A low-orbit satellite module electromagnetic interference intelligent diagnosis test method and system

Abstract

The application discloses a kind of low-orbit satellite module electromagnetic interference intelligent diagnosis test method and system, it is related to electromagnetic interference test technical field.The low-orbit satellite module electromagnetic interference intelligent diagnosis test method includes: electromagnetic interference signal frequency deviation evaluation;Electromagnetic interference signal reception evaluation;Electromagnetic interference signal positioning accuracy evaluation.In the process of low-orbit satellite module electromagnetic interference collection, the present application is executed electromagnetic interference signal frequency deviation evaluation to judge whether electromagnetic interference frequency deviation optimization is carried out;Electromagnetic interference signal reception evaluation is executed to judge whether electromagnetic interference signal positioning accuracy evaluation is carried out;Electromagnetic interference signal positioning accuracy evaluation is executed to judge whether electromagnetic interference signal positioning optimization is carried out, the effect of improving low-orbit satellite module electromagnetic interference intelligent diagnosis test accuracy is realized, solve the problem that existing technology exists due to Doppler frequency deviation and leads to low-orbit satellite module electromagnetic interference intelligent diagnosis test accuracy low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic interference test, and particularly relates to a low-orbit satellite module electromagnetic interference intelligent diagnosis test method and system. BACKGROUND

[0002] In the process of low-orbit satellite module electromagnetic interference intelligent diagnosis test, the process includes collection of electromagnetic interference signals and construction of electromagnetic interference database, wherein the low-orbit satellite module includes radio frequency signal processing, phased array antenna, power management unit, etc. In the process of collecting electromagnetic interference signals, the satellite connects a multi-channel spectrum analyzer through deployment of a multi-channel antenna array, such as a phased array antenna, synchronously collects electromagnetic interference signals of different channels, different frequency bands or spatial directions by setting different distances, angles, polarization modes and other conditions of the multi-channel antenna array, to obtain original electromagnetic interference signals, the radio frequency signal processing receives the original electromagnetic interference signals and transmits them to a satellite communication chip, the satellite communication chip encodes and modulates the original electromagnetic interference signals, restores electromagnetic interference signal types and transmits them to the electromagnetic interference database, and compared with the original electromagnetic interference database, the corresponding electromagnetic interference signal types and related information are labeled, the electromagnetic interference types include natural interference, such as lightning, solar radiation, human interference, such as industrial equipment, wireless communication system, equipment self-interference, such as power supply noise, digital circuit noise, and satellite communication specific interference, such as rain attenuation and Doppler shift, and the electromagnetic interference signal related information includes electromagnetic interference signal points, electromagnetic interference signal center frequency, spectral flatness and the like, which are used for low-orbit satellite module electromagnetic interference intelligent diagnosis test.

[0003] In the prior art, during the acquisition of electromagnetic interference signals, first, the satellite affected by electromagnetic interference is determined based on the electromagnetic monitoring results in the satellite system. The electromagnetic monitoring results are obtained by carrying a broadband radio frequency front end on the satellite to scan the electromagnetic environment in real time and detect abnormal frequency bands. The global map coverage matrix is ​​calculated based on the coverage range of the satellite affected by electromagnetic interference, and the global map is expanded into a two-dimensional grid map according to longitude and latitude and preset intervals to generate an initial matrix. By calculating the distance between the satellite and the center of each grid, the corresponding matrix elements that are less than the satellite-to-ground limit distance are assigned a value of 1. Then, the global map coverage matrix is ​​summed, and the area of ​​the satellite affected by electromagnetic interference corresponding to the largest element in the summed matrix is ​​selected as the initial positioning area. Then, a traversal method is used to divide the time window into multiple time points, such as one time point per second. Each time point is traversed and the number of visible satellites at that time point is counted. If the number of visible satellites is greater than or equal to 3, the time point is recorded as meeting the common view condition. If the common view condition is not met, the electromagnetic monitoring results are re-acquired and the above process is repeated. If the common view condition is met, multi-satellite time difference positioning is performed to calculate the coordinates of the electromagnetic interference signal. First, any one of the common view satellites is selected as the primary satellite, and the rest as secondary satellites. The positioning equation is solved by calculating the time difference between the interference signal reaching the primary satellite and each secondary satellite. The time difference calculation process includes: performing discrete Fourier transform on the electromagnetic interference signals received by the primary and secondary satellites and calculating the cross-spectral parameters, and then performing inverse Fourier transform on the cross-spectral parameters to obtain R 12 (τ) function, select the time difference corresponding to its maximum value as the final result, and finally compare the calculated electromagnetic interference signal positioning coordinates with the known positions in the original electromagnetic interference database. If the distance error between the two is within the preset range, the known position is used as the matching result, and the effective electromagnetic interference data is updated to the electromagnetic interference database.

[0004] For example, the Chinese invention patent application with publication number CN110031729B discloses a method, system, and data fusion analysis unit for detecting a partial discharge signal source. The method comprises: acquiring synchronously collected signals from each ultra-high frequency partial discharge sensor deployed at each monitoring point to generate sample signal data; clustering and grouping the sample signal data using a preset clustering algorithm to generate multiple groups of clustered signal data; filtering each group of clustered signal data using a time-domain correlation analysis algorithm to generate candidate partial discharge signal data groups; and performing location analysis on the candidate partial discharge signal data groups to determine the location of the partial discharge source. By implementing the present invention, the coarse positioning of the partial discharge source is achieved, and various types of electromagnetic interference signals can be effectively identified, thereby improving the reliability of partial discharge detection, the sensitivity and efficiency of detecting the partial discharge signal source, and providing an accurate data basis for precisely locating the partial discharge signal source.

[0005] For example, the Chinese invention patent application with publication number CN114814492B discloses a dual-end positioning method for cable partial discharge sources based on the relationship between signal pulse width and propagation distance, comprising: synchronizing acquisition devices on both sides of the cable through satellite timing, and synchronously acquiring partial discharge signals on both sides of the cable through satellite based on the acquisition devices on both sides of the cable; extracting the maximum amplitude pulse signals on both sides of the cable based on the partial discharge signals on both sides of the cable; obtaining the pulse widths of the maximum amplitude pulse signals on both sides of the cable based on the maximum amplitude pulse signals, and comparing the pulse widths of the maximum amplitude pulse signals on both sides of the cable to obtain a pulse width ratio; constructing a database of the functional relationship between the partial discharge signal propagation distance and the partial discharge signal pulse width to obtain the location of the partial discharge source; and performing cluster analysis on multiple positioning data to obtain the final location of the partial discharge source.

[0006] However, in the process of implementing the technical solutions of the invention in the embodiments of the present application, the present application found that the above technology has at least the following technical problems:

[0007] In the existing technology, after adopting the traversal method, since the low-orbit satellite is close to the earth's surface and has a small coverage range, and the orbital speed of the low-orbit satellite is as high as 7.8 kilometers per second, the low-orbit satellite runs at a fast speed, resulting in a short common view time window, causing the center frequency of the electromagnetic interference signal in the radio frequency signal processing to produce Doppler frequency deviation. The Doppler frequency deviation changes in real time with the satellite orbit position. This Doppler frequency deviation will cause the center frequency of the electromagnetic interference signal to drift in a short period of time, resulting in a large dynamic change in the time difference of the electromagnetic interference signal reaching the radio frequency signal processing in the low-orbit satellite module, thereby causing discontinuity in the common view statistics. When there is time point traversal, the low-orbit satellite positioning trajectory is discontinuous, resulting in inaccurate electromagnetic interference positioning of the low-orbit satellite module, causing electromagnetic interference signal recognition errors, resulting in useful electromagnetic interference signals being filtered out or partially lost, causing electromagnetic interference signals and positioning coordinates to be distorted, resulting in a decrease in the matching degree of static positioning recognition in the electromagnetic interference database, resulting in inaccurate electromagnetic interference classification, and then there is a problem of low accuracy of the electromagnetic interference intelligent diagnosis test of the low-orbit satellite module due to Doppler frequency deviation. Summary of the Invention

[0008] The embodiments of the present application provide a method and system for intelligent diagnosis and testing of electromagnetic interference of low-orbit satellite modules, thereby solving the problem in the prior art of low accuracy of intelligent diagnosis and testing of electromagnetic interference of low-orbit satellite modules due to Doppler frequency deviation, and achieving an improvement in the accuracy of the intelligent diagnosis and testing method for electromagnetic interference of low-orbit satellite modules.

[0009] On the one hand, an embodiment of the present application provides a low-orbit satellite module electromagnetic interference intelligent diagnosis and testing method, comprising the following steps:

[0010] During the electromagnetic interference collection process of the low-orbit satellite module, the electromagnetic interference signal frequency deviation evaluation is performed to determine whether the electromagnetic interference frequency deviation optimization is performed. The electromagnetic interference frequency deviation optimization means adjusting the frequency band of the electromagnetic interference signal and the electromagnetic interference signal frequency collection range by performing sequence spread spectrum optimization and orthogonal multiplexing optimization. The sequence spread spectrum optimization means ensuring the spread spectrum code synchronization of the electromagnetic interference signal by performing sequence spread spectrum processing and adjusting the spread spectrum code frequency. The orthogonal multiplexing optimization means reducing the electromagnetic interference signal collection range by performing orthogonal multiplexing processing and reducing the electromagnetic interference signal frequency collection radius operation; the electromagnetic interference signal reception evaluation is performed to determine whether the electromagnetic interference signal reception qualification conditions are met based on the electromagnetic interference signal time difference deviation result. The qualified conditions for receiving the magnetic interference signal determine whether to perform the electromagnetic interference signal positioning accuracy evaluation. If the obtained electromagnetic interference signal time difference deviation result meets the qualified conditions for receiving the electromagnetic interference signal, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database. Otherwise, the electromagnetic interference signal positioning accuracy evaluation is performed. If the electromagnetic interference signal positioning accuracy evaluation is performed, it is determined whether to perform electromagnetic interference signal positioning optimization based on the electromagnetic interference signal positioning impact result. If the electromagnetic interference signal positioning optimization is not performed, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database. Performing electromagnetic interference signal positioning optimization means dividing the receiving time points and performing adaptive filtering processing to cover the electromagnetic interference signal range.

[0011] On the other hand, a low-orbit satellite module electromagnetic interference intelligent diagnosis and testing system is provided, which applies, for example, a low-orbit satellite module electromagnetic interference intelligent diagnosis and testing method. The system includes: an electromagnetic interference signal frequency deviation evaluation module, an electromagnetic interference signal reception evaluation module, and an electromagnetic interference signal positioning accuracy evaluation module: the electromagnetic interference signal frequency deviation evaluation module is used to perform electromagnetic interference signal frequency deviation evaluation to determine whether to perform electromagnetic interference frequency deviation optimization during the electromagnetic interference acquisition process of the low-orbit satellite module; the electromagnetic interference signal reception evaluation module is used to perform electromagnetic interference signal reception evaluation, determine whether the electromagnetic interference signal reception qualification condition is met based on the electromagnetic interference signal time difference deviation result, and determine whether to perform electromagnetic interference signal positioning accuracy evaluation based on the electromagnetic interference signal reception qualification condition; if the obtained electromagnetic interference signal time difference deviation result meets the electromagnetic interference signal reception qualification condition, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database; otherwise, the electromagnetic interference signal positioning accuracy evaluation is performed; the electromagnetic interference signal positioning accuracy evaluation module is used to determine whether to perform electromagnetic interference signal positioning optimization based on the electromagnetic interference signal positioning impact result when performing the electromagnetic interference signal positioning accuracy evaluation; if the electromagnetic interference signal positioning optimization is not performed, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database.

[0012] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0013] 1. First, perform an electromagnetic interference signal frequency deviation assessment to obtain electromagnetic interference signal frequency deviation change results. Based on the electromagnetic interference signal frequency deviation change results, determine whether the electromagnetic interference signal frequency deviation change conditions are met to determine whether to perform electromagnetic interference signal frequency deviation optimization. This helps to accurately assess the electromagnetic interference signal type of the low-orbit satellite module and avoid confusing the electromagnetic interference signal with normal communication signals or natural noise, thereby improving the accuracy of electromagnetic interference signal positioning. Second, perform an electromagnetic interference signal reception assessment to obtain electromagnetic interference signal time difference deviation results. Based on the electromagnetic interference signal time difference deviation results, determine whether the electromagnetic interference signal reception conditions are met to determine whether to perform electromagnetic interference signal positioning accuracy assessment, which helps to improve the accuracy of electromagnetic interference signal identification. Finally, perform an electromagnetic interference signal positioning accuracy assessment to obtain electromagnetic interference signal positioning impact results. Based on the electromagnetic interference signal positioning impact results, determine whether the electromagnetic interference signal positioning conditions are met to determine whether to perform electromagnetic interference signal positioning optimization. This helps to accurately assess the impact of multi-dimensional errors on the identification and positioning of electromagnetic interference signals, further narrow the location range of the electromagnetic interference signal source, avoid misjudgment caused by electromagnetic interference signal reflection or multipath effects, and thus enhance the adaptive anti-interference capability of the low-orbit satellite module in identifying and locating electromagnetic interference signals.

[0014] 2. By obtaining the results of electromagnetic interference frequency deviation changes to judge the quality and deviation of electromagnetic interference signal identification, it is helpful to evaluate the stability of the low-orbit satellite module in identifying electromagnetic interference signals, determine whether the characteristics of the identified electromagnetic interference signals are consistent, and further improve the low-orbit satellite module's ability to resist frequency deviation in identifying electromagnetic interference signals, thereby improving the recognition confidence of electromagnetic interference signals and ensuring the efficiency of the low-orbit satellite module in identifying electromagnetic interference signals.

[0015] 3. The electromagnetic interference signal positioning indicators are multi-dimensionally coupled to obtain the electromagnetic interference signal positioning impact results. Compared with the existing technology, which adopts the traversal method and causes the low-orbit satellite positioning trajectory to be discontinuous due to the fast operation speed of the low-orbit satellite, it helps to quantitatively evaluate the accuracy of receiving and identifying electromagnetic interference signals, reflect the source of the influence of electromagnetic interference signal identification and positioning, and suppress the influence of noise and error on electromagnetic interference signal positioning, thereby improving the positioning efficiency of the low-orbit satellite module, and then improving the positioning accuracy and anti-interference capability of the low-orbit satellite module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flowchart of a method for intelligent diagnosis and testing of electromagnetic interference in a low-orbit satellite module provided in an embodiment of the present application;

[0017] Figure 2A schematic diagram of the architecture of an intelligent diagnostic test method for electromagnetic interference of a low-orbit satellite module provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of an electromagnetic interference frequency deviation optimization framework for an intelligent diagnostic test method for electromagnetic interference of a low-orbit satellite module provided in an embodiment of the present application;

[0019] Figure 4 This is a structural diagram of a low-orbit satellite module electromagnetic interference intelligent diagnosis and testing system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The present invention provides a method and system for intelligent diagnosis and testing of electromagnetic interference in low-orbit satellite modules, which solves the problem of low accuracy of intelligent diagnosis and testing of electromagnetic interference in low-orbit satellite modules due to Doppler frequency offset.

[0021] The technical solution in the embodiment of the present application is to solve the problem of low accuracy of electromagnetic interference intelligent diagnosis test of low-orbit satellite modules due to Doppler frequency offset. The overall idea is as follows:

[0022] During the electromagnetic interference collection process of the low-orbit satellite module, the electromagnetic interference signal frequency deviation evaluation is performed to determine whether to perform electromagnetic interference frequency deviation optimization; the electromagnetic interference signal reception evaluation is performed to determine whether to perform electromagnetic interference signal positioning accuracy evaluation; the electromagnetic interference signal positioning accuracy evaluation is performed to determine whether to perform electromagnetic interference signal positioning optimization, thereby achieving the effect of improving the accuracy of the electromagnetic interference intelligent diagnosis test of the low-orbit satellite module.

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] As an implementation method of the first aspect, Figure 1 FIG. 1 is a flow chart of a method for intelligent diagnosis and testing of electromagnetic interference of a low-orbit satellite module provided in an embodiment of the present application. The processing flow of the method may include the following steps:

[0025] First, electromagnetic interference signal frequency deviation evaluation: Perform electromagnetic interference signal frequency deviation evaluation to obtain the electromagnetic interference frequency deviation change result. According to the electromagnetic interference frequency deviation change result, determine whether the electromagnetic interference frequency deviation change qualification conditions are met to determine whether to perform electromagnetic interference frequency deviation optimization. The electromagnetic interference signal frequency deviation evaluation helps to improve the accuracy of electromagnetic interference signal positioning.

[0026] Secondly, electromagnetic interference signal reception evaluation: perform electromagnetic interference signal reception evaluation to obtain the electromagnetic interference signal time difference deviation result, and judge whether the electromagnetic interference signal reception qualification conditions are met according to the electromagnetic interference signal time difference deviation result to determine whether to perform electromagnetic interference signal positioning accuracy evaluation. The electromagnetic interference signal reception evaluation helps to improve the accuracy of electromagnetic interference signal identification.

[0027] Finally, electromagnetic interference signal positioning accuracy evaluation: Perform electromagnetic interference signal positioning accuracy evaluation to obtain the electromagnetic interference signal positioning impact results, and judge whether the electromagnetic interference signal positioning qualification conditions are met based on the electromagnetic interference signal positioning impact results to determine whether to perform electromagnetic interference signal positioning optimization. The electromagnetic interference signal positioning accuracy evaluation helps to enhance the adaptive anti-interference capability of low-orbit satellite modules in identifying and locating electromagnetic interference signals.

[0028] It should be added that in this application, before designing a low-orbit satellite module electromagnetic interference intelligent diagnosis and testing method, a database for storing various setting data is established. The database includes but is not limited to the preset electromagnetic interference signal center frequency offset, the preset electromagnetic interference frequency deviation change result, the preset electromagnetic interference signal arrival time difference and the preset electromagnetic interference signal positioning impact result, etc., and the various numerical values ​​are directly set by technical personnel.

[0029] like Figure 2As shown, the architecture schematic diagram of the low-orbit satellite module electromagnetic interference intelligent diagnosis test method provided by the embodiment of the application includes the following steps: first, performing electromagnetic interference signal frequency offset evaluation, obtaining electromagnetic interference frequency offset change results and judging whether the electromagnetic interference frequency offset change results meet the electromagnetic interference frequency offset change qualified condition, if the electromagnetic interference frequency offset change results meet the electromagnetic interference frequency offset change qualified condition, performing electromagnetic interference signal receiving evaluation, otherwise, sending an electromagnetic interference signal frequency offset abnormality prompt, performing electromagnetic interference frequency offset optimization, re-obtaining electromagnetic interference frequency offset change results and judging whether the electromagnetic interference frequency offset change results meet the electromagnetic interference frequency offset change qualified condition, if the electromagnetic interference frequency offset change results re-obtained after the electromagnetic interference frequency offset optimization meet the electromagnetic interference frequency offset change qualified condition, performing electromagnetic interference signal receiving evaluation, otherwise, sending an electromagnetic interference frequency offset optimization abnormality prompt to a preset person; then, performing electromagnetic interference signal receiving evaluation, obtaining electromagnetic interference signal time difference deviation results and judging whether the electromagnetic interference signal time difference deviation results meet the electromagnetic interference signal receiving qualified condition, if the electromagnetic interference signal time difference deviation results meet the electromagnetic interference signal receiving qualified condition, storing the corresponding electromagnetic interference signal and positioning coordinates into an electromagnetic interference database, otherwise, performing electromagnetic interference signal positioning accuracy evaluation; finally, obtaining electromagnetic interference signal positioning influence results and judging whether the electromagnetic interference signal positioning influence results meet the electromagnetic interference signal positioning qualified condition; if the electromagnetic interference signal positioning influence results meet the electromagnetic interference signal positioning qualified condition, storing the corresponding electromagnetic interference signal and positioning coordinates into the electromagnetic interference database, otherwise, performing electromagnetic interference signal positioning optimization, re-obtaining electromagnetic interference signal positioning influence results and judging whether the electromagnetic interference signal positioning influence results meet the electromagnetic interference signal positioning qualified condition, if the electromagnetic interference signal positioning influence results meet the electromagnetic interference signal positioning qualified condition, storing the corresponding electromagnetic interference signal and positioning coordinates into the electromagnetic interference database, otherwise, sending an electromagnetic interference signal positioning optimization abnormality prompt to the preset person.

[0030] In the embodiment, the low-orbit satellite module electromagnetic interference intelligent diagnosis test method includes receiving electromagnetic interference signals through a phased array antenna and inputting the received electromagnetic interference signals into an electromagnetic interference database, and the electromagnetic interference signal frequency offset evaluation, the electromagnetic interference signal receiving evaluation and the electromagnetic interference signal positioning accuracy evaluation are associated with each other and step by step, and the electromagnetic interference signal frequency offset evaluation, the electromagnetic interference signal receiving evaluation and the electromagnetic interference signal positioning accuracy evaluation interact with each other and are connected, thereby improving the accuracy and stability of the low-orbit satellite module in identifying and positioning electromagnetic interference signals, and through the layer-by-layer evaluation and step-by-step optimization of the electromagnetic interference signal frequency offset evaluation, the electromagnetic interference signal receiving evaluation and the electromagnetic interference signal positioning accuracy evaluation, the effect of improving the accuracy of the low-orbit satellite module electromagnetic interference intelligent diagnosis test is realized.

[0031] Further, the specific process of performing the electromagnetic interference signal frequency deviation evaluation to determine whether to perform electromagnetic interference frequency deviation optimization is as follows: obtaining an electromagnetic interference frequency deviation change result; determining whether the obtained electromagnetic interference frequency deviation change result meets an electromagnetic interference frequency deviation change qualified condition; if the electromagnetic interference frequency deviation change result meets the electromagnetic interference frequency deviation change qualified condition, performing electromagnetic interference signal reception evaluation, otherwise, sending an electromagnetic interference signal frequency deviation abnormality prompt, performing electromagnetic interference frequency deviation optimization, including performing resampling operation, performing sequence spread spectrum optimization, and performing orthogonal multiplexing optimization; the electromagnetic interference frequency deviation change result is represented by the difference between the electromagnetic interference signal center frequency offset and the preset electromagnetic interference signal center frequency offset, wherein, due to the high-speed operation of the low-orbit satellite module, the Doppler effect in the electromagnetic interference signal propagation path, device frequency drift and other factors, the electromagnetic interference signal center frequency offset is usually within ±10 kHz to ±1 MHz, for the high-speed motion of the low-orbit satellite, about 7.8 km / s, the electromagnetic interference signal center frequency offset caused by the Doppler effect can reach ±10 kHz to ±100 kHz, if the electromagnetic interference source is a ground or air moving target such as an airplane or a ship, the electromagnetic interference signal center frequency offset can be larger, even up to ±1 MHz; the electromagnetic interference frequency deviation change qualified condition represents that the electromagnetic interference frequency deviation change result is less than a preset electromagnetic interference frequency deviation change result, wherein, the electromagnetic interference signal center frequency offset of each antenna receiving end in a preset collection time period is monitored by a spectrum analyzer, the preset collection time period represents a preset time period corresponding to the execution of the electromagnetic interference signal frequency deviation evaluation by the preset personnel, the preset electromagnetic interference signal center frequency offset is represented by the average value of the electromagnetic interference signal center frequency offset in the historical time period, and the preset electromagnetic interference frequency deviation change result is represented by the average value of the electromagnetic interference frequency deviation change result in the historical time period; the resampling operation represents that the low-orbit satellite module re-collects the electromagnetic interference signal; the electromagnetic interference frequency deviation change result is used to accurately evaluate the frequency deviation of the electromagnetic interference signal, thereby enhancing the positioning accuracy of the electromagnetic interference signal and improving the reliability of the electromagnetic interference signal identification.

[0032] In the embodiment, by performing the electromagnetic interference signal frequency deviation evaluation, different types of electromagnetic interference signals can be accurately distinguished, the accuracy of the low-orbit satellite module in receiving and identifying the electromagnetic interference signal is improved, the suppression ability of the low-orbit satellite module to the frequency deviation of the electromagnetic interference signal is improved, the spatial resolution of the electromagnetic interference signal is improved, the characteristic information of the electromagnetic interference signal is clear, and the reliability of the electromagnetic interference signal identification evaluation result is further enhanced, thereby providing a strong guarantee for the stable operation of the low-orbit satellite module and the collection and identification of the electromagnetic interference signal.

[0033] As Figure 3As shown, a schematic diagram of an electromagnetic interference frequency deviation optimization framework of an electromagnetic interference intelligent diagnosis test method for a low-orbit satellite module provided in an embodiment of the present application is provided. An electromagnetic interference signal frequency deviation evaluation is performed, and an electromagnetic interference frequency deviation change result is obtained and it is judged whether it meets the electromagnetic interference frequency deviation change qualification condition. If the electromagnetic interference frequency deviation change result meets the electromagnetic interference frequency deviation change qualification condition, an electromagnetic interference signal reception evaluation is performed. Otherwise, an electromagnetic interference signal frequency deviation abnormality prompt is sent, and electromagnetic interference frequency deviation optimization is performed. The electromagnetic interference frequency deviation optimization includes sequence spread spectrum optimization and orthogonal multiplexing optimization. Among them, sequence spread spectrum optimization means performing sequence spread spectrum processing and spread spectrum code frequency adjustment at the same time, and judging the electromagnetic interference regained after sequence spread spectrum optimization. Whether the frequency offset change result meets the electromagnetic interference frequency offset change qualification conditions; if the electromagnetic interference frequency offset change result obtained after sequence spread spectrum optimization meets the electromagnetic interference frequency offset change qualification conditions, then perform electromagnetic interference signal reception evaluation; otherwise, perform orthogonal multiplexing optimization; performing orthogonal multiplexing optimization means performing orthogonal multiplexing processing and reducing the electromagnetic interference signal frequency acquisition radius operation at the same time; determine whether the electromagnetic interference frequency offset change result obtained after orthogonal multiplexing optimization meets the electromagnetic interference frequency offset change qualification conditions; if the electromagnetic interference frequency offset change result obtained after orthogonal multiplexing optimization meets the electromagnetic interference frequency offset change qualification conditions, perform electromagnetic interference signal reception evaluation; otherwise, send an electromagnetic interference frequency offset optimization exception to the preset personnel.

[0034] Furthermore, the specific process of sequence spread spectrum optimization is as follows: sequence spread spectrum optimization means performing sequence spread spectrum processing and spread spectrum code frequency adjustment at the same time, sequence spread spectrum processing provides the basic anti-multipath capability of the phased array antenna, and spread spectrum code frequency adjustment further enhances the system's adaptability to complex interference environments through parameter optimization and dynamic response. The synergistic effect of the two not only improves the anti-interference capability of the electromagnetic interference signal, but also improves the efficiency of electromagnetic interference signal identification and positioning of the low-orbit satellite module in an environment that can operate at high speed; sequence spread spectrum processing means mapping the original electromagnetic interference signal to the satellite electromagnetic interference signal frequency band by setting the spread spectrum code, and setting the same spread spectrum code based on the radio frequency signal processing for despreading, thereby restoring the original electromagnetic interference signal; satellite electromagnetic interference signal frequency band means that the satellite electromagnetic interference signal frequency band is greater than the frequency band corresponding to the original satellite electromagnetic interference signal frequency band; sequence spread spectrum processing is used to disperse the energy of the original electromagnetic interference signal to a wider frequency band, so that the electromagnetic interference signal power within the unit frequency band is reduced, The impact of the electromagnetic interference signal frequency change caused by Doppler frequency shift is dispersed throughout the entire spread spectrum bandwidth rather than concentrated within the narrowband range of the original signal, thereby reducing the impact of the electromagnetic interference signal frequency deviation on the overall acquisition of the electromagnetic interference signal. Spread spectrum code frequency adjustment means gradually increasing the spread spectrum code frequency based on the original spread spectrum code frequency with an amplitude corresponding to a preset spread spectrum code frequency ratio as an adjustment step. When the spread spectrum code frequency reaches a preset maximum spread spectrum code frequency, the electromagnetic interference frequency deviation change result still does not meet the electromagnetic interference frequency deviation change qualification condition, and orthogonal multiplexing optimization is performed. The spread spectrum code frequency is less than the preset maximum spread spectrum code frequency. The spread spectrum code frequency of each antenna receiving end is preset during a preset acquisition optimization time period monitored by a spread spectrum signal analyzer. The preset acquisition optimization time period refers to a preset time period corresponding to electromagnetic interference frequency deviation optimization set by a preset person. The preset maximum spread spectrum code frequency is set by a preset person. The operating frequency band of a low-orbit satellite module generally includes multiple frequency points, such as the L band from 1.2 GHz to 1.5 GHz and the S band from 2.2 GHz to 2.5GHz, etc. The spreading code frequency parameter range in sequence spreading is typically between 1Mbps and 1Gbps. The preset spreading code frequency ratio is obtained by inputting the electromagnetic interference frequency offset change result and the electromagnetic interference signal frequency into a database. The database contains a spreading code frequency correction set that reflects the correction relationship between the electromagnetic interference frequency offset change result, the electromagnetic interference signal frequency, and the corresponding preset spreading code frequency ratio. Spreading code frequency adjustment is used to reduce the electromagnetic interference signal peak during despreading, avoid degradation of electromagnetic interference signal recovery quality, ensure synchronization of the spreading code frequency of the electromagnetic interference signal, accurately compensate for the frequency offset of the electromagnetic interference signal, effectively address the problem of spreading code frequency desynchronization caused by frequency offset, and improve the frequency offset resistance of the sequence spreading process. If the electromagnetic interference frequency offset change result re-obtained after sequence spreading optimization meets the electromagnetic interference frequency offset change qualification condition, electromagnetic interference signal reception evaluation is performed; otherwise, orthogonal multiplexing optimization is performed.

[0035] In this embodiment, by performing sequence spread spectrum optimization, the satellite module can accurately match the received electromagnetic interference signal with the known electromagnetic interference signal characteristics, thereby effectively distinguishing the electromagnetic interference signal from noise and other communication signals, thereby improving the low-orbit satellite module's electromagnetic interference signal recognition capability in the high-speed operation environment of high-orbit and low-orbit satellite modules, enhancing the low-orbit satellite module's anti-interference capability, and further ensuring the stability and reliability of the low-orbit satellite module's communication link.

[0036] It should be added that sequence spread spectrum optimization helps to enhance the anti-multipath and anti-interference capabilities of the phased array antenna, and at the same time provides a basis for suppressing the Doppler frequency deviation of the received electromagnetic interference signal, realizes the separation of electromagnetic interference signals in the spatial dimension of the phased array antenna, suppresses the interference of noise on the reception of electromagnetic interference signals, reduces the phase change characteristics caused by Doppler frequency shift, thereby accurately suppressing Doppler offset, and further improves the robustness of the electromagnetic interference signal, and ultimately achieves the effect of improving the accuracy of electromagnetic interference signal detection and processing.

[0037] Furthermore, orthogonal multiplexing optimization includes simultaneously performing orthogonal multiplexing processing and performing an operation to reduce the frequency acquisition radius of the electromagnetic interference signal. The orthogonal multiplexing processing and the operation to reduce the frequency acquisition radius of the electromagnetic interference signal have a synergistic effect in the electromagnetic interference signal identification, which helps to improve the anti-interference capability of the low-orbit satellite module, and can not only maintain the quality of the electromagnetic interference signal within a wide frequency range, but also improve the efficiency of electromagnetic interference signal identification; performing orthogonal multiplexing processing means projecting the electromagnetic interference signal received after sequence spread spectrum optimization into a preset angular domain space, wherein the preset angular domain space represents the angular coverage range of the electromagnetic interference signal received by the phased array antenna, which is usually described by the azimuth and pitch angles with the low-orbit satellite module as the center. The direction of the electromagnetic interference signal source, the azimuth angle range is 0° to 360°, the pitch angle range is -90° to +90°, negative values ​​indicate downward, and positive values ​​indicate upward. Due to the obstruction of the earth and the limitation of the antenna beam, the pitch angle of the low-orbit satellite module is -5° to +85°. The received electromagnetic interference signal is conjugate multiplied to obtain the electromagnetic interference signal of each preset angular domain space, and then the electromagnetic interference signal of each preset angular domain space is multiplied with the local synchronization sequence to obtain a high-precision timing synchronization position; the operation of reducing the electromagnetic interference signal frequency acquisition radius means that the amplitude corresponding to the preset electromagnetic interference signal frequency acquisition radius ratio is used as the adjustment step to gradually reduce the electromagnetic interference signal frequency acquisition radius on the basis of the original electromagnetic interference signal frequency acquisition radius. When the monitored electromagnetic interference frequency deviation change result meets the electromagnetic interference frequency deviation change qualification condition, the orthogonal multiplexing optimization is stopped; the electromagnetic interference signal frequency acquisition radius is smaller than the preset maximum electromagnetic interference signal frequency acquisition radius, and the electromagnetic interference signal frequency acquisition radius of each antenna receiving end is preset during the preset acquisition optimization time period monitored by a spectrum analyzer, and the preset maximum electromagnetic interference signal frequency acquisition radius is set by a preset personnel; the preset electromagnetic interference signal frequency acquisition radius ratio is obtained by inputting the electromagnetic interference frequency deviation change result and the electromagnetic interference signal frequency acquisition range into the database, wherein the database contains an acquisition radius correction set, which is used to reflect the difference between the electromagnetic interference frequency deviation change result and the electromagnetic interference signal frequency acquisition range and the acquisition radius. The correction relationship between the corresponding preset electromagnetic interference signal frequency acquisition radius ratios; if the electromagnetic interference frequency deviation change result re-acquired after orthogonal multiplexing optimization meets the electromagnetic interference frequency deviation change qualification conditions, the electromagnetic interference signal reception evaluation is performed, otherwise the electromagnetic interference frequency deviation optimization exception is sent to the preset personnel; orthogonal multiplexing processing is used to reduce the electromagnetic interference signal frequency deviation to improve the low-orbit satellite module's anti-frequency deviation capability in high-speed mobile scenarios, thereby providing reliable protection for the transmission of electromagnetic interference signals; the operation of reducing the electromagnetic interference signal frequency acquisition radius is used to reduce the difficulty of collecting electromagnetic interference signals of low-orbit satellite modules under high-speed movement, speed up the acquisition speed of electromagnetic interference signals, and thus reduce the electromagnetic interference frequency deviation.

[0038] In this embodiment, by performing orthogonal multiplexing optimization, the low-orbit satellite module can accurately identify the spatial orientation of the electromagnetic interference signal, thereby effectively distinguishing electromagnetic interference signals in different directions, and obtaining the true characteristic information of the electromagnetic interference signal. The true characteristic information includes: the center frequency of the electromagnetic interference signal, the amplitude of the electromagnetic interference signal, etc., which helps to improve the frequency resolution of the electromagnetic interference signal, thereby enhancing the accuracy of the low-orbit satellite module in obtaining the interference signal characteristic information, and further enhancing the response capability of the low-orbit satellite module to identify electromagnetic interference signals.

[0039] Furthermore, the specific process of determining whether to perform electromagnetic interference signal positioning accuracy evaluation based on the electromagnetic interference signal reception qualification condition is as follows: obtaining the electromagnetic interference signal time difference deviation result and determining whether it meets the electromagnetic interference signal reception qualification condition; if the obtained electromagnetic interference signal time difference deviation result meets the electromagnetic interference signal reception qualification condition, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database for use in the low-orbit satellite module electromagnetic interference intelligent diagnosis test; otherwise, the electromagnetic interference signal positioning accuracy evaluation is performed; the electromagnetic interference signal time difference deviation result is quantitatively represented by the average value of the time difference of the same electromagnetic interference signal reaching different receiving antennas and the ratio of the preset electromagnetic interference signal arrival time difference, wherein the electromagnetic interference signal arrival time difference of each antenna of the receiving end is preset in the evaluation time period through the multi-channel data acquisition card, and the preset electromagnetic interference signal arrival time difference is represented by the electromagnetic interference signal arrival time difference in the historical time period. Generally, the time difference of the same electromagnetic interference signal reaching different receiving antennas of the low-orbit satellite module is between 0.1 nanoseconds and 10 nanoseconds. If a multipath effect occurs, the time difference of the same electromagnetic interference signal reaching different receiving antennas of the low-orbit satellite module is between 10 nanoseconds and 100 nanoseconds. Nanoseconds, or even more than 100 nanoseconds; the electromagnetic interference signal time difference deviation result is used to quantitatively evaluate the electromagnetic interference signal reception time, thereby determining the electromagnetic interference signal transmission direction, especially in the scenario of high-speed movement of low-orbit satellite modules. Real-time monitoring of the time difference can track the position changes of the electromagnetic interference signal in real time, further improving the positioning accuracy and reliability of the electromagnetic interference signal; the qualified condition for electromagnetic interference signal reception indicates that the electromagnetic interference signal time difference deviation result is within the electromagnetic interference signal time difference deviation result range; the electromagnetic interference signal time difference deviation result range indicates the range between the maximum electromagnetic interference signal time difference deviation result and the minimum electromagnetic interference signal time difference deviation result obtained in the historical time period.

[0040] In this embodiment, by performing electromagnetic interference signal reception evaluation, inaccurate collected electromagnetic interference signals due to poor electromagnetic interference signal quality can be avoided, and the accuracy of electromagnetic interference signal identification can be ensured, thereby reducing the continuous changes in the transmission direction and time difference of the electromagnetic interference signal caused by the high-speed movement of the low-orbit satellite, improving the anti-interference ability of the phased array antenna for electromagnetic interference signal identification, and thereby improving the overall performance of the low-orbit satellite module for electromagnetic interference signal identification and positioning.

[0041] Furthermore, the specific process of performing electromagnetic interference signal positioning accuracy evaluation to determine whether to perform electromagnetic interference signal positioning optimization is as follows: obtaining the electromagnetic interference signal positioning impact result and determining whether it meets the electromagnetic interference signal positioning qualification conditions; if the electromagnetic interference signal positioning impact result meets the electromagnetic interference signal positioning qualification conditions, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database, otherwise, electromagnetic interference signal positioning optimization is performed; the electromagnetic interference signal positioning impact result is used to quantify the comprehensive impact of error sources in multiple dimensions on the positioning results, thereby real-time monitoring of the stability of the low-orbit satellite module in receiving electromagnetic interference signals in complex environments.

[0042] In this embodiment, the electromagnetic interference signal positioning accuracy assessment can improve the efficiency of electromagnetic interference signal identification and positioning by real-time monitoring of the stability of the phased array antenna in receiving electromagnetic interference signals, ensuring that it stably and reliably receives electromagnetic interference signals under high-speed operation of the low-orbit satellite module, which helps to accurately assess the source and size of the electromagnetic interference positioning error, and enhance the anti-interference capability of the phased array antenna of the low-orbit satellite module, thereby achieving the effect of improving the reliability and accuracy of electromagnetic interference signal positioning and identification.

[0043] Furthermore, the specific process of obtaining the electromagnetic interference signal positioning impact result is as follows:

[0044] First, the electromagnetic interference signal positioning deviation value is combined with the corresponding signal positioning control rate to perform weighted calculation to obtain the electromagnetic interference signal positioning index.

[0045] It should be noted that the corresponding signal positioning control rate is obtained by inputting the real-time monitored electromagnetic interference signal positioning deviation value into the electromagnetic interference signal positioning mapping set. The electromagnetic interference signal positioning mapping set is a result obtained by mapping the electromagnetic interference signal positioning deviation value to the corresponding signal positioning control rate using a preset mapping relationship. In this embodiment, the signal positioning control rate ranges from 0 to 1. The signal positioning control rate includes: time difference control rate, angle control rate, and amplitude control rate, which are used to reflect the degree to which the electromagnetic interference signal positioning deviation value affects the electromagnetic interference signal positioning result.

[0046] Specifically, the expression of the electromagnetic interference signal arrival time difference index is: , a=1,2,...,s, a represents the number of the preset receiving time period, s represents the total number of preset receiving time periods, X(a) represents the arrival time difference index of the electromagnetic interference signal in the a-th preset receiving time period, ΔX1(a) represents the time difference deviation result of the electromagnetic interference signal in the a-th preset receiving time period, μ1 represents the time difference control rate, the preset receiving time period represents the preset time period corresponding to the electromagnetic interference signal positioning accuracy evaluation set by the preset personnel, the electromagnetic interference signal time difference deviation result represents the electromagnetic interference signal time difference deviation result corresponding to the electromagnetic interference frequency deviation change qualification condition, the larger the electromagnetic interference signal time difference deviation result, the stronger the influence of the electromagnetic interference signal time difference deviation result on the electromagnetic interference signal positioning, the larger the electromagnetic interference signal time difference deviation result, the greater the electromagnetic interference signal time difference deviation result, the greater the electromagnetic interference signal reflection, scattering, etc., which will cause the time difference deviation of the electromagnetic interference signals of multiple paths to increase, generating multipath electromagnetic interference signals, thereby reducing the accuracy of electromagnetic interference signal reception.

[0047] Specifically, the expression of the electromagnetic interference signal arrival angle index is: , Y(a) represents the electromagnetic interference signal arrival angle index of the a-th preset receiving time period, ΔY1(a) represents the electromagnetic interference signal arrival angle deviation result of the a-th preset receiving time period, and μ2 represents the angle control rate. The phased array antenna monitors the electromagnetic interference signal arrival angle at each antenna receiving end in the preset receiving time period, and the average value is used as the electromagnetic interference signal arrival angle. The larger the electromagnetic interference signal arrival angle index, the stronger the influence of the electromagnetic interference signal arrival angle index on the electromagnetic interference signal positioning. The larger the electromagnetic interference signal arrival angle index, the more complex the electromagnetic interference signal propagation path in space, resulting in the dispersion of the electromagnetic interference signal arrival angle at the phased array antenna, thereby reducing the electromagnetic interference signal reception sensitivity. When the phased array antenna spacing of the low-orbit satellite module is 1 meter, the signal frequency is 2 GHz, and the wavelength is 40 cm, the electromagnetic interference signal arrival angle may be between 0.1° and 1°. During the high-speed movement of the low-orbit satellite module, due to the change of the signal propagation path, the angle deviation may change dynamically, but it still fluctuates between 0.1° and 5°.

[0048] Specifically, the expression of the electromagnetic interference signal arrival amplitude index is: , Z(a) represents the electromagnetic interference signal arrival amplitude index of the a-th preset receiving time period, ΔZ1(a) represents the electromagnetic interference signal amplitude deviation result of the a-th preset receiving time period, μ3 represents the amplitude control rate, and the electromagnetic interference signal arrival amplitude of each antenna receiving end is preset in the preset receiving time period by monitoring the phased array antenna, and its average value is used as the electromagnetic interference signal arrival amplitude. The larger the electromagnetic interference signal arrival amplitude index, the stronger the influence of the electromagnetic interference signal arrival amplitude index on the electromagnetic interference signal positioning. The larger the electromagnetic interference signal arrival amplitude index, the more it means that multipath electromagnetic interference signals are superimposed, resulting in unstable amplitude distribution of electromagnetic interference signals, thereby reducing the accuracy of electromagnetic interference signal positioning. The electromagnetic interference signal arrival amplitude decays with distance and follows the inverse square law. ,r is the propagation distance of the electromagnetic interference signal, and V represents the amplitude of the electromagnetic interference signal reaching the phased array antenna of the low-orbit satellite module.

[0049] Next, the electromagnetic interference signal positioning indicators are multi-dimensionally coupled to obtain the electromagnetic interference signal positioning impact result, which is used to reflect the comprehensive effect of the electromagnetic interference signal positioning deviation value on the accuracy of the electromagnetic interference signal positioning impact result.

[0050] Among them, the electromagnetic interference signal positioning impact result is obtained by the following method:

[0051] ;

[0052] Where F(a) represents the electromagnetic interference signal positioning impact result of the a-th preset receiving time period.

[0053] It should be noted that the electromagnetic interference signal positioning index includes: electromagnetic interference signal time difference of arrival index, electromagnetic interference signal angle of arrival index and electromagnetic interference signal amplitude of arrival index; the electromagnetic interference signal positioning deviation value is obtained by proportionally quantifying the electromagnetic interference signal positioning influence result and the preset electromagnetic interference signal positioning influence result, including: electromagnetic interference signal time difference deviation result, electromagnetic interference signal angle of arrival deviation result and electromagnetic interference signal amplitude deviation result; the electromagnetic interference signal positioning influence result includes: electromagnetic interference signal time difference of arrival, electromagnetic interference signal angle of arrival and electromagnetic interference signal amplitude of arrival; the preset electromagnetic interference signal positioning influence result includes: preset electromagnetic interference signal time difference of arrival, preset electromagnetic interference signal angle of arrival and preset electromagnetic interference signal amplitude of arrival, the preset electromagnetic interference signal positioning influence result is represented by the average value of the electromagnetic interference signal positioning influence result in the historical time period, the preset electromagnetic interference signal angle of arrival is represented by the average value of the electromagnetic interference signal angle of arrival in the historical time period, and the preset electromagnetic interference signal amplitude of arrival is represented by the average value of the electromagnetic interference signal amplitude of arrival in the historical time period, the electromagnetic interference signal time difference of arrival and the preset electromagnetic interference signal time difference of arrival are both in seconds, the electromagnetic interference signal angle of arrival and the preset electromagnetic interference signal angle of arrival are both in degrees, and the electromagnetic interference signal amplitude of arrival and the preset electromagnetic interference signal amplitude of arrival are both in decibel milliwatts.

[0054] In the embodiment, the influence degree analysis of the electromagnetic interference signal positioning based on the electromagnetic interference signal positioning index obtains the electromagnetic interference signal positioning influence result. Since the electromagnetic interference signal reaches each antenna receiving end through different paths, the signal of the reflection path may increase the electromagnetic signal time difference due to the path length difference, and the angle of arrival deviates from the angle of the direct path, causing angle deviation, so the electromagnetic interference signal angle of arrival deviation result increases. Since the multi-path signals are superimposed at the receiving end, the amplitude may be enhanced or attenuated due to in-phase or anti-phase superposition, resulting in an increase in the electromagnetic interference signal amplitude deviation result, thereby causing a synchronous change in the electromagnetic interference signal angle of arrival deviation, and further causing an increase in the electromagnetic interference signal angle of arrival deviation result, thereby achieving the effect of improving the low-orbit satellite module electromagnetic interference intelligent diagnosis test accuracy.

[0055] If the electromagnetic interference signal positioning indicators need to be accurately understood, it is necessary to obtain the characteristics of the interaction of the electromagnetic interference signal positioning indicators and conduct a holistic analysis. Due to the high-speed operation of the low-orbit satellite module, the arrival time difference of the electromagnetic interference signal becomes larger, resulting in an increase in the arrival time difference indicator of the electromagnetic interference signal, causing the relative position of the electromagnetic interference signal to change all the time, resulting in an increase in the change in the amplitude of the electromagnetic interference signal, which in turn leads to an increase in the arrival amplitude indicator of the electromagnetic interference signal. Due to the increase in the arrival time difference indicator of the electromagnetic interference signal, the distance difference between the electromagnetic interference signal and the phased array antenna increases, resulting in an increase in the difference in the arrival angle of the electromagnetic interference signal, which in turn leads to an increase in the arrival angle indicator of the electromagnetic interference signal, thereby achieving the effect of improving the accuracy of the intelligent diagnosis test of electromagnetic interference of the low-orbit satellite module.

[0056] Furthermore, the specific process of optimizing electromagnetic interference signal positioning is as follows: performing the operation of dividing the receiving time points means that the time window for receiving the electromagnetic interference signal is adjusted with the amplitude corresponding to the preset ratio of the number of electromagnetic interference signal time points as the adjustment step, and gradually increasing the number of electromagnetic interference signal time points N on the basis of the original number of electromagnetic interference signal time points N. When the number of electromagnetic interference signal time points monitored reaches the preset minimum number of electromagnetic interference signal time points, and the electromagnetic interference signal positioning impact result still does not meet the electromagnetic interference signal positioning qualification conditions, adaptive filtering processing is performed; for example, the preset ratio of the number of electromagnetic interference signal time points k, the number of original electromagnetic interference signal time points N 0， The amplitude of each adjustment step is k, the range of k is 0-1, and the number of electromagnetic interference signal time points increased each time should be the product of N0 and k. The number of electromagnetic interference signal time points after adjustment N m The formula for the mth adjustment can be expressed as: ; When m=0, N k=N0, as m increases, the number of time points increases step by step, and the magnitude of each increase is k times the previous number. The number of electromagnetic interference signal time points is greater than the preset minimum number of electromagnetic interference signal time points, and the preset minimum number of electromagnetic interference signal time points is set by a preset personnel, wherein the number of electromagnetic interference signal time points of each antenna receiving end is preset by monitoring the preset receiving time period with an oscilloscope; the preset ratio of the number of electromagnetic interference signal time points is obtained by inputting the electromagnetic interference signal positioning impact result and the time window length into the database, wherein the database contains an electromagnetic interference signal time point correction set, which is used to reflect the correction relationship between the electromagnetic interference signal positioning impact result and the time window length and the corresponding preset ratio of the number of electromagnetic interference signal time points; if the electromagnetic interference signal positioning impact result obtained after the division of the receiving time point operation meets the electromagnetic interference signal positioning qualification condition, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database for low-orbit satellite module electromagnetic interference intelligent diagnosis test, otherwise, adaptive filtering processing is performed; the division of the receiving time point operation is used to reduce the electromagnetic interference signal positioning deviation, expand the effective sample range, reduce the influence of the observation error of a single low-orbit satellite module on the received electromagnetic interference signal positioning result, and indirectly suppress the random error that may occur in the time difference calculation, thereby reducing the electromagnetic interference signal receiving angle measurement deviation and The amplitude deviation caused by the attenuation of the electromagnetic interference signal amplitude is used to improve the stability and accuracy of the electromagnetic interference data in the process of electromagnetic interference signal positioning, and provide more reliable input parameters for the electromagnetic interference database; adaptive filtering processing means that the received electromagnetic interference signal is decomposed and simulated based on the adaptive filtering method to obtain the low-orbit satellite electromagnetic interference signal and synthesize the low-orbit satellite electromagnetic interference signal into a virtual electromagnetic interference signal; for example, by monitoring the in-band flatness deviation of the filter on the low-orbit satellite module, it is judged whether the adaptive filtering processing is qualified, and the preset receiving time period is monitored by the vector network analyzer to preset the receiving end of each antenna The actual in-band flatness of the filter and the in-band flatness deviation result are represented by the difference between the actual in-band flatness and the preset in-band flatness. When the in-band flatness deviation result is within the preset in-band flatness deviation result range, it indicates that the adaptive filtering process is qualified. Otherwise, a notification indicating that the adaptive filtering process is unqualified is sent to the preset personnel. The preset in-band flatness is represented by the average in-band flatness value over a historical time period, and the preset in-band flatness deviation result range is represented by the maximum and minimum in-band flatness deviation results over a historical time period. The preset in-band flatness deviation result range includes both the maximum and minimum values ​​of the in-band flatness deviation results.The in-band flatness deviation result helps suppress interference signals of different frequency components, avoiding new error sources caused by frequency selective fading, thereby reducing the electromagnetic interference signal positioning index and improving the accuracy of the electromagnetic interference data. When the electromagnetic interference signal positioning impact result is monitored to meet the electromagnetic interference signal positioning qualification conditions, the adaptive filtering process is stopped. The low-orbit satellite electromagnetic interference signal indicates that the number of received electromagnetic interference signals is greater than the electromagnetic interference signal corresponding to the number of originally received electromagnetic interference signals. If the electromagnetic interference signal positioning impact result re-acquired after adaptive filtering meets the electromagnetic interference signal positioning qualification conditions, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database for use in the low-orbit satellite module electromagnetic interference intelligent diagnosis test. Otherwise, an electromagnetic interference signal positioning optimization abnormality prompt is sent to the preset personnel.

[0057] In this embodiment, by performing electromagnetic interference signal positioning optimization, the source of electromagnetic interference signal positioning error can be quantified, the omission of electromagnetic interference signal characteristics due to insufficient electromagnetic interference signal characteristic information can be avoided, the positioning deviation caused by the lack of electromagnetic interference signal characteristic information can be reduced, and the true electromagnetic interference signal characteristics can be retained while eliminating noise components, thereby improving the measurement accuracy of key characteristic information such as the electromagnetic interference signal arrival time difference and the electromagnetic interference signal angle, and ultimately achieving an improvement in the accuracy of electromagnetic interference signal positioning.

[0058] Furthermore, the specific process of storing the corresponding electromagnetic interference signal and positioning coordinates in the electromagnetic interference database is as follows: input the electromagnetic interference signal and positioning coordinates that meet the electromagnetic interference signal positioning qualification conditions into the electromagnetic interference database; compare the electromagnetic interference signal and positioning coordinates input into the electromagnetic interference database with the original electromagnetic interference signal and positioning coordinates in the electromagnetic interference database; if the electromagnetic interference signal and positioning coordinates input into the electromagnetic interference database match the original electromagnetic interference signal and positioning coordinates in the electromagnetic interference database, that is, the electromagnetic interference signal and positioning coordinates input into the electromagnetic interference database are the same as the original electromagnetic interference signal and positioning coordinates in the electromagnetic interference database, then the corresponding electromagnetic interference signal and positioning coordinates are marked as existing electromagnetic interference data, otherwise, they are marked as non-existent electromagnetic interference data and updated to the electromagnetic interference database for use in low-orbit satellite module electromagnetic interference intelligent diagnosis test.

[0059] In this embodiment, the electromagnetic interference database is included in the database, which is used to store electromagnetic interference signals and their positioning coordinates, providing an electromagnetic interference data basis for the electromagnetic interference intelligent diagnosis test of the low-orbit satellite module. It can effectively identify the electromagnetic interference signals and their positioning coordinates that already exist in the historical records, avoid repeated storage, and thus continuously enrich and correct the electromagnetic interference database, ensuring the accuracy and timeliness of the electromagnetic interference database, and providing reliable electromagnetic interference data support for the electromagnetic interference intelligent diagnosis test of the low-orbit satellite module, thereby improving the ability to identify electromagnetic interference signals.

[0060] Further, as an implementation method of the second aspect, Figure 4 As shown, it is a structural schematic diagram of a low-orbit satellite module electromagnetic interference intelligent diagnosis and testing system provided in an embodiment of the present application, including an electromagnetic interference signal frequency deviation evaluation module, an electromagnetic interference signal reception evaluation module and an electromagnetic interference signal positioning accuracy evaluation module: wherein, the electromagnetic interference signal frequency deviation evaluation module is used to perform electromagnetic interference signal frequency deviation evaluation during the electromagnetic interference acquisition process of the low-orbit satellite module to determine whether to perform electromagnetic interference frequency deviation optimization; the electromagnetic interference signal reception evaluation module is used to determine whether to perform electromagnetic interference signal positioning accuracy evaluation based on the electromagnetic interference signal reception qualification conditions; the electromagnetic interference signal positioning accuracy evaluation module is used to perform electromagnetic interference signal positioning accuracy evaluation to determine whether to perform electromagnetic interference signal positioning optimization.

[0061] In this embodiment, the electromagnetic interference signal frequency deviation evaluation module, the electromagnetic interference signal reception evaluation module and the electromagnetic interference signal positioning accuracy evaluation module interact and are interconnected. The electromagnetic interference signal frequency deviation evaluation module is used to perform electromagnetic interference signal frequency deviation evaluation during the electromagnetic interference acquisition process of the low-orbit satellite module, and judge whether the electromagnetic interference frequency deviation change qualification conditions are met according to the electromagnetic interference frequency deviation change result to judge whether to perform electromagnetic interference frequency deviation optimization; the electromagnetic interference signal reception evaluation module is used to perform electromagnetic interference signal reception evaluation, and judge whether the electromagnetic interference signal reception qualification conditions are met according to the electromagnetic interference signal time difference deviation result to judge whether to perform electromagnetic interference signal positioning accuracy evaluation; the electromagnetic interference signal positioning accuracy evaluation module is used to perform electromagnetic interference signal positioning accuracy evaluation, and judge whether the electromagnetic interference signal positioning qualification conditions are met according to the electromagnetic interference signal positioning impact result to judge whether to perform electromagnetic interference signal positioning optimization, thereby achieving the improvement of the accuracy of the low-orbit satellite module electromagnetic interference intelligent diagnosis test method.

[0062] In summary, the embodiments of the present application, first, perform electromagnetic interference signal frequency deviation evaluation to obtain electromagnetic interference frequency deviation change results, and judge whether the electromagnetic interference frequency deviation change qualification conditions are met based on the electromagnetic interference frequency deviation change results to judge whether to perform electromagnetic interference frequency deviation optimization, which helps to accurately evaluate the electromagnetic interference signal type of the low-orbit satellite module and avoid confusing the electromagnetic interference signal with the normal communication signal or natural noise, thereby improving the accuracy of electromagnetic interference signal positioning; secondly, perform electromagnetic interference signal reception evaluation to obtain electromagnetic interference signal time difference deviation results, and judge whether the electromagnetic interference signal reception qualification conditions are met based on the electromagnetic interference signal time difference deviation results to judge whether to perform Performing electromagnetic interference signal positioning accuracy assessment helps to improve the accuracy of electromagnetic interference signal identification; finally, performing electromagnetic interference signal positioning accuracy assessment to obtain electromagnetic interference signal positioning impact results, and judging whether the electromagnetic interference signal positioning qualification conditions are met based on the electromagnetic interference signal positioning impact results to judge whether to perform electromagnetic interference signal positioning optimization, helps to accurately assess the impact of multi-dimensional errors on the identification and positioning of electromagnetic interference signals, further narrow the location range of the electromagnetic interference signal source, avoid misjudgment due to electromagnetic interference signal reflection or multipath effect, and thus enhance the low-orbit satellite module's adaptive anti-interference capability in identifying and positioning electromagnetic interference signals.

[0063] There are a few points to note:

[0064] (1) The drawings of the embodiments of the present invention only relate to the structures related to the embodiments of the present invention. Other structures may refer to conventional designs.

[0065] (2) For the sake of clarity, the thickness of layers or regions in the drawings used to describe the embodiments of the present invention are exaggerated or reduced, that is, these drawings are not drawn to scale. It is understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element may be "directly on" or "under" the other element or intervening elements may be present.

[0066] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to form new embodiments.

[0067] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A low-orbit satellite module electromagnetic interference intelligent diagnosis and testing method, characterized in that: The following steps are involved: During the electromagnetic interference collection process of the low-orbit satellite module, an electromagnetic interference signal frequency offset evaluation is performed to determine whether to perform electromagnetic interference frequency offset optimization. The electromagnetic interference frequency offset optimization means adjusting the frequency band of the electromagnetic interference signal and the electromagnetic interference signal frequency collection range by performing sequence spread spectrum optimization and orthogonal multiplexing optimization. The sequence spread spectrum optimization means ensuring the synchronization of the spread spectrum code of the electromagnetic interference signal by performing sequence spread spectrum processing and adjusting the spread spectrum code frequency. The orthogonal multiplexing optimization means reducing the electromagnetic interference signal collection range by performing orthogonal multiplexing processing and reducing the electromagnetic interference signal frequency collection radius operation; Perform electromagnetic interference signal reception evaluation, determine whether the electromagnetic interference signal reception qualification condition is met based on the electromagnetic interference signal time difference deviation result, and determine whether to perform electromagnetic interference signal positioning accuracy evaluation based on the electromagnetic interference signal reception qualification condition. If the obtained electromagnetic interference signal time difference deviation result meets the electromagnetic interference signal reception qualification condition, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database; otherwise, perform electromagnetic interference signal positioning accuracy evaluation; If an electromagnetic interference signal positioning accuracy assessment is performed, it is determined whether to perform electromagnetic interference signal positioning optimization based on the electromagnetic interference signal positioning impact result. If the electromagnetic interference signal positioning optimization is not performed, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database. The electromagnetic interference signal positioning optimization means dividing the receiving time points and performing adaptive filtering processing to cover the electromagnetic interference signal range.

2. A low-orbit satellite module electromagnetic interference intelligent diagnosis and testing method as claimed in claim 1, characterized in that: The specific process of performing electromagnetic interference signal frequency deviation evaluation to determine whether to perform electromagnetic interference frequency deviation optimization is as follows: Obtaining the electromagnetic interference frequency deviation change result and determining whether it meets the electromagnetic interference frequency deviation change qualification condition; If the electromagnetic interference frequency offset change result meets the electromagnetic interference frequency offset change qualification condition, the electromagnetic interference signal reception evaluation is performed; otherwise, the electromagnetic interference frequency offset optimization is performed, including resampling operation, sequence spread spectrum optimization, and orthogonal multiplexing optimization; The electromagnetic interference frequency deviation change qualified condition indicates that the electromagnetic interference frequency deviation change result is less than the preset electromagnetic interference frequency deviation change result; The re-sampling operation means that the low-orbit satellite module re-sampling the electromagnetic interference signal.

3. A low-orbit satellite module electromagnetic interference intelligent diagnosis and testing method as claimed in claim 2, characterized in that: The specific process of performing sequence spread spectrum optimization is as follows: The performing of sequence spread spectrum optimization means performing sequence spread spectrum processing and spreading code frequency adjustment simultaneously; The performing sequence spread spectrum processing means mapping the original electromagnetic interference signal to the satellite electromagnetic interference signal frequency band by setting a spread spectrum code, and performing despreading based on the same spread spectrum code set based on radio frequency signal processing, thereby restoring the original electromagnetic interference signal; The satellite electromagnetic interference signal frequency band indicates that the satellite electromagnetic interference signal frequency band is greater than the frequency band corresponding to the original satellite electromagnetic interference signal frequency band; The sequence spread spectrum processing is used to disperse the energy of the original electromagnetic interference signal into a wider frequency band; The spreading code frequency adjustment is to increase the spreading code frequency step by step with the amplitude corresponding to the preset spreading code frequency ratio as the adjustment step; The preset spread spectrum code frequency ratio is obtained by inputting the electromagnetic interference frequency deviation change result and the electromagnetic interference signal frequency into a database; The frequency adjustment of the spread spectrum code is used to reduce the peak value of the electromagnetic interference signal during despreading, ensure that the spread spectrum code of the electromagnetic interference signal remains synchronized, and accurately compensate for the frequency deviation of the electromagnetic interference signal; If the electromagnetic interference frequency offset change result reacquired after sequence spread spectrum optimization meets the electromagnetic interference frequency offset change qualification condition, electromagnetic interference signal reception evaluation is performed; otherwise, orthogonal multiplexing optimization is performed.

4. A low-orbit satellite module electromagnetic interference intelligent diagnosis and testing method as claimed in claim 3, characterized in that: The orthogonal multiplexing optimization includes simultaneously performing orthogonal multiplexing processing and reducing the electromagnetic interference signal frequency acquisition radius operation; The orthogonal multiplexing processing means projecting the received electromagnetic interference signal after sequence spread spectrum optimization into a preset angular domain space, suppressing Doppler shift based on conjugate multiplication and detecting local synchronization sequence correlation peaks to achieve high-precision timing synchronization; The operation of reducing the electromagnetic interference signal frequency acquisition radius means reducing the electromagnetic interference signal frequency acquisition radius step by step with an amplitude corresponding to a preset electromagnetic interference signal frequency acquisition radius ratio as an adjustment step; The preset electromagnetic interference signal frequency acquisition radius ratio is obtained by inputting the electromagnetic interference frequency deviation change result and the electromagnetic interference signal frequency acquisition range into a database; If the electromagnetic interference frequency offset change result obtained after orthogonal multiplexing optimization meets the electromagnetic interference frequency offset change qualification condition, the electromagnetic interference signal reception evaluation is performed; otherwise, an electromagnetic interference frequency offset optimization exception is sent to the preset personnel; The orthogonal multiplexing process is used to reduce the frequency deviation of the electromagnetic interference signal; The operation of reducing the electromagnetic interference signal frequency acquisition radius is used to speed up the acquisition of the electromagnetic interference signal.

5. The method for intelligent diagnosis and testing of electromagnetic interference of a low-orbit satellite module according to claim 1, wherein: The specific process of judging whether the electromagnetic interference signal reception qualification condition is met based on the electromagnetic interference signal time difference deviation result is as follows: Obtain the time difference deviation result of the electromagnetic interference signal and determine whether it meets the electromagnetic interference signal reception qualification conditions; The electromagnetic interference signal time difference deviation result is used to quantitatively evaluate the electromagnetic interference signal reception time, thereby determining the electromagnetic interference signal transmission direction; The electromagnetic interference signal reception qualified condition indicates that the electromagnetic interference signal time difference deviation result is within the electromagnetic interference signal time difference deviation result range.

6. The method for intelligent diagnosis and testing of electromagnetic interference of a low-orbit satellite module according to claim 1, wherein: If the electromagnetic interference signal positioning accuracy evaluation is performed, it is determined whether to perform electromagnetic interference signal positioning optimization based on the electromagnetic interference signal positioning impact result. The specific process is as follows: Obtain the electromagnetic interference signal positioning impact results and determine whether they meet the electromagnetic interference signal positioning qualification conditions; If the electromagnetic interference signal positioning impact result meets the electromagnetic interference signal positioning qualification condition, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database; otherwise, the electromagnetic interference signal positioning optimization is performed; The electromagnetic interference signal positioning impact result is used to quantify the comprehensive impact of error sources in multiple dimensions on the positioning result, thereby monitoring the stability of the low-orbit satellite module in receiving electromagnetic interference signals in a complex environment in real time.

7. A low-orbit satellite module electromagnetic interference intelligent diagnosis and testing method as claimed in claim 6, characterized in that: The specific process of obtaining the electromagnetic interference signal positioning impact result is as follows: The electromagnetic interference signal positioning deviation value is combined with the corresponding signal positioning control rate to perform weighted calculation to obtain the electromagnetic interference signal positioning index; The electromagnetic interference signal positioning indicators include: electromagnetic interference signal arrival time difference indicator, electromagnetic interference signal arrival angle indicator and electromagnetic interference signal arrival amplitude indicator; The electromagnetic interference signal positioning deviation value is obtained by quantitatively comparing the electromagnetic interference signal positioning impact result with the preset electromagnetic interference signal positioning impact result, including: the electromagnetic interference signal time difference deviation result, the electromagnetic interference signal arrival angle deviation result and the electromagnetic interference signal amplitude deviation result; The electromagnetic interference signal positioning impact result includes: electromagnetic interference signal arrival time difference, electromagnetic interference signal arrival angle and electromagnetic interference signal arrival amplitude; The signal positioning control rate is used to reflect the degree of influence of the electromagnetic interference signal positioning deviation value on the electromagnetic interference signal positioning result; The electromagnetic interference signal positioning index is multi-dimensionally coupled to obtain the electromagnetic interference signal positioning impact result, which is used to reflect the comprehensive effect of the electromagnetic interference signal positioning deviation value on the accuracy of the electromagnetic interference signal positioning impact result.

8. The intelligent diagnostic test method for electromagnetic interference of a low-orbit satellite module according to claim 6, characterized in that: The specific process of performing electromagnetic interference signal positioning optimization is as follows: AA1, performing the operation of dividing the receiving time points: the time window for receiving the electromagnetic interference signal is adjusted with an amplitude corresponding to the ratio of the number of preset electromagnetic interference signal time points as the step size; The preset electromagnetic interference signal time point quantity ratio is obtained by inputting the electromagnetic interference signal positioning impact result and the time window length into the database; If the electromagnetic interference signal positioning impact result reacquired after dividing the receiving time point operation meets the electromagnetic interference signal positioning qualification condition, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database for the low-orbit satellite module electromagnetic interference intelligent diagnosis test; otherwise, execute AA2; AA2, performing adaptive filtering processing: decomposing and simulating the received electromagnetic interference signal to obtain the low-orbit satellite electromagnetic interference signal, and synthesizing the low-orbit satellite electromagnetic interference signal into a virtual electromagnetic interference signal; The low-orbit satellite electromagnetic interference signal indicates that the number of received electromagnetic interference signals is greater than the electromagnetic interference signal corresponding to the number of originally received electromagnetic interference signals; If the electromagnetic interference signal positioning impact result obtained after adaptive filtering processing meets the electromagnetic interference signal positioning qualification conditions, the corresponding electromagnetic interference signal and positioning coordinates will be stored in the electromagnetic interference database; otherwise, an electromagnetic interference signal positioning optimization abnormality prompt will be sent to the preset personnel.

9. A low-orbit satellite module electromagnetic interference intelligent diagnosis and testing method as claimed in claim 8, characterized in that: The specific process of storing the corresponding electromagnetic interference signal and positioning coordinates in the electromagnetic interference database is as follows: Inputting electromagnetic interference signals and positioning coordinates that meet the electromagnetic interference signal positioning qualification conditions into the electromagnetic interference database; Comparing the electromagnetic interference signal and positioning coordinates input into the electromagnetic interference database with the original electromagnetic interference signal and positioning coordinates in the electromagnetic interference database; If the electromagnetic interference signal and positioning coordinates input into the electromagnetic interference database match the original electromagnetic interference signal and positioning coordinates in the electromagnetic interference database, the corresponding electromagnetic interference signal and positioning coordinates will be marked as existing electromagnetic interference data; otherwise, they will be marked as non-existent electromagnetic interference data and updated to the electromagnetic interference database.

10. A low-orbit satellite module electromagnetic interference intelligent diagnosis and testing system, using the low-orbit satellite module electromagnetic interference intelligent diagnosis and testing method according to any one of claims 1 to 9, characterized in that: It includes electromagnetic interference signal frequency deviation evaluation module, electromagnetic interference signal reception evaluation module and electromagnetic interference signal positioning accuracy evaluation module: The electromagnetic interference signal frequency deviation evaluation module is used to perform electromagnetic interference signal frequency deviation evaluation during the electromagnetic interference acquisition process of the low-orbit satellite module to determine whether to perform electromagnetic interference frequency deviation optimization; The electromagnetic interference signal reception evaluation module is used to perform electromagnetic interference signal reception evaluation, determine whether the electromagnetic interference signal reception qualification condition is met based on the electromagnetic interference signal time difference deviation result, and determine whether to perform electromagnetic interference signal positioning accuracy evaluation based on the electromagnetic interference signal reception qualification condition. If the obtained electromagnetic interference signal time difference deviation result meets the electromagnetic interference signal reception qualification condition, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database; otherwise, the electromagnetic interference signal positioning accuracy evaluation is performed; The electromagnetic interference signal positioning accuracy assessment module is used to determine whether to perform electromagnetic interference signal positioning optimization based on the electromagnetic interference signal positioning impact result when performing electromagnetic interference signal positioning accuracy assessment. If electromagnetic interference signal positioning optimization is not performed, the corresponding electromagnetic interference signal and positioning coordinates are stored in the electromagnetic interference database.

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