disciplined time-frequency information, the first disciplined time-frequency information and the first reference time-frequency information, and the second relative clock difference is calculated according to the second disciplined time-frequency information, the second disciplined time-frequency information and the second reference time-frequency information. And then calculating the relative frequency difference according to the first and second relative clock differences and the first and second preset moments, and calculating the compensation clock difference and the compensation time difference by adopting a linear fitting algorithm according to the relative frequency difference. And compensating the signal of the domesticated end outputting the domesticated time-frequency information by using the compensation clock difference and the compensation time difference. The atomic clock at the domesticated end is subjected to signal compensation to offset drift.
Description
Technical Field
The present application relates to the field of atomic clock signal compensation technology, and in particular, to a signal compensation method, apparatus, device, and storage medium.
Background
The atomic clock for watch is used to keep local time, and is usually composed of multiple small bells, and various navigation systems have watch groups. The more cesium of the laboratory, the better the stability of the time scale. However, there is a long-term drift rate due to various aspects of the atomic clock such as element aging. After long periods of operation, whether by a cesium clock, a hydrogen clock or other type of atomic clock, the accuracy may be reduced.
Therefore, how to improve the accuracy of the atomic clock to keep the local time is a technical problem to be solved.
Disclosure of Invention
In view of the above, embodiments of the present application provide a signal compensation method, apparatus, device and storage medium, so as to provide an automatic signal compensation method, thereby saving recognition time and effort and reducing recognition error probability.
In order to solve the above problems, the technical solution provided by the embodiment of the present application is as follows:
a method of signal compensation, the method comprising:
Acquiring first tame time-frequency information, first tame time-frequency information and first reference time-frequency information, and calculating to obtain a first relative clock difference according to the first tame time-frequency information, the first tame time-frequency information and the first reference time-frequency information, wherein the first tame time-frequency information, the first tame time-frequency information and the first reference time-frequency information are all acquired at a first preset time;
Acquiring second tame time-frequency information, second tame time-frequency information and second reference time-frequency information, and calculating to obtain a second relative clock difference according to the second tame time-frequency information, the second tame time-frequency information and the second reference time-frequency information, wherein the second tame time-frequency information, the second tame time-frequency information and the second reference time-frequency information are all acquired at a second preset time; the second preset time is later than the first preset time; the first disciplined time-frequency information and the second disciplined time-frequency information are output by the same disciplined terminal; the first domesticated time-frequency information and the second domesticated time-frequency information are output by the same domesticated end; the first reference time-frequency information and the second reference time-frequency information are output by the same common time-frequency reference terminal;
calculating a relative frequency difference according to the first relative clock difference, the second relative clock difference, the first preset time and the second preset time;
Calculating a compensation clock difference and a compensation time difference by adopting a linear fitting algorithm according to the relative frequency difference;
and carrying out signal compensation on the domesticated end by utilizing the compensation clock difference and the compensation time difference.
In one possible implementation manner, the calculating the first relative clock difference according to the first disciplined time-frequency information, the first disciplined time-frequency information and the first reference time-frequency information includes:
Calculating a relative clock difference between the first tamed time-frequency information and the first reference time-frequency information as a first clock difference, and calculating a relative clock difference between the first tamed time-frequency information and the first reference time-frequency information as a second clock difference;
calculating a relative clock difference between the first clock difference and the second clock difference as a first relative clock difference;
The calculating a second relative clock difference according to the second disciplined time-frequency information, the second disciplined time-frequency information and the second reference time-frequency information includes:
Calculating a relative clock difference between the second tamed time-frequency information and the second reference time-frequency information as a third clock difference, and calculating a relative clock difference between the second tamed time-frequency information and the second reference time-frequency information as a fourth clock difference;
A relative clock difference between the third clock difference and the fourth clock difference is calculated as a second relative clock difference.
In one possible implementation, the calculation formula of the first clock difference, the second clock difference, the third clock difference or the fourth clock difference is:
Wherein TD is the first, second, third, or fourth clock difference; n is the number of satellites co-viewing the domesticated end and the domesticated end, and N is a positive integer; REFGPS i (a) is the clock difference between the tame end and the i satellite tracked by the tame end; REFGPS i (B) is the clock difference between the tamed end and the i satellite tracked by the tamed end.
In one possible implementation, the relative frequency differenceThe calculation formula of (2) is as follows:
Wherein f atomic clock is the output frequency value of the tamed end; f UTC is the output frequency value of the tame end; Δt 2 is at the second relative clock difference; Δt 1 said first relative clock difference; τ is a time difference between the second preset time and the first preset time; Δf is the frequency difference; f is the nominal frequency.
In one possible implementation manner, the signal compensation for the domesticated end by using the compensation clock difference and the compensation time difference includes:
And carrying out signal compensation on the domesticated end by utilizing the compensation clock difference and the compensation time difference through a micro-leaper.
In one possible implementation manner, the signal compensation for the tamed end by using the compensation clock difference includes:
Determining the number of frequency offsets through the compensation clock difference;
Calculating a compensation frequency of frequency difference compensation according to the frequency offset number and a frequency difference compensation formula of the micro-transformer, and performing frequency difference compensation on the domesticated end by using the compensation frequency of the frequency difference compensation, wherein the frequency difference compensation formula is as follows:
Wherein f out is the compensation frequency of the frequency offset compensation; ΔN s is the number of frequency offsets and f ref is the frequency of the input of the micro-transformer.
In one possible implementation manner, the signal compensation for the domesticated end by using the compensation time difference includes:
Determining the relative frequency difference corresponding to the compensation time difference;
calculating the compensation frequency of the time difference compensation according to the relative frequency difference and a time difference compensation formula of the micro-jump device, wherein the time difference compensation formula is as follows:
wherein f is the compensation frequency of time difference compensation; f 1 is the output frequency of the micro-jump device before adjustment; For the relative frequency difference;
and performing time difference compensation on the domesticated end by using the compensation frequency of the time difference compensation.
A signal compensation apparatus, the apparatus comprising:
The first relative clock difference acquisition unit is used for acquiring first tame time-frequency information, first tame time-frequency information and first reference time-frequency information, and calculating to obtain a first relative clock difference according to the first tame time-frequency information, the first tame time-frequency information and the first reference time-frequency information; the first tamed time-frequency information, the first tamed time-frequency information and the first reference time-frequency information are all acquired at a first preset time;
The second relative clock difference acquisition unit is used for acquiring second tame time-frequency information, second tame time-frequency information and second reference time-frequency information, and calculating to obtain second relative clock differences according to the second tame time-frequency information, the second tame time-frequency information and the second reference time-frequency information, wherein the second tame time-frequency information, the second tame time-frequency information and the second reference time-frequency information are all acquired at a second preset time; the second preset time is later than the first preset time; the first disciplined time-frequency information and the second disciplined time-frequency information are output by the same disciplined terminal; the first domesticated time-frequency information and the second domesticated time-frequency information are output by the same domesticated end; the first reference time-frequency information and the second reference time-frequency information are output by the same common time-frequency reference terminal;
A first calculating unit, configured to calculate a relative frequency difference according to the first relative clock difference, the second relative clock difference, the first preset time, and the second preset time;
The linear fitting unit is used for calculating a compensation clock difference and a compensation time difference by adopting a linear fitting algorithm according to the relative frequency difference;
and the signal compensation unit is used for carrying out signal compensation on the domesticated end by utilizing the compensation clock difference and the compensation time difference.
A signal compensation apparatus comprising: the signal compensation system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the signal compensation method when executing the computer program.
A computer readable storage medium having instructions stored therein which, when executed on a terminal device, cause the terminal device to perform a signal compensation method as described above.
From this, the embodiment of the application has the following beneficial effects:
According to the embodiment of the application, first tame time-frequency information and first reference time-frequency information in a first preset time are obtained, first relative clock difference is calculated according to the first tame time-frequency information, the first tame time-frequency information and the first reference time-frequency information, second relative clock difference is calculated according to the second tame time-frequency information, the second tame time-frequency information and the second reference time-frequency information, and relative frequency difference is calculated according to the first relative clock difference, the second relative clock difference, the first preset time and the second preset time. And then, calculating a compensation clock difference and a compensation time difference by adopting a linear fitting algorithm according to the relative frequency difference, and performing signal compensation on the domesticated end outputting the domesticated time-frequency information by utilizing the compensation clock difference and the compensation time difference. According to the method and the device, the first disciplined time-frequency information and the first reference time-frequency information are obtained, and the first relative clock difference is calculated according to the information, so that the time-frequency difference between the disciplined end and the disciplined end can be accurately known. Similarly, the second tame time-frequency information and the second reference time-frequency information are acquired, and the second relative clock difference is calculated, so that the accuracy is further improved. By utilizing a plurality of time-frequency information sources and combining data acquisition in preset time, the reliability of calculating the relative clock difference and the relative frequency difference can be improved. If an abnormality or interference occurs in a certain time-frequency information source, compensation can be performed by means of other information sources, so that the reliability of signal compensation is ensured. Meanwhile, a linear fitting algorithm is adopted to calculate a compensation clock difference and a compensation time difference according to the relative frequency difference, so that accurate compensation of signals can be realized, and drift is counteracted. The accurate compensation can improve the output performance of the tamed time-frequency information, including stability and accuracy.
Drawings
FIG. 1a is a flow chart of a signal compensation method according to an embodiment of the present application;
FIG. 1b is a schematic diagram of RFile files provided in an embodiment of the present application;
FIG. 1c is a schematic diagram of signal compensation according to an embodiment of the present application;
FIG. 1d is a flowchart of an implementation manner of signal compensation for a tamed end using a compensation clock difference according to an embodiment of the present application;
FIG. 1e is a flowchart of an implementation manner of signal compensation for a tamed terminal using compensation time difference according to an embodiment of the present application;
Fig. 2 is a schematic diagram of a signal compensation device according to an embodiment of the present application.
Detailed Description
In order to make the present application better understood by those skilled in the art, the following description will make clear and complete descriptions of the technical solutions of the embodiments of the present application with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In order to facilitate understanding of the technical solution provided by the embodiments of the present application, the following description will first explain the background technology related to the embodiments of the present application.
Atomic clocks play an important role in time keeping. Atomic clocks use the specific transition frequency of an atom as a time reference, and typically use an element such as cesium or hydrogen. These clock sets are made up of a plurality of small cesium or other types of atomic clocks to improve stability and accuracy of the time scale.
However, even with atomic clocks, there is a case where accuracy is lowered after a long-term operation. This is mainly due to long-term drift rate caused by aging of elements in the atomic clock, temperature variations, magnetic field disturbances, etc.
In order to solve the problem, in the embodiment of the application, a signal compensation method, a device, equipment and a storage medium are provided, wherein first disciplined time-frequency information, first disciplined time-frequency information and first reference time-frequency information in a first preset time are obtained, second disciplined time-frequency information and second reference time-frequency information in a second preset time are obtained, first change data of a first version are obtained according to a first code change log, and relative frequency differences are calculated according to first relative clock differences, second relative clock differences, first preset time and second preset time. And then, calculating the compensation clock difference and the compensation time difference by adopting a linear fitting algorithm according to the relative frequency difference. And compensating the signal of the domesticated end outputting the domesticated time-frequency information by using the compensation clock difference and the compensation time difference. The application improves the accuracy, reliability and precision of time-frequency information processing and signal compensation, thereby improving the output quality of the tamed time-frequency information.
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1a, which is a method flowchart of a signal compensation method according to an embodiment of the present application, as shown in fig. 1a, the signal compensation method may include steps S101 to S105:
S101: acquiring first tame time-frequency information, first tame time-frequency information and first reference time-frequency information, and calculating to obtain a first relative clock difference according to the first tame time-frequency information, the first tame time-frequency information and the first reference time-frequency information.
The first tame time-frequency information, the first tame time-frequency information and the first reference time-frequency information are respectively acquired from the tame end, the tame end and the public time-frequency reference end in a first preset time.
The first preset time is earlier than the second preset time, the time interval between the first preset time and the second preset time can be 1 second or 10 minutes, the time interval between the first preset time and the second preset time can be changed according to actual requirements by a user, and the time interval between the first preset time and the second preset time is not particularly limited.
The tame end (DISCIPLINING UNIT) is a device for accurate control and calibration of atomic clocks.
The domesticated end (DISCIPLINED OSCILLATOR) refers to a clock device which can control and calibrate the frequency of an atomic clock through an external signal or a reference signal. The frequency control and calibration of the atomic clock can be realized by performing the frequency control and calibration of the domesticated end.
The domesticated end and the domesticated end are two concepts in time and frequency standard applications, and their main differences are in function and application.
The domesticated end is a clock device which can be controlled and calibrated in frequency by an external signal or a reference signal, and the main function of the domesticated end is to provide a high-precision time reference and a high-precision frequency standard. The domesticated end usually includes a high-precision oscillator, a Phase-Locked Loop (PLL), or other feedback control circuit, and the like, and can be compared with an external reference clock signal and feedback-adjusted to keep its output frequency synchronous with the reference signal, and reduce frequency deviation and drift rate. The domesticated end is widely applied to the fields of precision measurement, communication, navigation, satellite positioning and the like.
The tamer is a signal processing device for receiving external time and frequency reference signals and converting them into signals that can be used to synchronize and calibrate the local clock. The domestic end generally comprises a receiving antenna, a clock extractor, a digital signal processor, a computer and other components, and can acquire high-precision time and frequency signals from satellite systems such as GPS (Global Positioning System ), GLONASS (Global Navigation SATELLITE SYSTEM, global satellite navigation system), beiDou (BeiDou Navigation SATELLITE SYSTEM, beidou satellite navigation system) or other time-frequency reference sources and convert the time and frequency signals into output signals for local application. The tame end is mainly applied to the fields of network synchronization, precision measurement, frequency calibration and the like.
Thus, the domesticated end and the domesticated end differ in function and application, but they are both an integral part of the time and frequency standard application.
The common time-frequency reference end is a common-view satellite between the domesticated end and the domesticated end, and the domesticated end can commonly view a plurality of satellites, which may mean that the system is provided with a plurality of receiving channels or antennas, and can receive signals of a plurality of satellites.
The specific process of the first relative clock difference comprises the following steps:
(1) Acquiring first tame time-frequency information: and acquiring time-frequency information from the tame end at a first preset moment. Such time-frequency information may include parameters such as the local clock frequency of the end, oscillator stability, etc.
(2) Acquiring first disciplined time-frequency information: and acquiring time-frequency information from the tamed end at a first preset moment. Such time-frequency information may include parameters such as the local clock frequency of the end, oscillator stability, etc.
(3) Acquiring first reference time-frequency information: and acquiring time-frequency information from the public time-frequency reference terminal at a first preset moment. These time-frequency information are used as references between the domesticated and the domesticated ends to calculate their relative differences. The common time-frequency reference is typically a reference source shared by multiple satellites or devices.
(4) Calculating a first relative clock difference: and calculating the relative clock difference between the first tamed time-frequency information and the first reference time-frequency information to be used as a first clock difference, and calculating the relative clock difference between the first tamed time-frequency information and the first reference time-frequency information to be used as a second clock difference. The first clock difference is then subtracted from the second clock difference to obtain a first relative clock difference. The first relative clock difference represents the time difference between the tamed end and the tamed end at a first preset time, and their time error relative to the common reference source.
S102: and acquiring second disciplined time-frequency information, second disciplined time-frequency information and second reference time-frequency information, and calculating to obtain a second relative clock difference according to the second disciplined time-frequency information, the second disciplined time-frequency information and the second reference time-frequency information.
The second tame time-frequency information, the second tame time-frequency information and the second reference time-frequency information are respectively acquired from the tame end, the tame end and the public time-frequency reference end in a second preset time. The first and second disciplined time-frequency information are taken from the same disciplined terminal. The first and second disciplined time-frequency information are taken from the same disciplined end. The first reference time-frequency information and the second reference time-frequency information are taken from the same common time-frequency reference terminal. The common time-frequency reference end is a common-view satellite between the domesticated end and the domesticated end.
The second preset time is later than the first preset time, the time interval between the first preset time and the second preset time can be 1 second or 10 minutes, the time interval between the first preset time and the second preset time can be changed according to actual requirements by a user, and the time interval between the first preset time and the second preset time is not particularly limited.
The frequency difference cannot be calculated by only acquiring the time-frequency information at one moment, namely the first preset moment, so that the signal compensation cannot be performed on the domesticated end, and the signal compensation cannot be performed on the atomic clock. If the frequency difference is to be calculated, time-frequency information of another moment, namely a second preset moment, is required to be obtained, so that the relative frequency difference is calculated according to the time-frequency information of the two moments, and the signal compensation is carried out on the domesticated end according to the relative frequency difference.
Likewise, the specific process of the second relative clock difference includes the following steps:
(1) Acquiring second tame time-frequency information: and acquiring time-frequency information from the tame end at a second preset moment. Such time-frequency information may include parameters such as the local clock frequency of the end, oscillator stability, etc.
(2) Acquiring second disciplined time-frequency information: and acquiring time-frequency information from the domesticated end within a second preset time. Such time-frequency information may include parameters such as the local clock frequency of the end, oscillator stability, etc.
(3) Acquiring second reference time-frequency information: and acquiring time-frequency information from the public time-frequency reference terminal at a second preset moment. These time-frequency information are used as references between the domesticated and the domesticated ends to calculate their relative differences. The common time-frequency reference is typically a reference source shared by multiple satellites or devices.
(4) Calculating a second relative clock difference: and calculating the relative clock difference between the second disciplined time-frequency information and the second reference time-frequency information as a third clock difference, and calculating the relative clock difference between the first disciplined time-frequency information and the first reference time-frequency information as a fourth clock difference. The third clock difference is then subtracted from the fourth clock difference to obtain a second relative clock difference. The second relative clock difference represents the time difference between the tamed end and the tamed end at the second preset time and their time error relative to the common reference source.
The first clock difference, the second clock difference, the third clock difference and the fourth clock difference can be calculated by the following formulas:
wherein TD is a first clock difference, a second clock difference, a third clock difference or a fourth clock difference; n is the number of satellites commonly seen by the domesticated end and the domesticated end, and N is a positive integer; REFGPS i (A) is the clock difference of the tame end and the ith satellite tracked by the tame end; REFGPS i (B) is the clock difference of the tamed end and the i satellite tracked by the tamed end.
The clock difference between the local clock of the tame and the i satellite tracked by the tame refers to the difference between the local clock of the tame and the time of the satellite. This difference can be used to correct the local clock at the tamer end to keep pace with the satellite's time.
Specifically, the tamer measures the time of arrival of the satellite signal and compares it to a local clock. Because the signal propagation takes a certain time, the local clock at the tamer may be slightly different from the actual time of the satellite. This difference is the clock difference.
Similarly, the clock difference between the domesticated end and the i satellite tracked by the domesticated end refers to the difference between the local clock of the domesticated end and the time of the i satellite tracked by the domesticated end. This difference can be used to correct the local clock of the disciplined end to keep pace with the satellite's time.
Similar to the tame, the tame calculates the clock bias by measuring the time of arrival of the satellite signal and comparing it to the local clock. Because of the time required for signal propagation, the local clock at the end being tamed may vary slightly from the actual time of the satellite.
In addition, the first clock skew, the second clock skew, the third clock skew, and the fourth clock skew are all transferred and stored in the form of RFile (Resource File) files.
RFile the file format is specifically tailored for NIMDO, which references the standard data file CGGTTS (Combined GPS/GLONASS Geodetic TIME SERIES ) file format. Those skilled in the art will appreciate that other means of file storage and transfer may be employed. In one embodiment of the invention, a RFile file contains clock skew information for one or more satellites in comparison to a local clock.
Referring to fig. 1b, fig. 1b is a schematic diagram of RFile files provided in an embodiment of the present application, wherein a first part of the RFile file is a RFile file header, and the RFile file header records all information that does not change during the measurement process (for example, a data file header, a receiver model, a product number, a version number, a channel number, a laboratory identification, an antenna coordinate reference, an antenna coordinate evaluation, a receiver internal delay value, a cable delay value, a reference delay value, a time reference, etc.). The second part is RFile data, RFile data records data that may change during the measurement process (e.g., pseudo-random code number of satellite (SAT CL), start date julian day of tracking satellite (MJD), start time of tracking Satellite (STTIME), difference between local clock and GPS time at midpoint of actual tracking length (REFGPS), etc.).
Referring to fig. 1c, fig. 1c is a schematic diagram of signal compensation provided in an embodiment of the present application, and the uploading and downloading of RFile files follow the FTP Protocol (FILE TRANSFER Protocol).
The receiver at the domesticated end is the Beidou common view receiver at the domesticated end. The Beidou common view receiver of the domesticated end is a part of the domesticated end and is responsible for receiving Beidou satellite signals and providing data. The upper computer of the domesticated end is a computer or a control system for controlling and monitoring the domesticated end. In the industrial control system, the upper computer at the end to be tamed is responsible for monitoring and managing the whole production process, and the end to be tamed is a part of control and executes instructions from the upper computer.
Similarly, the domesticated end receiver is the Beidou common view receiver of the domesticated end. The Beidou common view receiver at the domestication end is a part of the domestication end and is responsible for receiving Beidou satellite signals and providing data. The upper computer at the domesticated end is a computer or a control system for controlling and monitoring the domesticated end. In the industrial control system, the upper computer of the tame end is responsible for monitoring and managing the whole production process, and the tame end is a part of control and executes instructions from the upper computer.
The micro-jump device is the most accurate instrument for realizing phase micro-jump and frequency accurate correction. The micro-hops may be used to transmit the nominal frequency (e.g., 5 megahertz or 10 megahertz) and phase (i.e., instant time, e.g., 5 PPS) of the atomic clock. PPS represents pulses per second (Pulses Per Second).
In this embodiment, taking an atomic clock as a rubidium clock (a chemical sign bit Rb of rubidium) as an example, after receiving a frequency and a phase sent by UTC (NIM), the host computer at the tame end generates an RFile (B) file and uploads the RFile (B) file to the FTP, wherein a clock difference result Δt UTC(NIM)-GPS of comparing a plurality of GPS satellites with UTC (NIM) is stored in the RFile (B) file, and Δt UTC(NIM)-GPS is stored in a data type of REFGPS (REFERENCE GPS, refer to a GPS receiver) in the RFile file, thereby obtaining REFGPS i (B).
After receiving the nominal frequency and phase of the rubidium clock transmitted by the micro-leaper, the upper computer at the domesticated end also needs to upload the generated RFile (A) file to the FTP, wherein the RFile (A) has a clock difference result delta t Rb-GPS of a plurality of GPS satellites and rubidium Zhong Bi pairs, and the delta t Rb-GPS is still stored in a data type of REFGPS in a RFile file, so that REFGPS i (A) is obtained.
And the upper computer at the domesticated end downloads RFile (B) on the FTP at the same time. The upper computer of the domesticated end is provided with software for processing files and domesticating the controllable atomic clock. The software processes files RFile (A) and RFile (B) generated at the same moment, removes REFGPS data which are not shared in the two files, collects REFGPS data which can be shared, and obtains clock difference TD between a rubidium clock and UTC (NIM) through average.
Wherein N is the number of satellites commonly seen by the domesticated end and the domesticated end, and N is a positive integer; REFGPS i (A) is the clock difference of the tame end and the ith satellite tracked by the tame end; REFGPS i (B) is the clock difference of the tamed end and the i satellite tracked by the tamed end.
The above-mentioned multiple GPS satellites may also be replaced by multiple Beidou system time, so that the clock difference result of the comparison between the Beidou system time and UTC (NIM) is Δt UTC(NIM)- Beidou system time , and the clock difference result of the comparison between the Beidou system time and rubidium Zhong Bi is Δt Rb- Beidou system time .
Among them, UTC is an abbreviation of the coordinated world (Coordinated Universal Time), which is a global universal time standard. NIM is an abbreviation for national time service center (National Institute of Metrology).
S103: and calculating a relative frequency difference according to the first relative clock difference, the second relative clock difference, the first preset time and the second preset time.
The relative frequency offset may be calculated using a first relative clock offset, a second relative clock offset, a first preset time and said second preset time.
Relative frequency differenceThe calculation formula of (2) is as follows:
Wherein f atomic clock is the output frequency value of the domesticated end; f UTC is the output frequency value of the tame end; Δt 2 is at the second relative clock difference; Δt 1 said first relative clock difference; τ is a time difference between the second preset time and the first preset time; Δf is the frequency difference; f is the nominal frequency. The frequency difference refers to the difference between the frequencies of the two clocks. Nominal frequency refers to the theoretical frequency at which an element, device or apparatus is designed and manufactured. If the nominal frequency of a device is 5 mhz, the device is designed to operate normally at an operating frequency of 5 mhz. The nominal frequency may be a theoretical frequency of 5 mhz or 10 mhz, and the nominal frequency may be adjusted by a user according to an actual theoretical frequency, and the size of the nominal frequency is not particularly limited in the present application.
S104: and calculating a compensation clock difference and a compensation time difference by adopting a linear fitting algorithm according to the relative frequency difference.
The relative frequency difference refers to the frequency difference between two different clocks. The relative frequency difference data can be processed and analyzed by adopting a linear fitting algorithm so as to know the change trend of the frequency difference along with time.
The goal of the linear fitting algorithm is to find an optimal line to which to match the actual relative frequency difference data. This line is described by a slope, which represents the rate of change of the frequency difference over time, and an intercept, which represents the initial frequency difference value. From the slope and intercept obtained by the linear fit, the values of the compensation clock difference and the compensation time difference can be calculated. Compensating for clock differences means that for different clocks, the frequency difference is adjusted according to the linear fitting result so as to realize better synchronization performance. The compensation time difference is to adjust the phase difference (i.e. time difference) according to the linear fitting result at different time points so as to achieve better clock synchronization.
In particular, the relative frequency difference data is processed using a linear fitting algorithm, typically a least squares method. This procedure will result in an optimal straight line, minimizing the deviation of this straight line from the actual data. The slope and intercept of the optimal straight line obtained by linear fitting can then be calculated. The slope represents the rate of change of the frequency difference and the intercept represents the initial frequency difference. And then calculating the numerical values of the compensation clock difference and the compensation time difference by utilizing the slope and the intercept and combining the time interval. The slope corresponds to the rate of change of the compensation clock difference and the intercept corresponds to the initial compensation clock difference. Meanwhile, since the slope and the intercept are both related to time, the change condition of the compensation time difference can be calculated according to the change of time.
S105: and carrying out signal compensation on the domesticated end outputting the domesticated time-frequency information by utilizing the compensation clock difference and the compensation time difference.
The micro-jump device is the most accurate instrument for realizing phase micro-jump and frequency accurate correction. The invention plays a main role in completing the calibration of the atomic clock, and realizes the calibration of the output signal of the atomic clock through the micro-jump device and then outputs the output signal through the micro-jump device.
Therefore, the signal compensation can be carried out on the domesticated end by utilizing the compensation clock difference and the compensation time difference through the micro-jump device.
For rubidium clock, the relative frequency difference of rubidium clock and UTC (NIM) can be calculated. In the calibration process, the rubidium clock is not directly regulated, but the signal output by the rubidium clock is compensated by utilizing the micro-jump device, so that the required signal is indirectly obtained. Assuming that the output frequency signal of the rubidium clock is divided into 5 MHz and 10 MHz, the output clock signal of the rubidium clock is 1PPS, the micro-jump device is set by utilizing the compensation clock difference and the compensation time difference in the calibration process, and the input frequency and second signals are subjected to phase and frequency modulation through the micro-jump device, and then the output of the 5 MHz and 1PPS is carried out.
Referring to fig. 1d, fig. 1d is a flowchart of an implementation manner of signal compensation for a tamed end by using a compensation clock difference according to an embodiment of the present application, and a specific implementation manner of signal compensation for a tamed end by using a compensation clock difference may include A1-A2:
A1: the number of frequency offsets is determined by compensating for the clock difference.
A2: and calculating the compensation frequency of the frequency difference compensation according to the frequency offset number and the frequency difference compensation formula of the micro-leapfrog, and carrying out the frequency difference compensation on the domesticated end by utilizing the compensation frequency of the frequency difference compensation.
And performing frequency offset compensation on the domesticated end according to the frequency offset number and a frequency offset compensation formula of the micro-leapfrog, namely performing frequency offset compensation on the atomic clock.
The frequency difference compensation formula is as follows:
Wherein f out is the compensation frequency of the frequency offset compensation; ΔN s is the number of frequency offsets and f ref represents the frequency of the input of the micro-transformer.
Referring to fig. 1e, fig. 1e is a flowchart of an implementation manner of signal compensation for a tamed end by using a compensation time difference, where the implementation manner of signal compensation for a tamed end by using a compensation time difference may include B1-B3:
b1: and determining the relative frequency difference corresponding to the compensation time difference.
The compensation time difference is obtained by linear fitting the relative frequency difference, so that the relative frequency difference can be determined by knowing the compensation time difference.
B2: and calculating the compensation frequency of the time difference compensation according to the relative frequency difference and the time difference compensation formula of the micro-jump device.
The equation of time difference compensation is:
wherein f · is the compensation frequency of the time difference compensation; f 1 is the output frequency of the micro-jump device before adjustment; Is the relative frequency difference.
B3: and performing time difference compensation by using the compensation frequency of the time difference compensation.
And performing time difference compensation on the domesticated end by using the compensation frequency of the time difference compensation, namely performing time difference compensation on the atomic clock.
Based on the content of S101-S105, the method and the device acquire the first disciplined time-frequency information, the first disciplined time-frequency information and the first reference time-frequency information in the first preset time, and calculate the first relative clock difference according to the first disciplined time-frequency information, the first disciplined time-frequency information and the first reference time-frequency information, and calculate the second relative clock difference according to the second disciplined time-frequency information, the second disciplined time-frequency information and the second reference time-frequency information in the second preset time. And then, calculating a relative frequency difference according to the first relative clock difference, the second relative clock difference, the first preset time and the second preset time, and calculating a compensation clock difference and a compensation time difference by adopting a linear fitting algorithm according to the relative frequency difference. And finally, performing signal compensation on the domesticated end outputting the domesticated time-frequency information by using the compensation clock difference and the compensation time difference. According to the method and the device, the first disciplined time-frequency information and the first reference time-frequency information are obtained, and the first relative clock difference is calculated according to the information, so that the time-frequency difference between the disciplined end and the disciplined end can be accurately known. Similarly, the second tame time-frequency information and the second reference time-frequency information are acquired, and the second relative clock difference is calculated, so that the accuracy is further improved. By utilizing a plurality of time-frequency information sources and combining data acquisition in preset time, the reliability of calculating the relative clock difference and the relative frequency difference can be improved. If an abnormality or interference occurs in a certain time-frequency information source, compensation can be performed by means of other information sources, so that the reliability of signal compensation is ensured. Meanwhile, a linear fitting algorithm is adopted to calculate a compensation clock difference and a compensation time difference according to the relative frequency difference, so that accurate compensation of signals can be realized, and drift is counteracted. The accurate compensation can improve the output performance of the tamed time-frequency information, including stability and accuracy.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a signal compensation device according to an embodiment of the present application. As shown in fig. 2, the signal compensation device includes:
A first relative clock difference obtaining unit 201, configured to obtain first tamed time-frequency information, and first reference time-frequency information, and calculate a first relative clock difference according to the first tamed time-frequency information, and the first reference time-frequency information; the first tamed time-frequency information, the first tamed time-frequency information and the first reference time-frequency information are all acquired at a first preset time;
A second relative clock difference obtaining unit 202, configured to obtain second tamed time-frequency information, and second reference time-frequency information, and calculate a second relative clock difference according to the second tamed time-frequency information, and the second reference time-frequency information, where the second tamed time-frequency information, and the second reference time-frequency information are all obtained at a second preset time; the second preset time is later than the first preset time; the first disciplined time-frequency information and the second disciplined time-frequency information are output by the same disciplined terminal; the first domesticated time-frequency information and the second domesticated time-frequency information are output by the same domesticated end; the first reference time-frequency information and the second reference time-frequency information are output by the same common time-frequency reference terminal;
A first calculating unit 203, configured to calculate a relative frequency difference according to the first relative clock difference, the second relative clock difference, the first preset time, and the second preset time;
A linear fitting unit 204, configured to calculate a compensation clock difference and a compensation time difference according to the relative frequency difference by using a linear fitting algorithm;
And the signal compensation unit 205 is configured to perform signal compensation on the tamed end by using the compensated clock difference and the compensated time difference.
In one possible implementation manner, the first relative clock difference acquiring unit 201 includes:
The second calculating unit is used for calculating the relative clock difference between the first tamed time-frequency information and the first reference time-frequency information as a first clock difference and calculating the relative clock difference between the first tamed time-frequency information and the first reference time-frequency information as a second clock difference;
A third calculation unit for calculating a relative clock difference between the first clock difference and the second clock difference as a first relative clock difference.
In one possible implementation, the second relative clock difference acquisition unit 202 includes:
a fourth calculating unit, configured to calculate a relative clock difference between the second tamed time-frequency information and the second reference time-frequency information as a third clock difference, and calculate a relative clock difference between the second tamed time-frequency information and the second reference time-frequency information as a fourth clock difference;
A fifth calculation unit for calculating a relative clock difference between the third clock difference and the fourth clock difference as a second relative clock difference.
In one possible implementation, the calculation formula of the first clock difference, the second clock difference, the third clock difference or the fourth clock difference is:
Wherein TD is the first, second, third, or fourth clock difference; n is the number of satellites co-viewing the domesticated end and the domesticated end, and N is a positive integer; REFGPS i (a) is the clock difference between the tame end and the i satellite tracked by the tame end; REFGPS i (B) is the clock difference between the tamed end and the i satellite tracked by the tamed end.
In one possible implementation, the relative frequency differenceThe calculation formula of (2) is as follows:
Wherein f atomic clock is the output frequency value of the tamed end; fUTC is the output frequency value of the tame end; Δt 2 is at the second relative clock difference; Δt 1 said first relative clock difference; τ is a time difference between the second preset time and the first preset time; Δf is the frequency difference; f is the nominal frequency.
In one possible implementation manner, the signal compensation unit 205 specifically includes:
And the micro-leapfrog signal compensation unit is used for carrying out signal compensation on the domesticated end by utilizing the compensation clock difference and the compensation time difference through the micro-leapfrog.
In one possible implementation, the signal compensation unit 205 further includes:
a first determining unit, configured to determine the number of frequency offsets by the compensated clock difference;
The frequency offset compensation unit is used for calculating the compensation frequency of the frequency offset compensation according to the frequency offset number and the frequency offset compensation formula of the micro-transformer, and performing frequency offset compensation on the domesticated terminal by utilizing the compensation frequency of the frequency offset compensation, wherein the frequency offset compensation formula is as follows:
Wherein f out is the compensation frequency of the frequency offset compensation; ΔN s is the number of frequency offsets and f ref is the frequency of the input of the micro-transformer.
In one possible implementation, the signal compensation unit 205 further includes:
The second determining unit is used for determining the relative frequency difference corresponding to the compensation time difference;
A sixth calculating unit, configured to calculate a compensation frequency of the time difference compensation according to the relative frequency difference and a time difference compensation formula of the micro-transformer, where the time difference compensation formula is:
wherein f · is the compensation frequency of the time difference compensation; f 1 is the output frequency of the micro-jump device before adjustment; For the relative frequency difference;
and the time difference compensation unit is used for performing time difference compensation on the domesticated end by using the compensation frequency of the time difference compensation.
In addition, the embodiment of the application also provides a signal compensation device, which comprises: the signal compensation system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the signal compensation method when executing the computer program.
In addition, the embodiment of the application also provides a computer readable storage medium, wherein the computer readable storage medium stores instructions, when the instructions are executed on the terminal equipment, the terminal equipment is caused to execute the signal compensation method.
The embodiment of the application provides an attack behavior detection device, which comprises the steps of firstly, acquiring first tamed time-frequency information, first tamed time-frequency information and first reference time-frequency information by using a first relative clock difference acquisition unit 201, and calculating to obtain the first relative clock difference according to the first tamed time-frequency information, the first tamed time-frequency information and the first reference time-frequency information; and acquiring second disciplined time-frequency information, second disciplined time-frequency information and second reference time-frequency information by using the second relative clock difference acquisition 202, and calculating to obtain the second relative clock difference according to the second disciplined time-frequency information, the second disciplined time-frequency information and the second reference time-frequency information. The first calculating unit 203 calculates the relative frequency difference according to the first relative clock difference, the second relative clock difference, the first preset time and the second preset time. And then, calculating the compensation clock difference and the compensation time difference by using a linear fitting unit 204 according to the relative frequency difference by using a linear fitting algorithm, so that the signal compensation unit 205 can perform signal compensation on the domesticated end by using the compensation clock difference and the compensation time difference. According to the method and the device, the first disciplined time-frequency information and the first reference time-frequency information are obtained, and the first relative clock difference is calculated according to the information, so that the time-frequency difference between the disciplined end and the disciplined end can be accurately known. Similarly, the second tame time-frequency information and the second reference time-frequency information are acquired, and the second relative clock difference is calculated, so that the accuracy is further improved. By utilizing a plurality of time-frequency information sources and combining data acquisition in preset time, the reliability of calculating the relative clock difference and the relative frequency difference can be improved. If an abnormality or interference occurs in a certain time-frequency information source, compensation can be performed by means of other information sources, so that the reliability of signal compensation is ensured. Meanwhile, a linear fitting algorithm is adopted to calculate a compensation clock difference and a compensation time difference according to the relative frequency difference, so that accurate compensation of signals can be realized, and drift is counteracted. The accurate compensation can improve the output performance of the tamed time-frequency information, including stability and accuracy.
It should be noted that, in the present description, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system or device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant points refer to the description of the method section.
It should be understood that in the present application, "at least one (item)" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "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 and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of signal compensation, the method comprising:
Acquiring first tame time-frequency information, first tame time-frequency information and first reference time-frequency information, and calculating to obtain a first relative clock difference according to the first tame time-frequency information, the first tame time-frequency information and the first reference time-frequency information, wherein the first tame time-frequency information, the first tame time-frequency information and the first reference time-frequency information are all acquired at a first preset time;
Acquiring second tame time-frequency information, second tame time-frequency information and second reference time-frequency information, and calculating to obtain a second relative clock difference according to the second tame time-frequency information, the second tame time-frequency information and the second reference time-frequency information, wherein the second tame time-frequency information, the second tame time-frequency information and the second reference time-frequency information are all acquired at a second preset time; the second preset time is later than the first preset time; the first disciplined time-frequency information and the second disciplined time-frequency information are output by the same disciplined terminal; the first domesticated time-frequency information and the second domesticated time-frequency information are output by the same domesticated end; the first reference time-frequency information and the second reference time-frequency information are output by the same common time-frequency reference terminal;
calculating a relative frequency difference according to the first relative clock difference, the second relative clock difference, the first preset time and the second preset time;
Calculating a compensation clock difference and a compensation time difference by adopting a linear fitting algorithm according to the relative frequency difference;
and carrying out signal compensation on the domesticated end by utilizing the compensation clock difference and the compensation time difference.
2. The method of claim 1, wherein the calculating a first relative clock difference from the first tamed time-frequency information, and the first reference time-frequency information comprises:
Calculating a relative clock difference between the first tamed time-frequency information and the first reference time-frequency information as a first clock difference, and calculating a relative clock difference between the first tamed time-frequency information and the first reference time-frequency information as a second clock difference;
calculating a relative clock difference between the first clock difference and the second clock difference as a first relative clock difference;
The calculating a second relative clock difference according to the second disciplined time-frequency information, the second disciplined time-frequency information and the second reference time-frequency information includes:
Calculating a relative clock difference between the second tamed time-frequency information and the second reference time-frequency information as a third clock difference, and calculating a relative clock difference between the second tamed time-frequency information and the second reference time-frequency information as a fourth clock difference;
A relative clock difference between the third clock difference and the fourth clock difference is calculated as a second relative clock difference.
3. The method according to claim 2, wherein the first, second, third, or fourth clock differences are calculated as:
Wherein TD is the first, second, third, or fourth clock difference; n is the number of satellites co-viewing the domesticated end and the domesticated end, and N is a positive integer; REFGPS i (a) is the clock difference between the tame end and the i satellite tracked by the tame end; REFGPS i (B) is the clock difference between the tamed end and the i satellite tracked by the tamed end.
4. The method of claim 1, wherein the relative frequency differenceThe calculation formula of (2) is as follows:
Wherein f atomic clock is the output frequency value of the tamed end; f UTC is the output frequency value of the tame end; Δt 2 is at the second relative clock difference; Δt 1 said first relative clock difference; τ is a time difference between the second preset time and the first preset time; Δf is the frequency difference; f is the nominal frequency.
5. The method of claim 1, wherein said compensating the signal at the tamed end using the compensation clock difference and the compensation time difference comprises:
And carrying out signal compensation on the domesticated end by utilizing the compensation clock difference and the compensation time difference through a micro-leaper.
6. The method of claim 1, wherein compensating the signal at the tamed end with the compensation clock bias comprises:
Determining the number of frequency offsets through the compensation clock difference;
Calculating a compensation frequency of frequency difference compensation according to the frequency offset number and a frequency difference compensation formula of the micro-transformer, and performing frequency difference compensation on the domesticated end by using the compensation frequency of the frequency difference compensation, wherein the frequency difference compensation formula is as follows:
Wherein f out is the compensation frequency of the frequency offset compensation; ΔN s is the number of frequency offsets and f ref is the frequency of the input of the micro-transformer.
7. The method of claim 1, wherein compensating the signal at the tamed end using the compensation time difference comprises:
Determining the relative frequency difference corresponding to the compensation time difference;
calculating the compensation frequency of the time difference compensation according to the relative frequency difference and a time difference compensation formula of the micro-jump device, wherein the time difference compensation formula is as follows:
wherein f · is the compensation frequency of the time difference compensation; f 1 is the output frequency of the micro-jump device before adjustment; For the relative frequency difference;
and performing time difference compensation on the domesticated end by using the compensation frequency of the time difference compensation.
8. A signal compensation device, the device comprising:
The first relative clock difference acquisition unit is used for acquiring first tame time-frequency information, first tame time-frequency information and first reference time-frequency information, and calculating to obtain a first relative clock difference according to the first tame time-frequency information, the first tame time-frequency information and the first reference time-frequency information; the first tamed time-frequency information, the first tamed time-frequency information and the first reference time-frequency information are all acquired at a first preset time;
The second relative clock difference acquisition unit is used for acquiring second tame time-frequency information, second tame time-frequency information and second reference time-frequency information, and calculating to obtain second relative clock differences according to the second tame time-frequency information, the second tame time-frequency information and the second reference time-frequency information, wherein the second tame time-frequency information, the second tame time-frequency information and the second reference time-frequency information are all acquired at a second preset time; the second preset time is later than the first preset time; the first disciplined time-frequency information and the second disciplined time-frequency information are output by the same disciplined terminal; the first domesticated time-frequency information and the second domesticated time-frequency information are output by the same domesticated end; the first reference time-frequency information and the second reference time-frequency information are output by the same common time-frequency reference terminal;
A first calculating unit, configured to calculate a relative frequency difference according to the first relative clock difference, the second relative clock difference, the first preset time, and the second preset time;
The linear fitting unit is used for calculating a compensation clock difference and a compensation time difference by adopting a linear fitting algorithm according to the relative frequency difference;
and the signal compensation unit is used for carrying out signal compensation on the domesticated end by utilizing the compensation clock difference and the compensation time difference.
9. A signal compensation apparatus, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the signal compensation method according to any one of claims 1-7 when the computer program is executed.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein instructions, which when run on a terminal device, cause the terminal device to perform the signal compensation method according to any of claims 1-7.
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