Satellite-ground linkage radio monitoring system and method based on low earth orbit satellite

Abstract

The invention discloses a satellite-ground linkage radio monitoring system and method based on a low-orbit satellite, and relates to the field of wireless communication, and the system comprises a radio monitoring load which is disposed on the low-orbit satellite, and is used for carrying out the beam tracking of a to-be-monitored satellite radio system according to a radio monitoring task, carrying out the coarse processing of a collected signal, and obtaining signal data, sending the signal data to a low-earth-orbit satellite to enable the low-earth-orbit satellite to adjust the position of the low-earth-orbit satellite and the direction of a radio monitoring load beam, carrying out space-time marking on the signal data, and then sending the signal data to a ground station; the radio monitoring data processing module is deployed on a ground station and is used for generating a radio monitoring task according to the operation orbit and the beam coverage condition of the satellite radio system to be monitored and uploading the radio monitoring task to a low-orbit satellite; and carrying out precision processing on the signal data to obtain a running orbit and a beam coverage condition of the satellite radio system to be monitored, and updating a radio monitoring task. According to the invention, satellite-ground linkage radio monitoring can be realized, and monitoring of signals of multiple frequency bands is realized.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a satellite-to-ground linkage radio monitoring system and method based on a low-orbit satellite. Background Art

[0002] With the development of science and technology, radio applications and radio communications have become indispensable in life. At present, there are a large number of satellite-based radio monitoring systems, such as the American Baiyun series, SB-WAAS, Russian Lotus series, Russian Peony series, French Swarm, Hawkeye 360, Kleos Space, Unseenlabs, etc. The satellite-based radio monitoring system mainly uses a low-orbit satellite platform about 500-1000km away from the ground to conduct spectrum situation awareness and signal emission source positioning on the ground. Among them, the satellite-based radio monitoring system of the American Baiyun series, SB-WAAS, Russian Lotus series, and Russian Peony series has a payload mass of 600-7000kg, and adopts positioning methods such as three-star time-frequency difference positioning, dual-star time-frequency difference positioning, and single-star interferometer direction finding positioning. The positioning accuracy can reach up to 1km, integrating multiple tasks such as radar monitoring, communication, measurement and control, and navigation, and also has optical imaging and synthetic aperture imaging functions. The satellite-based radio monitoring systems of France Swarm, Hawkeye 360, Kleos Space and Unseenlabs are characterized by miniaturization, about 500km from the ground, with a payload mass of 6-50kg. They have relatively simple functions and are mainly used to complete electromagnetic spectrum situation awareness and signal source positioning of ground radio signals. They are mainly positioned through the three-star time-frequency difference, with a positioning accuracy of less than 3km and limited coverage of frequency bands.

[0003] However, the current mature satellite-based radio monitoring systems are mainly aimed at ground radio signals, mainly covering maritime radio systems and land radio systems, with limited frequency coverage. They do not consider the monitoring of signals from satellite radio systems such as satellite communication systems and satellite navigation systems, as well as other new frequency band signals, and cannot cover Ka-band and Ku-band satellite communication signals.

[0004] In addition, with the development of low-orbit satellite constellations, some studies have proposed using low-orbit satellite constellations to complete signal monitoring of satellite radio systems. For example, the Chinese patent document with publication number CN110794425A and invention name "A navigation enhancement system based on low-orbit constellation monitoring GNSS signals and broadcasting GNSS frequency band navigation enhancement signals" discloses a navigation enhancement system, which uses low-orbit satellite constellations to receive GNSS signals, obtain positioning results, analyze the orbit, clock error, code deviation and carrier phase deviation of GNSS signals, and broadcast information to complete the navigation enhancement task. However, the system only analyzes and counts the signal reception performance and tracking parameters of satellite navigation signals, and does not consider the linkage between low-orbit satellite constellations and ground, as well as radio monitoring of other satellite systems, and the monitoring efficiency is poor. Summary of the invention

[0005] In order to solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a satellite-ground linkage radio monitoring system and method based on a low-orbit satellite.

[0006] The technical solution of the present invention is as follows: In a first aspect, a satellite-to-ground radio monitoring system based on a low-orbit satellite is provided, comprising: A radio monitoring payload is deployed on a low-orbit satellite and is used to perform beam tracking of a radio system of a satellite to be monitored according to a received radio monitoring task, monitor and collect signals of L-band, Ka-band, Ku-band, X-band, C-band and S-band, perform rough processing on the signals to obtain signal data including signal strength, signal frequency, bandwidth and modulation mode, send the signal data to the low-orbit satellite so that the low-orbit satellite adjusts its own position and the beam pointing direction of the radio monitoring payload, and perform time-space marking on the signal data and send it to the low-orbit satellite so that the low-orbit satellite sends the signal data to a ground station; The radio monitoring data processing module is deployed on the ground station and is used to generate a radio monitoring task according to the operating orbit and beam coverage of the satellite radio system to be monitored and send it to the ground station so that the ground station can inject the radio monitoring task to the low-orbit satellite, perform fine processing on the received signal data, and associate the signal data with time and space information to obtain the operating orbit, beam coverage and radio electromagnetic situation of the satellite radio system to be monitored, and update the radio monitoring task according to the obtained operating orbit and beam coverage of the satellite radio system to be monitored.

[0007] In some optional embodiments, the radio monitoring payload includes: L-band receiving phased array, used to monitor and collect L-band signals; Ka / Ku-band receiving phased array, used to monitor and collect Ka-band and Ku-band signals; XCS band antenna, used to monitor and collect signals in X-band, C-band and S-band; The signal comprehensive processing module is respectively connected to the L-band receiving phased array, the Ka / Ku-band receiving phased array, the XCS-band antenna, the satellite computer on the low-orbit satellite and the communication payload on the low-orbit satellite, and is used to perform beam tracking of the radio system of the satellite to be monitored according to the received radio monitoring task, perform rough processing on the collected signal to obtain signal data including signal strength, signal frequency, bandwidth and modulation mode, send the signal data to the low-orbit satellite so that the low-orbit satellite adjusts its own position, adjusts the beam pointing of the L-band receiving phased array, adjusts the beam pointing of the Ka / Ku-band receiving phased array and adjusts the beam pointing of the XCS-band antenna, and sends the signal data to the low-orbit satellite after time-space marking so that the low-orbit satellite sends the signal data to the ground station.

[0008] In some optional implementations, the radio monitoring data processing module is deployed on a cloud platform of the ground station, and the radio monitoring data processing module includes: A task planning unit, used for generating a radio monitoring task according to the operating orbit and beam coverage of the satellite radio system to be monitored and sending the task to the ground station so that the ground station can inject the radio monitoring task to the low-orbit satellite; The radio monitoring processing unit is connected to the task planning unit, and is used to perform fine processing on the received signal data, and to perform correlation processing on the signal data and the time and space information, so as to obtain the operating orbit, beam coverage and radio electromagnetic situation of the satellite radio system to be monitored, and to send the obtained operating orbit and beam coverage of the satellite radio system to be monitored to the task planning unit so that the task planning unit updates the radio monitoring task.

[0009] In a second aspect, a satellite-to-ground radio monitoring method based on a low-orbit satellite is also provided. The method applies the above-mentioned satellite-to-ground radio monitoring system based on a low-orbit satellite, including: Determine the orbit and beam coverage of the satellite radio system to be monitored, determine the theoretical orbit of the low-orbit satellite when performing the radio monitoring task based on the orbit and beam coverage of the satellite radio system to be monitored, generate a radio monitoring task including theoretical orbit information, the orbit and beam coverage of the satellite radio system to be monitored, and annotate it to the low-orbit satellite used to perform the radio monitoring task; Controlling the low-orbit satellite receiving the radio monitoring task to move to the theoretical operating orbit, using the radio monitoring payload to monitor and collect signals in real time, roughly processing the signals after collecting them to obtain signal data including signal strength, signal frequency, bandwidth and modulation mode, performing feedback adjustment on the low-orbit satellite position and the radio monitoring payload beam pointing according to the obtained signal strength until the obtained signal strength reaches a maximum, after completing the feedback adjustment on the low-orbit satellite position and the radio monitoring payload beam pointing, roughly processing the collected signals to obtain signal data including signal strength, signal frequency, bandwidth and modulation mode, and sending the obtained signal data to the low-orbit satellite after time-space marking so that the low-orbit satellite sends the signal data to the ground station; The radio monitoring data processing module is used to precisely process the received signal data, and the signal data is correlated with the time and space information to obtain the orbit, beam coverage and radio electromagnetic situation of the satellite radio system to be monitored; The theoretical orbit of the low-orbit satellite when performing the radio monitoring task is determined based on the obtained orbit and beam coverage of the satellite radio system to be monitored. The low-orbit satellite used to perform the radio monitoring task is determined based on the determined theoretical orbit and the actual orbits and fuel inventories of all low-orbit satellites deployed with radio monitoring payloads at the current moment. A radio monitoring task including the theoretical orbit information, the orbit and beam coverage of the satellite radio system to be monitored is generated and uploaded to the determined low-orbit satellite used to perform the radio monitoring task.

[0010] In some optional embodiments, the method further comprises: The performance curve of the radio signal is drawn based on the precise processing results of the signal data, and the service performance of the satellite radio system to be monitored is checked to see if there are any problems.

[0011] The main advantages of the technical solution of the present invention are as follows: The satellite-to-ground linkage radio monitoring system and method based on low-orbit satellite of the present invention deploys a radio monitoring payload on the low-orbit satellite and a radio monitoring data processing module on the ground station, uses the radio monitoring payload to monitor satellite radio system signals and other frequency band signals, and simultaneously transmits signal data to the ground station, completes signal data processing at the ground station, and feeds back information to the low-orbit satellite based on the signal data processing result to adjust the operating status of the low-orbit satellite. It can fully integrate the on-board processing capability and the ground processing capability to realize satellite-to-ground linkage radio monitoring, significantly improve the flexibility and efficiency of radio monitoring, and can realize the monitoring of multiple frequency band signals including satellite radio system signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the embodiments of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 A structural block diagram of a satellite-to-ground linkage radio monitoring system based on a low-orbit satellite provided by an embodiment of the present invention; Figure 2 A flow chart of a satellite-to-ground coordinated radio monitoring method based on a low-orbit satellite is provided in an embodiment of the present invention.

[0013] Description of reference numerals: 1- Radio monitoring payload, 11- L-band receiving phased array, 12- Ka / Ku-band receiving phased array, 13- XCS-band antenna, 14- Signal integrated processing module; 2-radio monitoring data processing module, 21-mission planning unit, 22-radio monitoring processing unit. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0015] The technical solution provided by the embodiments of the present invention is described in detail below with reference to the accompanying drawings.

[0016] refer to Figure 1 In a first aspect, an embodiment of the present invention provides a satellite-ground linkage radio monitoring system based on a low-orbit satellite, the system comprising: The radio monitoring payload 1 is deployed on the low-orbit satellite and is used to perform beam tracking of the radio system of the satellite to be monitored according to the received radio monitoring task, monitor and collect signals of the L-band, Ka-band, Ku-band, X-band, C-band and S-band, perform rough processing on the signals to obtain signal data including signal strength, signal frequency, bandwidth and modulation mode, send the signal data to the low-orbit satellite so that the low-orbit satellite adjusts its own position and the beam pointing of the radio monitoring payload 1, and perform time and space marking on the signal data and then send it to the low-orbit satellite so that the low-orbit satellite sends the signal data to the ground station; The radio monitoring data processing module 2 is deployed on the ground station and is used to generate a radio monitoring task according to the operating orbit and beam coverage of the satellite radio system to be monitored and send it to the ground station so that the ground station can inject the radio monitoring task into the low-orbit satellite, perform fine processing on the received signal data, and associate the signal data with the time and space information to obtain the operating orbit, beam coverage and radio electromagnetic situation of the satellite radio system to be monitored, and update the radio monitoring task according to the obtained operating orbit and beam coverage of the satellite radio system to be monitored.

[0017] It should be noted that the L band represents the radio band with a frequency of 1~2GHz, the S band represents the radio band with a frequency of 2~4GHz, the C band represents the radio band with a frequency of 4~8GHz, the X band represents the radio band with a frequency of 8~12GHz, the Ku band represents the radio band with a frequency of 12~18GHz, and the Ka band represents the radio band with a frequency of 27~40GHz.

[0018] The satellite-ground linkage radio monitoring system based on low-orbit satellite provided by an embodiment of the present invention deploys a radio monitoring payload 1 on the low-orbit satellite and a radio monitoring data processing module 2 on the ground station, uses the radio monitoring payload 1 to monitor satellite radio system signals and other frequency band signals, and simultaneously transmits signal data to the ground station, completes signal data processing at the ground station, and feeds back information to the low-orbit satellite based on the signal data processing result to adjust the operating status of the low-orbit satellite. It can fully integrate the on-board processing capability and the ground processing capability to realize satellite-ground linkage radio monitoring, significantly improve the flexibility and efficiency of radio monitoring, and can realize the monitoring of multiple frequency band signals including satellite radio system signals.

[0019] Furthermore, in an embodiment of the present invention, the satellite-ground linkage radio monitoring system based on a low-orbit satellite can work in the following manner: The operating orbit and beam coverage of the satellite radio system to be monitored are determined in advance and sent to the radio monitoring data processing module 2. The radio monitoring data processing module 2 determines the theoretical operating orbit of the low-orbit satellite when performing the radio monitoring task according to the operating orbit and beam coverage of the satellite radio system to be monitored, generates a radio monitoring task including theoretical operating orbit information, the operating orbit and beam coverage of the satellite radio system to be monitored, and sends it to the ground station, so that the ground station can inject the radio monitoring task into the low-orbit satellite used to perform the radio monitoring task; after receiving the radio monitoring task, the low-orbit satellite moves to the theoretical operating orbit, and sends the radio monitoring task to the radio monitoring payload 1 deployed thereon, and the radio monitoring payload 1 performs beam tracking of the satellite radio system to be monitored according to the received radio monitoring task, monitors and collects signals of the L-band, Ka-band, Ku-band, X-band, C-band, and S-band, performs rough processing on the signal to obtain signal data including signal strength, signal frequency, bandwidth, and modulation mode, and sends the signal data to the low-orbit satellite so that the low-orbit satellite can adjust its own position and the beam pointing of the radio monitoring payload 1, and processes the signal data. After the signal data is time-space marked, it is sent to the low-orbit satellite so that the low-orbit satellite sends the signal data to the ground station; after receiving the signal data, the ground station sends the signal data to the radio monitoring data processing module 2, and the radio monitoring data processing module 2 performs fine processing on the received signal data, and associates the signal data with the time-space information to obtain the operating orbit, beam coverage and radio electromagnetic situation of the satellite radio system to be monitored; after obtaining the operating orbit and beam coverage of the satellite radio system to be monitored, the radio monitoring data processing module 2 determines the theoretical operating orbit of the low-orbit satellite when performing the radio monitoring task according to the latest operating orbit and beam coverage of the satellite radio system to be monitored, generates a radio monitoring task including the theoretical operating orbit information, the operating orbit and beam coverage of the satellite radio system to be monitored, and sends it to the ground station, so that the ground station injects the updated radio monitoring task into the low-orbit satellite used to perform the radio monitoring task, so that the low-orbit satellite and the radio monitoring payload 1 deployed thereon perform subsequent actions according to the updated radio monitoring task; repeat the above-mentioned satellite-ground linkage closed-loop feedback monitoring process until the monitoring is completed.

[0020] In the embodiment of the present invention, the specific processing methods of the coarse signal processing and the fine signal processing are specifically set according to actual needs. For example, the coarse signal processing includes Fourier transform and high-order statistics.

[0021] refer to Figure 1 Further, in an optional implementation of the embodiment of the present invention, the radio monitoring payload 1 includes: An L-band receiving phased array 11 is used to monitor and collect L-band signals; A Ka / Ku band receiving phased array 12, used for monitoring and collecting Ka band and Ku band signals; An XCS band antenna 13, used for monitoring and collecting signals of the X band, C band and S band; The signal comprehensive processing module 14 is respectively connected to the L-band receiving phased array 11, the Ka / Ku-band receiving phased array 12, the XCS-band antenna 13, the satellite computer on the low-orbit satellite and the communication payload on the low-orbit satellite, and is used to perform beam tracking of the radio system of the satellite to be monitored according to the received radio monitoring task, perform rough processing on the collected signals to obtain signal data including signal strength, signal frequency, bandwidth and modulation mode, send the signal data to the low-orbit satellite so that the low-orbit satellite adjusts its own position, adjusts the beam pointing of the L-band receiving phased array 11, adjusts the beam pointing of the Ka / Ku-band receiving phased array 12 and adjusts the beam pointing of the XCS-band antenna 13, and sends the signal data to the low-orbit satellite after time-space marking so that the low-orbit satellite sends the signal data to the ground station.

[0022] In the embodiment of the present invention, in order to realize the above functions of the signal integrated processing module 14, improve the integration of the radio monitoring payload 1, and reduce the area, power consumption, and cost of the radio monitoring payload 1, the signal integrated processing module 14 adopts an integrated structure of "FPGA+ARM". According to the functions required by the signal integrated processing module 14, the corresponding processing program is pre-loaded in the FPGA chip and ARM processor in the signal integrated processing module 14. When it is necessary to adjust the function of the signal integrated processing module 14, the corresponding program is designed on the ground side according to the required function, and the program data is uploaded to the communication payload of the low-orbit satellite, so that the communication payload sends the uploaded data to the signal integrated processing module 14, so as to perform online reconstruction of the program of the signal integrated processing module 14.

[0023] refer to Figure 1 Further, in an optional implementation of the embodiment of the present invention, the radio monitoring data processing module 2 is deployed on the cloud platform of the ground station, and is specifically constructed using the cloud platform of the ground station. The radio monitoring data processing module 2 includes: The mission planning unit 21 is used to generate a radio monitoring mission according to the operating orbit and beam coverage of the satellite radio system to be monitored and send it to the ground station so that the ground station can inject the radio monitoring mission to the low-orbit satellite; The radio monitoring processing unit 22 is connected to the task planning unit 21, and is used to perform fine processing on the received signal data, and to associate the signal data with the time and space information, so as to obtain the operating orbit, beam coverage and radio electromagnetic situation of the satellite radio system to be monitored, and send the obtained operating orbit and beam coverage of the satellite radio system to be monitored to the task planning unit 21 so that the task planning unit 21 updates the radio monitoring task.

[0024] By setting up the task planning unit 21 and the radio monitoring processing unit 22 to respectively carry out the planning of the radio monitoring task and the processing of the radio monitoring data, interference of different data can be avoided, the efficiency of task planning and data processing can be improved, and the efficiency of radio monitoring can be further improved.

[0025] refer to Figure 2 In a second aspect, an embodiment of the present invention further provides a satellite-to-ground linkage radio monitoring method based on a low-orbit satellite, the method using the above-mentioned satellite-to-ground linkage radio monitoring system based on a low-orbit satellite, the method comprising the following steps: Step 1, determining the orbit and beam coverage of the satellite radio system to be monitored, determining the theoretical orbit of the low-orbit satellite when performing the radio monitoring task according to the orbit and beam coverage of the satellite radio system to be monitored, generating a radio monitoring task including theoretical orbit information, the orbit and beam coverage of the satellite radio system to be monitored, and annotating it to the low-orbit satellite used to perform the radio monitoring task; Step 2, controlling the low-orbit satellite receiving the radio monitoring task to run to the theoretical operating orbit, using the radio monitoring payload 1 to monitor and collect signals in real time, and after collecting the signals, roughly processing the signals to obtain signal data including signal strength, signal frequency, bandwidth and modulation mode, and performing feedback adjustment of the low-orbit satellite position and the beam pointing of the radio monitoring payload 1 according to the obtained signal strength until the obtained signal strength reaches a maximum, and after completing the feedback adjustment of the low-orbit satellite position and the beam pointing of the radio monitoring payload 1, roughly processing the collected signals to obtain signal data including signal strength, signal frequency, bandwidth and modulation mode, and sending the obtained signal data to the low-orbit satellite after time-space marking so that the low-orbit satellite sends the signal data to the ground station; Step 3, using the radio monitoring data processing module 2 to perform precise processing on the received signal data, and to associate the signal data with the time and space information to obtain the orbit, beam coverage and radio electromagnetic situation of the satellite radio system to be monitored; Step 4, determine the theoretical orbit of the low-orbit satellite when performing the radio monitoring task based on the obtained orbit and beam coverage of the satellite radio system to be monitored, determine the low-orbit satellite used to perform the radio monitoring task based on the determined theoretical orbit and the actual orbits and fuel reserves of all low-orbit satellites deployed with radio monitoring payload 1 at the current moment, generate a radio monitoring task including theoretical orbit information, the orbit and beam coverage of the satellite radio system to be monitored, and annotate it to the determined low-orbit satellite used to perform the radio monitoring task.

[0026] It should be noted that the above step 1 is implemented on the ground station, the above step 2 is implemented on the low-orbit satellite, and the above steps 3 and 4 are implemented on the ground station. After executing step 4, the low-orbit satellite performs corresponding actions according to the radio monitoring task after receiving the radio monitoring task, specifically executing step 2, and then continuing to execute steps 3 and 4, and continuously looping the process until the monitoring is completed.

[0027] In an embodiment of the present invention, by adopting the above-mentioned method to perform radio monitoring, it is possible to fully integrate on-board processing capabilities and ground processing capabilities, realize satellite-ground linked radio monitoring, significantly improve the flexibility and efficiency of radio monitoring, and realize the monitoring of multiple frequency band signals including satellite radio system signals; and, by performing orbit planning and maneuvering of low-orbit satellites according to the actual operating orbit and beam coverage of the satellite radio system to be monitored, it is possible to reduce the energy consumption of low-orbit satellites, and make the low-orbit satellites within the downlink beam range of the satellite radio system to be monitored as much as possible, thereby extending the effective monitoring time of the low-orbit satellites and improving the amount of monitoring signal data and the monitoring accuracy.

[0028] Furthermore, in an embodiment of the present invention, the method further includes: The performance curve of the radio signal is drawn based on the precise processing results of the signal data, and the service performance of the satellite radio system to be monitored is checked to see if there are any problems.

[0029] The performance curve of the radio signal is drawn through the signal data processing results, and the service performance of the satellite radio system to be monitored is checked based on the signal data processing results and the performance curve to check whether there are any problems. When problems occur in the satellite radio system, they can be discovered in time to ensure the service stability and reliability of the satellite radio system.

[0030] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A satellite-to-ground radio monitoring system based on a low-orbit satellite, characterized in that: The system comprises: A radio monitoring payload is deployed on a low-orbit satellite and is used to perform beam tracking of a radio system of a satellite to be monitored according to a received radio monitoring task, monitor and collect signals of L-band, Ka-band, Ku-band, X-band, C-band and S-band, perform rough processing on the signals to obtain signal data including signal strength, signal frequency, bandwidth and modulation mode, send the signal data to the low-orbit satellite so that the low-orbit satellite adjusts its own position and the beam pointing direction of the radio monitoring payload, and perform time-space marking on the signal data and send it to the low-orbit satellite so that the low-orbit satellite sends the signal data to a ground station; The radio monitoring data processing module is deployed on the ground station and is used to generate a radio monitoring task according to the operating orbit and beam coverage of the satellite radio system to be monitored and send it to the ground station so that the ground station can inject the radio monitoring task to the low-orbit satellite, perform fine processing on the received signal data, and associate the signal data with time and space information to obtain the operating orbit, beam coverage and radio electromagnetic situation of the satellite radio system to be monitored, and update the radio monitoring task according to the obtained operating orbit and beam coverage of the satellite radio system to be monitored.

2. The low-orbit satellite-based satellite-to-ground linkage radio monitoring system according to claim 1, characterized in that: The radio monitoring payload includes: L-band receiving phased array, used to monitor and collect L-band signals; Ka / Ku-band receiving phased array, used to monitor and collect Ka-band and Ku-band signals; XCS band antenna, used to monitor and collect signals in X-band, C-band and S-band; The signal comprehensive processing module is respectively connected to the L-band receiving phased array, the Ka / Ku-band receiving phased array, the XCS-band antenna, the satellite computer on the low-orbit satellite and the communication payload on the low-orbit satellite, and is used to perform beam tracking of the radio system of the satellite to be monitored according to the received radio monitoring task, perform rough processing on the collected signal to obtain signal data including signal strength, signal frequency, bandwidth and modulation mode, send the signal data to the low-orbit satellite so that the low-orbit satellite adjusts its own position, adjusts the beam pointing of the L-band receiving phased array, adjusts the beam pointing of the Ka / Ku-band receiving phased array and adjusts the beam pointing of the XCS-band antenna, and sends the signal data to the low-orbit satellite after time-space marking so that the low-orbit satellite sends the signal data to the ground station.

3. The low-orbit satellite-based satellite-to-ground linkage radio monitoring system according to claim 1, characterized in that: The radio monitoring data processing module is deployed on the cloud platform of the ground station, and the radio monitoring data processing module includes: A task planning unit, used for generating a radio monitoring task according to the operating orbit and beam coverage of the satellite radio system to be monitored and sending the task to the ground station so that the ground station can inject the radio monitoring task to the low-orbit satellite; The radio monitoring processing unit is connected to the task planning unit, and is used to perform fine processing on the received signal data, and to perform correlation processing on the signal data and the time and space information, so as to obtain the operating orbit, beam coverage and radio electromagnetic situation of the satellite radio system to be monitored, and to send the obtained operating orbit and beam coverage of the satellite radio system to be monitored to the task planning unit so that the task planning unit updates the radio monitoring task.

4. A satellite-ground linkage radio monitoring method based on a low-orbit satellite, characterized in that: The method uses a satellite-ground linkage radio monitoring system based on a low-orbit satellite as described in any one of claims 1 to 3, and the method comprises: Determine the orbit and beam coverage of the satellite radio system to be monitored, determine the theoretical orbit of the low-orbit satellite when performing the radio monitoring task based on the orbit and beam coverage of the satellite radio system to be monitored, generate a radio monitoring task including theoretical orbit information, the orbit and beam coverage of the satellite radio system to be monitored, and annotate it to the low-orbit satellite used to perform the radio monitoring task; Controlling the low-orbit satellite receiving the radio monitoring task to move to the theoretical operating orbit, using the radio monitoring payload to monitor and collect signals in real time, roughly processing the signals after collecting them to obtain signal data including signal strength, signal frequency, bandwidth and modulation mode, performing feedback adjustment on the low-orbit satellite position and the radio monitoring payload beam pointing according to the obtained signal strength until the obtained signal strength reaches a maximum, after completing the feedback adjustment on the low-orbit satellite position and the radio monitoring payload beam pointing, roughly processing the collected signals to obtain signal data including signal strength, signal frequency, bandwidth and modulation mode, and sending the obtained signal data to the low-orbit satellite after time-space marking so that the low-orbit satellite sends the signal data to the ground station; The radio monitoring data processing module is used to precisely process the received signal data, and the signal data is correlated with the time and space information to obtain the orbit, beam coverage and radio electromagnetic situation of the satellite radio system to be monitored; The theoretical orbit of the low-orbit satellite when performing the radio monitoring task is determined based on the obtained orbit and beam coverage of the satellite radio system to be monitored. The low-orbit satellite used to perform the radio monitoring task is determined based on the determined theoretical orbit and the actual orbits and fuel inventories of all low-orbit satellites deployed with radio monitoring payloads at the current moment. A radio monitoring task including the theoretical orbit information, the orbit and beam coverage of the satellite radio system to be monitored is generated and uploaded to the determined low-orbit satellite used to perform the radio monitoring task.

5. The satellite-ground linkage radio monitoring method based on low-orbit satellite according to claim 4 is characterized in that: The method further comprises: The performance curve of the radio signal is drawn based on the precise processing results of the signal data, and the service performance of the satellite radio system to be monitored is checked to see if there are any problems.

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