Method and system for detecting time-frequency stability of observation station
By introducing the third station to deep space exploration for three stations in joint interference measurement and tracking, the error problem caused by the instability of the station time frequency system is solved, and effective detection and abnormal positioning of the time frequency system of the measurement and control network is realized, ensuring the efficient execution of the detector measurement and control tasks.
Patent Information
- Application Number
- CN202411818566.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-03-25
AI Technical Summary
In deep space exploration, the instability and frequency offset of the station time frequency system lead to errors in the Doppler speed measurement results, and when the station time frequency equipment encounters abnormalities, it is difficult to conduct effective positioning and inspection.
By introducing the third station, the three stations are jointly interferometric measurement tracking, the problem station is checked, and the frequency of the received frequency signal and forecast data of the station is compared and analyzed to judge the consistency of the problem station's investigation results.
Effectively perform routine detection and abnormal positioning of the time and frequency system of the measurement and control network to ensure the effective execution of the detector measurement and control tasks, and improve the accuracy and reliability of measurement.
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Figure CN119689521A_ABST
Abstract
Description
Background Art
[0002] Very long baseline interferometry and velocity measurement are two important measurement contents in deep space exploration, and in both measurements, the time-frequency reference is an important system component. Clock instability and frequency offset are important error terms in Doppler velocity measurement results; clock instability is also an important error source in interferometry technology, which will be modeled in data processing. The accuracy of the model may even lead to the inability to perform effective data processing, resulting in invalid measurements.
[0003] When an abnormality occurs in the time and frequency equipment of a measuring station, it is difficult to locate and troubleshoot the relevant problem locally. In addition, since the two-way speed measurement technology uses the same station as a reference, it is also difficult to troubleshoot the clock deviation of the time and frequency system. Summary of the invention
[0004] The present application provides a method and system for detecting the time-frequency stability of a measuring station, so as to achieve the purpose of detecting whether the time-frequency system of the measuring station is abnormal or not.
[0005] In a first aspect, a method for detecting time-frequency stability of a measuring station is provided, comprising the following steps:
[0006] By introducing a third measuring station, three-station joint interferometric measurement tracking is performed to troubleshoot the problematic measuring station and obtain the troubleshooting results of the problematic measuring station;
[0007] The frequency of the frequency signal received by the measuring station is compared and analyzed with the forecast data, and the consistency of the troubleshooting results of the problem measuring station is judged.
[0008] In the above technical scheme, by introducing a third measuring station, three-station joint interferometric measurement tracking is carried out to check the problem measuring station and obtain the checking result of the problem measuring station; the frequency of the frequency signal received by the measuring station is compared and analyzed with the forecast data, and the consistency of the checking result of the problem measuring station is judged; the time and frequency system of the measurement and control network can be effectively tested and abnormalities can be located, which provides important guarantee for the effective execution of the measurement and control tasks of the detector.
[0009] In a specific implementation scheme, based on the two-way and three-way Doppler speed measurement methods, the frequency of the station receiving frequency signal is compared and analyzed with the forecast data, and the consistency of the problem station troubleshooting results is judged.
[0010] In a specific implementation scheme, by introducing a third measuring station, performing three-station joint interferometric measurement tracking, troubleshooting the problematic measuring station, and obtaining the troubleshooting results of the problematic measuring station, the specific steps are:
[0011] By introducing a third measuring station and carrying out joint interferometric measurement and tracking of the spacecraft based on the pitch information of the probe provided by the measuring station, and cross-processing the data, the problematic measuring station is checked and the troubleshooting results of the problematic measuring station are obtained.
[0012] In a specific implementation scheme, the steps of comparing and analyzing the frequency of the station receiving frequency signal with the forecast data and judging the consistency of the problem station troubleshooting results specifically include:
[0013] Judging the tracking status of the measuring station based on the spectrum of the signal received by the measuring station;
[0014] Conduct three-way and two-way Doppler velocity measurement on the measuring station;
[0015] Predict the nominal theoretical values of the two-way and three-way Doppler receiving frequencies of the measuring station to obtain the theoretical predicted values;
[0016] The frequency of the downlink receiving signal received by the measuring station is extracted and compared with the theoretical predicted value, and the consistency of the troubleshooting result of the problematic measuring station is judged.
[0017] In a specific feasible implementation scheme, if the downlink reception of the measuring station is normal, a fringe search is performed on the abnormal baseline-related data according to the residual delay rate of the detector to determine the correctness of the signal acquisition and the detector tracking.
[0018] In a specific implementation scheme, different measuring stations are used in a cross-rotation manner to lock the uplink frequency of the detector, and three-way and two-way Doppler velocity measurements are performed on the measuring stations.
[0019] In a specific implementation scheme, the nominal theoretical values of the two-way and three-way Doppler receiving frequencies of the measuring station are predicted based on the detector ephemeris information.
[0020] In a specific implementation scheme, if the data processing result of one of the baselines formed by the three measuring stations is abnormal, a fringe search is performed based on the detector signal.
[0021] In a specific implementation scheme, the Doppler nominal prediction of the station receiving signal is performed based on the detector ephemeris, the uplink station address, the receiving station address and the nominal frequency.
[0022] In a second aspect, a station time-frequency stability detection system is provided, comprising:
[0023] The problem station troubleshooting module is used to introduce a third station to conduct three-station joint interferometric measurement tracking, troubleshoot the problem station, and obtain the problem station troubleshooting results;
[0024] The consistency judgment module is used to compare and analyze the frequency of the frequency signal received by the measuring station with the forecast data, and to judge the consistency of the troubleshooting results of the problem measuring station.
[0025] In the above technical scheme, by introducing a third measuring station, three-station joint interferometric measurement tracking is carried out to check the problem measuring station and obtain the checking result of the problem measuring station; the frequency of the frequency signal received by the measuring station is compared and analyzed with the forecast data, and the consistency of the checking result of the problem measuring station is judged; the time and frequency system of the measurement and control network can be effectively tested and abnormalities can be located, which provides important guarantee for the effective execution of the measurement and control tasks of the detector. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 A flowchart of a method for detecting time-frequency stability of a measuring station provided in an embodiment of the present application;
[0027] Figure 2 A structural block diagram of a station time-frequency stability detection system provided in an embodiment of the present application;
[0028] Figure 3 An algorithm flow chart for station time-frequency system detection provided in an embodiment of the present application;
[0029] Figure 4 A spectrum diagram of a signal actually received by a station provided in an embodiment of the present application;
[0030] Figure 5 A schematic diagram of the cross-correlation data processing of baseline 1 provided in an embodiment of the present application;
[0031] Figure 6 A schematic diagram of the baseline 2 cross-correlation data processing provided in an embodiment of the present application;
[0032] Figure 7 A schematic diagram of the baseline 3 interferometric measurement data processing provided in an embodiment of the present application;
[0033] Figure 8 A residual frequency diagram of the uplink of the measuring station provided in the embodiment of the present application;
[0034] Fig. 9 A schematic diagram showing interference fringes appearing on each baseline after compensation provided in an embodiment of the present application. DETAILED DESCRIPTION
[0035] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.
[0036] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.
[0037] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
[0038] To facilitate understanding of the station time-frequency stability detection method and system provided in the embodiment of the present application, its application scenario is first explained. The station time-frequency stability detection method and system provided in the embodiment of the present application are used to achieve the purpose of detecting whether the station time-frequency system is abnormal or not. Very long baseline interferometry technology and velocity measurement technology are two important measurement contents in deep space exploration, and in both measurements, the time-frequency reference is an important system component. Clock instability and frequency offset are important error terms in Doppler velocity measurement results; similarly, clock instability is also an important error source of interferometry technology, which will be modeled in data processing. The accuracy of the model may even lead to the inability to perform effective data processing, resulting in invalid measurement. When the station time-frequency equipment is abnormal, it is difficult to locate and troubleshoot related problems locally, and the two-way velocity measurement technology uses the same station as the reference, and it is also difficult to troubleshoot the clock deviation of the time-frequency system. For this reason, the embodiment of the present application provides a station time-frequency stability detection method and system to achieve the purpose of detecting whether the station time-frequency system is abnormal or not. The following is a detailed description of the embodiment in conjunction with specific drawings.
[0039] refer to Figures 1 to 9 , Figure 1 A flowchart of a method for detecting time-frequency stability of a measuring station provided in an embodiment of the present application; Figure 2 A structural block diagram of a station time-frequency stability detection system provided in an embodiment of the present application; Figure 3 An algorithm flow chart for station time-frequency system detection provided in an embodiment of the present application; Figure 4 A spectrum diagram of a signal actually received by a station provided in an embodiment of the present application; Figure 5 A schematic diagram of the cross-correlation data processing of baseline 1 provided in an embodiment of the present application; Figure 6 A schematic diagram of the baseline 2 cross-correlation data processing provided in an embodiment of the present application; Figure 7 A schematic diagram of the baseline 3 interferometric measurement data processing provided in an embodiment of the present application; Figure 8 A residual frequency diagram of the uplink of the measuring station provided in the embodiment of the present application; Fig. 9 A schematic diagram showing interference fringes appearing on each baseline after compensation provided in an embodiment of the present application.
[0040] exist Figure 1 In the embodiment of the present application, a method for detecting time-frequency stability of a measuring station is provided, comprising the following steps:
[0041] By introducing a third measuring station, three-station joint interferometric measurement tracking is performed to troubleshoot the problematic measuring station and obtain the troubleshooting results of the problematic measuring station;
[0042] The frequency of the frequency signal received by the measuring station is compared and analyzed with the forecast data, and the consistency of the troubleshooting results of the problem measuring station is judged.
[0043] In the above technical scheme, by introducing a third measuring station, three-station joint interferometric measurement tracking is carried out to check the problem measuring station and obtain the checking result of the problem measuring station; the frequency of the frequency signal received by the measuring station is compared and analyzed with the forecast data, and the consistency of the checking result of the problem measuring station is judged; the time and frequency system of the measurement and control network can be effectively tested and abnormalities can be located, which provides important guarantee for the effective execution of the measurement and control tasks of the detector.
[0044] In a specific implementation scheme, based on the two-way and three-way Doppler speed measurement methods, the frequency of the station receiving frequency signal is compared and analyzed with the forecast data, and the consistency of the problem station troubleshooting results is judged.
[0045] In a specific implementation scheme, by introducing a third measuring station, performing three-station joint interferometric measurement tracking, troubleshooting the problematic measuring station, and obtaining the troubleshooting results of the problematic measuring station, the specific steps are:
[0046] By introducing a third measuring station and carrying out joint interferometric measurement and tracking of the spacecraft based on the pitch information of the probe provided by the measuring station, and cross-processing the data, the problematic measuring station is checked and the troubleshooting results of the problematic measuring station are obtained.
[0047] In a specific implementation scheme, the steps of comparing and analyzing the frequency of the station receiving frequency signal with the forecast data and judging the consistency of the problem station troubleshooting results specifically include:
[0048] Judging the tracking status of the measuring station based on the spectrum of the signal received by the measuring station;
[0049] Conduct three-way and two-way Doppler velocity measurement on the measuring station;
[0050] Predict the nominal theoretical values of the two-way and three-way Doppler receiving frequencies of the measuring station to obtain the theoretical predicted values;
[0051] The frequency of the downlink receiving signal received by the measuring station is extracted and compared with the theoretical predicted value, and the consistency of the troubleshooting result of the problematic measuring station is judged.
[0052] In a specific feasible implementation scheme, if the downlink reception of the measuring station is normal, a fringe search is performed on the abnormal baseline-related data according to the residual delay rate of the detector to determine the correctness of the signal acquisition and the detector tracking.
[0053] In a specific implementation scheme, different measuring stations are used in a cross-rotation manner to lock the uplink frequency of the detector, and three-way and two-way Doppler velocity measurements are performed on the measuring stations.
[0054] In a specific implementation scheme, the nominal theoretical values of the two-way and three-way Doppler receiving frequencies of the measuring station are predicted based on the detector ephemeris information.
[0055] In a specific implementation scheme, if the data processing result of one of the baselines formed by the three measuring stations is abnormal, a fringe search is performed based on the detector signal.
[0056] In a specific implementation scheme, the Doppler nominal prediction of the station receiving signal is performed based on the detector ephemeris, the uplink station address, the receiving station address and the nominal frequency.
[0057] refer to Figures 3 to 9 , the station time-frequency stability detection method provides a station time-frequency equipment abnormality detection method based on interferometric measurement technology and two-way and three-way Doppler technology. In multi-station joint interferometric measurement observations and other radio measurements of detectors, the accuracy of time and frequency is an important guarantee for measurement accuracy. This application first introduces a three-station interferometric measurement mode, and performs cross-correlation processing on the data collected by the three stations in pairs to detect the station time-frequency system; if the correlation processing result is abnormal, the uplink carrier is sent to the detector in turn, and the station records and extracts the downlink Doppler information of the receiving detector; the precise ephemeris of the detector and the station address and downlink nominal frequency point information are used to predict the downlink frequency received by the station; the difference between the downlink frequency of the received signal of each station and the nominal prediction is compared to achieve the purpose of detecting whether the station time-frequency system is abnormal.
[0058] refer to Figure 3 The station time-frequency stability detection method specifically comprises the following steps:
[0059] 1) When an abnormality occurs in the interferometric measurement task or velocity measurement task of the measuring station, or to detect whether the time and frequency system of the measuring station is normal, a third measuring station is introduced to organize joint detector interferometric measurement tracking;
[0060] 2) Confirm the pointing state of the measuring station through the autocorrelation spectrum characteristics of the receiving signal of the measuring station; perform cross-correlation processing on the receiving signal data of the three stations;
[0061] 3) Determine the correctness of the cross-correlation processing. If the three-baseline interferometric measurement results are normal, it can be determined that the time-frequency system of the three measuring stations is normal; if one baseline of the measurement results is normal, it can be determined that the two stations are normal, and the abnormal measuring station is another measuring station;
[0062] 4) Use the three measuring stations to load the uplink carrier to the detector in turn and lock it.
[0063] 5) Collect the frequency of the signal received by the measuring station and perform frequency extraction;
[0064] 6) Perform two-way and three-way Doppler prediction based on the detector's precise ephemeris, uplink nominal frequency, and station location;
[0065] 7) Compare and analyze the extracted station receiving frequency value with the nominal Doppler prediction value;
[0066] 8) Based on the comparison results, determine whether the station’s time and frequency system is normal.
[0067] refer to Figure 4 When the time and frequency of a certain measuring station is abnormal and it is difficult to troubleshoot the relevant problems locally, the algorithm of the present invention is used to troubleshoot the problems, as follows: organize three stations to open and jointly conduct detector interferometric measurement and tracking, where the detector downlink main carrier is a sidetone signal with a frequency division ratio of 1 / 600. Figure 4 It can be seen that the three measuring stations all received the signals normally, from which it can be judged that the pointing accuracy of the three measuring stations basically meets the mission requirements.
[0068] refer to Figures 5 to 7 , introducing three-station interferometry, Figures 5 to 7 As can be seen from the figure, the interference fringes of the two stations in the cross-correlation data processing of baseline 1 are normal, and there are no fringes on the other two baselines, so the abnormal stations can be located.
[0069] refer to Figure 8 , the residual delay rate of the station is estimated using the detector DOR beacon signal. Figure 8 It can be seen that the residual frequency of station 3 is one order of magnitude larger than that of station 1 and station 2.
[0070] refer to Fig. 9 , the residual delay rate of the abnormal measuring station is compensated according to its residual frequency value, and the compensation amount is 5.4e-9s / s (the daily compensation amount is 1e-12s / s, which is three orders of magnitude higher than the daily level). After compensation, interference fringes appear on all baselines.
[0071] In this embodiment, this method can be used to effectively perform routine detection and abnormal location of the measurement and control network time and frequency system before large-scale missions, providing important guarantees for the effective execution of the detector measurement and control mission. In future deep space exploration missions, this application can be applied to the time and frequency status inspection and performance evaluation of the measurement and control station equipment to provide effective three-way and two-way measurement data to better complete space exploration missions.
[0072] In the above technical scheme, by introducing a third measuring station, three-station joint interferometric measurement tracking is carried out to check the problem measuring station and obtain the checking result of the problem measuring station; the frequency of the frequency signal received by the measuring station is compared and analyzed with the forecast data, and the consistency of the checking result of the problem measuring station is judged; the time and frequency system of the measurement and control network can be effectively tested and abnormalities can be located, which provides important guarantee for the effective execution of the measurement and control tasks of the detector.
[0073] exist Figure 2In the embodiment of the present application, a station time-frequency stability detection system is provided, comprising:
[0074] The problem station troubleshooting module is used to introduce a third station to conduct three-station joint interferometric measurement tracking, troubleshoot the problem station, and obtain the problem station troubleshooting results;
[0075] The consistency judgment module is used to compare and analyze the frequency of the frequency signal received by the measuring station with the forecast data, and to judge the consistency of the troubleshooting results of the problem measuring station.
[0076] In the above technical scheme, by introducing a third measuring station, three-station joint interferometric measurement tracking is carried out to check the problem measuring station and obtain the checking result of the problem measuring station; the frequency of the frequency signal received by the measuring station is compared and analyzed with the forecast data, and the consistency of the checking result of the problem measuring station is judged; the time and frequency system of the measurement and control network can be effectively tested and abnormalities can be located, which provides important guarantee for the effective execution of the measurement and control tasks of the detector.
[0077] Those skilled in the art will appreciate that the present application may be implemented as a system, method or computer program product.
[0078] Therefore, the present disclosure may be specifically implemented in the following forms, namely: it may be completely hardware, it may be completely software (including firmware, resident software, microcode, etc.), or it may be a combination of hardware and software, generally referred to herein as a "circuit", "module" or "system". In addition, in some embodiments, the present application may also be implemented in the form of a computer program product in one or more computer-readable media, and the computer-readable medium may contain computer-readable program code.
[0079] Any combination of one or more computer-readable media can be used. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this document, computer-readable storage media can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.
[0080] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art can change, modify, replace and modify the above embodiments within the scope of the present application. On this basis, a variety of replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.
Claims
1. A method for detecting time-frequency stability of a measuring station, characterized in that: The following steps are involved: By introducing a third measuring station, three-station joint interferometric measurement tracking is performed to troubleshoot the problematic measuring station and obtain the troubleshooting results of the problematic measuring station; The frequency of the frequency signal received by the measuring station is compared and analyzed with the forecast data, and the consistency of the troubleshooting results of the problem measuring station is judged.
2. The station time-frequency stability detection method according to claim 1 is characterized in that: Based on the two-way and three-way Doppler speed measurement methods, the frequency of the receiving frequency signal of the measuring station is compared and analyzed with the forecast data, and the consistency of the troubleshooting results of the problematic measuring station is judged.
3. The station time-frequency stability detection method according to claim 2 is characterized in that: By introducing a third measuring station, conducting three-station joint interferometric measurement tracking, troubleshooting the problematic measuring station, and obtaining the troubleshooting results of the problematic measuring station, the specific steps are as follows: By introducing a third measuring station and carrying out joint interferometric measurement and tracking of the spacecraft based on the pitch information of the probe provided by the measuring station, and cross-processing the data, the problematic measuring station is checked and the troubleshooting results of the problematic measuring station are obtained.
4. The station time-frequency stability detection method according to claim 3 is characterized in that: The steps of comparing and analyzing the frequency of the station receiving frequency signal with the forecast data and judging the consistency of the problem station troubleshooting results specifically include: Judging the tracking status of the measuring station based on the spectrum of the signal received by the measuring station; Conduct three-way and two-way Doppler velocity measurement on the measuring station; Predict the nominal theoretical values of the two-way and three-way Doppler receiving frequencies of the measuring station to obtain the theoretical predicted values; The frequency of the downlink receiving signal received by the measuring station is extracted and compared with the theoretical predicted value, and the consistency of the troubleshooting result of the problematic measuring station is judged.
5. The station time-frequency stability detection method according to claim 4 is characterized in that: If the downlink reception of the measuring station is normal, a fringe search is performed on the data related to the observed abnormal baseline according to the residual delay rate of the detector to determine the correctness of the signal acquisition and detector tracking.
6. The station time-frequency stability detection method according to claim 5, characterized in that: The detector is locked to the uplink frequency by using different measuring stations in a cross-rotation manner, and three-way and two-way Doppler velocity measurements are performed on the measuring stations.
7. The station time-frequency stability detection method according to claim 6, characterized in that: The nominal theoretical values of the two-way and three-way Doppler receiving frequencies of the measuring station are predicted based on the detector ephemeris information.
8. The station time-frequency stability detection method according to claim 7, characterized in that: If the data processing result of one of the baselines formed by the three measuring stations is abnormal, a fringe search will be carried out based on the detector signal.
9. The station time-frequency stability detection method according to claim 8, characterized in that: The Doppler nominal prediction of the received signal at the measuring station is made based on the detector ephemeris, the uplink station address, the receiving station address and the nominal frequency.
10. A station time-frequency stability detection system, characterized in that: include: The problem station troubleshooting module is used to introduce a third station to conduct three-station joint interferometric measurement tracking, troubleshoot the problem station, and obtain the problem station troubleshooting results; The consistency judgment module is used to compare and analyze the frequency of the frequency signal received by the measuring station with the forecast data, and to judge the consistency of the troubleshooting results of the problem measuring station.