Low-altitude aircraft safety management method and system based on low-orbit Beidou navigation enhanced satellite

Abstract

The invention discloses a low-altitude aircraft safety management method and system based on a low-orbit Beidou navigation enhanced satellite, and relates to the field of safety management of low-altitude aircrafts, the system comprises a zeroth module, an eleventh module, a twelfth module and a thirteenth module, the zeroth module is a satellite receiving and shunting module, the eleventh module is a satellite clock reference signal extraction module, the twelfth module is a satellite clock reference signal extraction module, and the thirteenth module is a satellite clock reference signal extraction module. The twelfth module is a local clock signal generation module, and the thirteenth module is a continuous cubic mean square error calculation module. The method is simple and easy to implement, the method is easy to implement, few aircraft computing resources are consumed, meanwhile, interference information is processed from the dimension of pseudo-random code frequency information, and interference influences of other frequencies are fundamentally eliminated; a shunt strategy and a self-feedback mechanism are adopted, and a serial method of firstly eliminating interference and then performing positioning is adopted, so that the interference monitoring and positioning precision of the whole flight path from multiple dimensions of airspace, time domain, frequency domain and the like is ensured, and the flight safety is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of safety management of low-altitude aircraft, and specifically to a safety management method and system for low-altitude aircraft that utilizes low-orbit Beidou navigation enhancement satellites to perform high-precision and accurate positioning and anti-interference. Background Art

[0002] The low-altitude economy is a comprehensive economic form that is driven by various low-altitude flight activities of various manned and unmanned aircraft, radiating and driving the integrated development of related fields. The main products in the low-altitude field include the highly-watched eVTOL (electric vertical take-off and landing aircraft), drones (consumer and industrial), helicopters, traditional fixed-wing aircraft, etc. From the perspective of application scenarios, the low-altitude economy can be divided into urban scenarios (urban air traffic) and non-urban scenarios (operational flights in remote areas of industry, agriculture, forestry, fisheries and construction, as well as flight activities in medical rescue, disaster relief, meteorological detection, ocean monitoring, scientific experiments, education and training, culture and sports). In 2024, the low-altitude economy has been included in the "Government Work Report" and has become an important driving engine for new quality productivity.

[0003] In the low-altitude economy, low-altitude aircraft such as drones carrying passengers and cargo face the safety risk of collision or cross-contact between routes when multiple aircraft are on the same route. It is necessary to effectively monitor and control the driving intervals between each aircraft. At the same time, low-altitude aircraft currently have poor anti-interference capabilities, and ground interference equipment can easily deceive or suppress the reference clock signal and navigation signal on the aircraft, interfere with the aircraft, and pose a major safety hazard.

[0004] Therefore, achieving high-precision positioning management, interference monitoring and anti-interference management of low-altitude aircraft is of great significance to the safe operation of low-altitude aircraft.

[0005] At present, some low-altitude aircraft in China are equipped with high-precision positioning management modules, but they are all based on ground-based base stations and CORS systems, which can make the positioning accuracy of aircraft reach 10cm. However, this system is easily affected by urban buildings, mountains and other structures, and has poor stability. In addition, the ground CORS system is mainly designed for use with ground high-precision positioning equipment, and the system signal has weak space propagation and radiation capabilities, which directly leads to poor results in the ground CORS system for low-altitude aircraft. At the same time, the interference monitoring and anti-interference capabilities of low-altitude aircraft are generally poor, and the overall cost of high-precision positioning and anti-interference equipment for low-altitude aircraft deployed based on ground CORS base stations is relatively high, which is not widely used in the low-altitude economic field. Therefore, it is urgent to design a low-altitude aircraft safety management method and system based on low-orbit Beidou navigation enhancement satellite to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a low-altitude aircraft safety management method and system based on low-orbit Beidou navigation augmentation satellite, so as to solve the problems raised in the above background technology that the interference monitoring and anti-interference capabilities of current low-altitude aircraft are generally poor, and the overall cost of high-precision positioning and anti-interference equipment for low-altitude aircraft deployed based on ground CORS base stations is relatively high, and it is not widely used in the low-altitude economic field for industrial promotion.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The low-altitude aircraft safety management system based on low-orbit Beidou navigation augmentation satellite includes module 0, module 11, module 12, module 13, module 14, module 15, module 16, module 17, module 18, module 21, module 22, module 23, module 24, module 25, module 26, module 27, module 28, module 29, module 291, module 292, module 31, module 32, module 33, module 34, module 35 and module 36, wherein the module 0 is a satellite receiving and branching module, the module 11 is a satellite clock reference signal extraction module, the module 12 is a local clock signal generation module, the module 13 is a continuous three-time mean square error calculation module, the module 14 is a subtle error storage module, the module 15 is a less than judgment module, the module 16 is a greater than judgment module, and the module 17 is a local Clock signal module, module 18 is the satellite clock signal module, module 21 is the pseudo-random signal extraction module, module 22 is the local pseudo-random signal generation module, module 23 is the correlation matching module, module 24 is the detection success judgment module, module 25 is the detection unsuccessful judgment module, module 26 is the normal indication module, module 27 is the interference alarm indication, module 28 is the start signal enhancement module, module 29 is the detection success judgment module, module 291 is the detection unsuccessful judgment module, no correlation peak appears, and the signal enhancement is continued, module 292 is the normal working indication module, module 31 is the low-orbit Beidou navigation enhanced positioning signal extraction module, module 32 is the normal working status monitoring module, module 33 is the normal working status monitoring module, module 34 is the abnormal working status monitoring module, module 35 is the multi-star positioning solution module, and module 36 is the positioning information determination module.

[0009] A low-altitude aircraft management method based on low-orbit Beidou navigation augmentation satellites: The management method is as follows: based on low-orbit Beidou navigation augmentation satellites, the time and frequency information of medium- and high-orbit Beidou navigation satellite signals is extracted, and the signals of multiple medium- and high-orbit Beidou satellites are further used for differentiation and error correction, and the corrected high-precision and high-reference signals are amplified and enhanced, and broadcast to low-altitude aircraft for reception. The broadcast information includes a high-precision and low-latency clock reference, pseudo-random coding information for anti-interference, and Beidou positioning time difference information after error correction. Further, under the calculation of the low-altitude aircraft navigation and positioning module and the anti-interference module, the high-precision position information is updated and the interference information is monitored and calibrated.

[0010] As a further solution of the present invention: the specific method steps are as follows: Step 1: First, according to the matching of the pseudo-random code of the low-orbit Beidou navigation satellite and the decoding unit of the low-altitude aircraft, the identity characteristics of the low-orbit Beidou navigation satellite are recognized. The pseudo-random code released by each low-orbit Beidou navigation satellite is different. In terms of the arrangement of the received signal, the pseudo-random signal is followed by a high-precision, low-latency clock reference and Beidou positioning time difference information after error correction;

[0011] Step 2: After the pseudo-random code information, the high-precision, low-latency clock reference and the error-corrected Beidou positioning time difference information are followed. The high-precision, low-latency clock reference information is used to compare with the local clock. If it is found to deviate from the clock reference, comprehensive correction is performed in time. The correction method uses three consecutive comparisons (t 11 ,t 12 ,t 13 ), if deviations are detected, the clock reference of the low-orbit Beidou navigation satellite received three times in a row is corrected (t 01 ,t 02 ,t 03 ) is the clock reference of the low-altitude aircraft, which can realize the anti-interference of the aircraft clock reference;

[0012] Step 3: During the pseudo-random code reception process in step 1, the receiving signal path is F1. If the pseudo-random code cannot be matched for three consecutive times, the gain amplification of the low-altitude aircraft receiving module is started, and an alarm is sent to the control system. The alarm information indicates that the interference information is suppressed or deceptive. The signal is continuously amplified until the match is successful, then the signal amplification is terminated and the existing signal power is maintained. At the same time, the control system is sent a signal that the aircraft is continuously being interfered with, and the signal is branched F2. The branched signal is matched with the received pseudo-random code. If the match is successful, it means that the interference is over. The signal ends amplification, returns to the normal power level, and the alarm is lifted;

[0013] Step 4: In the Beidou positioning time difference information after error correction in step 1, according to the number of satellite signals received by the aircraft, the low-altitude aircraft positioning solution module performs Beidou positioning information solution and redundant calculation according to the triangulation positioning algorithm to achieve high-precision position calculation and information output.

[0014] As a further solution of the present invention: the low-altitude aircraft uses the low-orbit Beidou navigation enhancement satellite to monitor the signal anti-interference information, which is based on the matching of pseudo-random code information. A successful match indicates that the signal is not interfered with or suppressed; an unsuccessful match indicates that the signal is interfered with or suppressed.

[0015] As a further solution of the present invention: the low-altitude aircraft uses the low-orbit Beidou navigation enhancement satellite to monitor the clock reference anti-interference information and perform continuous deviation monitoring. If continuous clock deviation occurs, it means that the clock reference is interfered with. The correct clock information is corrected based on the clock transmitted by the low-orbit satellite.

[0016] As a further solution of the present invention: the low-altitude aircraft uses low-orbit Beidou navigation enhancement satellites to perform high-precision precise positioning and anti-interference safety management system, characterized in that: the low-altitude aircraft uses low-orbit Beidou navigation enhancement satellites to monitor signal anti-interference information, and needs to adopt a self-feedback mechanism for recovery, using a branch function, one path is amplified and enhanced to achieve normal operation; one path is branched to achieve signal interference monitoring. If the two paths are matched successfully at the same time, it means that the interference is lifted and the signal returns to a single-path working state. Once the interference alarm is triggered, the branch working state is started.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention solves positioning information and extracts relevant information while ensuring that the clock reference and signal are normal, which can better avoid the relevant collision risks and deception risks that may be caused by positioning errors;

[0019] 2. The present invention gives full play to the advantages of low-orbit Beidou navigation satellites in high-precision positioning signal broadcasting, low-latency space-time reference transmission, and anti-interference pseudo-random code matching. Through the efficient anti-interference analysis method of the aircraft, the high-precision positioning and rapid anti-interference monitoring of low-altitude aircraft are realized with high reliability. At the same time, the interference suppression is realized through the self-feedback mechanism, ensuring that it can still work normally in the case of third-party interference;

[0020] 3. The present invention is simple and easy to implement, the method is simple to implement, and consumes less computing resources of the aircraft. At the same time, the interference information is processed from the dimension of pseudo-random code frequency information, which fundamentally eliminates the influence of other frequency interference; it adopts a branching strategy and a self-feedback mechanism, and eliminates the interference first and then performs a serial method of positioning, thereby ensuring the interference monitoring and positioning accuracy of the entire flight path from multiple dimensions such as airspace, time domain and frequency domain, thereby greatly improving the safety of the flight. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a module diagram of the low-altitude aircraft safety management system based on the low-orbit Beidou navigation augmentation satellite. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0023] See also Figure 1 In an embodiment of the present invention, a low-altitude aircraft safety management method and system based on a low-orbit Beidou navigation augmentation satellite includes a 0th module, an 11th module, a 12th module, a 13th module, a 14th module, a 15th module, a 16th module, a 17th module, an 18th module, a 21st module, a 22nd module, a 23rd module, a 24th module, a 25th module, a 26th module, a 27th module, a 28th module, a 29th module, a 291st module, a 292nd module, a 31st module, a 32nd module, a 33rd module, a 34th module, a 35th module and a 36th module, wherein the 0th module is a satellite receiving and branching module, which implements the low-orbit Beidou navigation augmentation satellite. The receiving and branching function of the navigation enhanced satellite signal is to identify and confirm the satellite signal after receiving it, and respectively extract the clock reference signal, pseudo-random signal and positioning signal contained in the satellite signal. The 11th module is a satellite clock reference signal extraction module, which realizes the extraction of the satellite clock reference signal. The subsequent modules will perform corresponding processing and analysis on the signal. The 12th module is a local clock signal generation module, which generates a local clock signal by a local clock crystal oscillator. The 13th module is a continuous three-time mean square error calculation module, which compares the local clock signal with the satellite clock signal, and selects whether to continue to use the local clock signal according to the comparison result;

[0024] The 14th module is a microsecond error storage module, which determines the specific error value of the microsecond bit according to the accuracy of the local clock. The 15th module is a less than judgment module. If the microsecond error is less than the value, enter the next module. The 16th module is a greater than judgment module. If the microsecond error is greater than the value, enter the next module. The 17th module is a module for using a local clock signal. If the microsecond error is less than the value, the local clock signal is used as the positioning reference signal. The 18th module is a module for using a satellite clock signal. If the microsecond error is greater than the value, the satellite clock signal is used as the positioning reference signal. The 21st module is a pseudo-random signal extraction module, which extracts the pseudo-random signal from the satellite signal. The 22nd module is a local pseudo-random signal generation module, which generates a local pseudo-random signal that matches the satellite pseudo-random signal. The 23rd module is a correlation matching module, which performs correlation matching between the local pseudo-random signal and the satellite pseudo-random signal, and enters the next module if the match is successful or not (the successful mark is the generation of a correlation peak).

[0025] The 24th module is a detection success judgment module, and the successful identification is the generation of a correlation peak, and the next module is entered. The 25th module is a detection failure judgment module, and no correlation peak appears, and the next module is entered. The 26th module is a normal indication module. According to the correlation matching result of the 24th module, a correlation peak is generated, which is a normal indication, that is, interference or obvious interference occurs. The 27th module is an interference alarm indication. According to the correlation matching result of the 25th module, no correlation peak is generated, and an alarm interference indication is issued, that is, obvious interference occurs. The 28th module is a start signal enhancement module. In the case of interference, the received signal is continuously amplified until the correlation matching is successful. The 29th module is a detection success judgment module, and the successful identification is the generation of a correlation peak, and the next module is entered. The 291st module is an unsuccessful detection judgment module, and no correlation peak appears, and the signal enhancement is continuously performed. The 292nd module is a normal working indication module According to the detection result of the 29th module, signal matching is performed and a normal working indication is given, but it is expressed as a normal working indication under signal enhancement. The 31st module is a low-orbit Beidou navigation enhanced positioning signal extraction module, which extracts the Beidou navigation enhanced positioning signal used for positioning from the received satellite signal. The 32nd module is a normal working status monitoring module, which is the signal access of the 26th module and the 292th module. If any of the two modules is displayed normal, they will enter the next working module. The 33rd module is a normal working status monitoring module, which enters the multi-star solution module under normal working status. The 34th module is an abnormal working status monitoring module. If the working status is abnormal, it will enter the autonomous positioning module. The 35th module is a multi-star positioning solution module, which uses multi-star positioning to solve the position information and obtain the position information. The 36th module is a positioning information determination module. After obtaining the position information, the position information is stored and updated.

[0026] After the satellite clock reference signal is extracted, the mean square error is calculated three times in a row with the reference clock generated by the local clock generation module. If it is greater than the set error, the satellite clock signal is used as the reference clock. If it is less than the set error, the local clock signal is used as the reference clock. After the pseudo-random signal is extracted, it is matched with the locally generated pseudo-random signal for correlation. If the correlation peak can be obtained, it indicates that the operation is normal and there is no interference. If the correlation peak is not obtained, an interference alarm is issued and signal enhancement is started at the same time until the match is successful. In this case, normal operation means normal operation under signal enhancement. At this time, the solution and processing of low-orbit navigation enhanced satellite positioning information can be performed, including multi-star positioning solution and storage and update of positioning information. If the working status is abnormal, passive autonomous positioning is started;

[0027] Based on the low-orbit Beidou navigation augmentation satellite, the time and frequency information of the medium-orbit Beidou navigation satellite signal is extracted, and the signals of multiple medium-orbit Beidou satellites are used for differentiation and error correction. The corrected high-precision and high-reference signal is amplified and enhanced, and broadcast to the low-altitude aircraft for reception. The broadcast information contains a high-precision and low-latency clock reference, pseudo-random coding information for anti-interference, and Beidou positioning time difference information after error correction. Further, under the calculation of the low-altitude aircraft navigation and positioning module and the anti-interference module, the high-precision position information is updated and the interference information is monitored and calibrated. The specific steps are as follows:

[0028] Step 1: First, the identification characteristics of the low-orbit Beidou navigation satellite are identified by matching the pseudo-random code of the low-orbit Beidou navigation satellite with the decoding unit of the low-altitude aircraft. The pseudo-random code released by each low-orbit Beidou navigation satellite is different. In terms of receiving signal arrangement, the pseudo-random signal is followed by a high-precision, low-latency clock reference and error-corrected Beidou positioning time difference information;

[0029] Step 2: After the pseudo-random code information, the high-precision, low-latency clock reference and the error-corrected Beidou positioning time difference information are followed. The high-precision, low-latency clock reference information is used to compare with the local clock. If it is found to deviate from the clock reference, comprehensive correction is performed in time. The correction method uses three consecutive comparisons (t 11 ,t 12 ,t 13 ), if deviations are detected, the clock reference of the low-orbit Beidou navigation satellite received three times in a row is corrected (t 01 ,t 02 ,t 03 ) is the clock reference of the low-altitude aircraft, which can realize the anti-interference of the aircraft clock reference;

[0030] Step 3: During the pseudo-random code reception process in step 1, the receiving signal path is F1. If the pseudo-random code cannot be matched for three consecutive times, the gain amplification of the low-altitude aircraft receiving module is started, and an alarm is sent to the control system. The alarm information indicates that the interference information is suppressed or deceptive. The signal is continuously amplified until the match is successful, then the signal amplification is terminated and the existing signal power is maintained. At the same time, the control system is sent a signal that the aircraft is continuously being interfered with, and the signal is branched F2. The branched signal is matched with the received pseudo-random code. If the match is successful, it means that the interference is over. The signal ends amplification, returns to the normal power level, and the alarm is lifted;

[0031] Step 4: In the Beidou positioning time difference information after error correction in step 1, according to the number of satellite signals received by the aircraft, the low-altitude aircraft positioning solution module performs Beidou positioning information solution and redundant calculation according to the triangulation positioning algorithm to achieve high-precision position calculation and information output;

[0032] Low-altitude aircraft use low-orbit Beidou navigation enhancement satellites to monitor signal anti-interference information. This is based on matching pseudo-random code information. A successful match indicates that the signal has not been interfered with or suppressed; an unsuccessful match indicates that the signal has been interfered with or suppressed.

[0033] Low-altitude aircraft use low-orbit Beidou navigation enhancement satellites to monitor clock reference anti-interference information and conduct continuous deviation monitoring. If continuous clock deviation occurs, it means that the clock reference is interfered with. The correct clock information is corrected based on the clock transmitted by the low-orbit satellite;

[0034] The low-altitude aircraft uses low-orbit Beidou navigation enhancement satellites to perform high-precision and accurate positioning and anti-interference safety management system, which is characterized by: the low-altitude aircraft uses low-orbit Beidou navigation enhancement satellites to monitor signal anti-interference information, and needs to adopt a self-feedback mechanism for recovery, using a branch function, one path is amplified and enhanced to achieve normal operation; one path is branched to achieve signal interference monitoring. If both paths are matched successfully at the same time, it means that the interference is lifted and the signal returns to a single-path working state. Once the interference alarm is triggered, the branch working state is started;

[0035] The present invention is aimed at three key links involving flight safety of low-altitude aircraft during flight, including interference of clock reference, interference of aircraft frequency signal, and high-precision positioning of aircraft. First, the interference monitoring of aircraft frequency signal (i.e., normal working signal) is carried out, which is the basis. As long as the operation is normal, the clock reference interference monitoring is carried out. If the operation is not normal, the signal amplification is continuously started to ensure that the clock reference interference is monitored and corrected under normal operation. The monitoring of clock reference interference and the interference monitoring of working signal both adopt multiple measurement methods to prevent false detection, which further ensures the accuracy of interference monitoring. Then, for the interference monitoring and suppression of working signal, the method of shunt self-feedback is adopted, which can ensure the normal operation of aircraft on the one hand, and can realize interference disappearance monitoring through continuous feedback on the other hand, and the two-way mechanism can more safely protect the normal driving of aircraft. Then, under the condition of ensuring that the clock reference and signal are normal, the positioning information is solved and the relevant information is extracted, so that the relevant collision risk and deception risk that may be caused by positioning error can be better avoided.

[0036] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-altitude aircraft safety management system based on a low-orbit Beidou navigation augmentation satellite, comprising module 0, module 11, module 12, module 13, module 14, module 15, module 16, module 17, module 18, module 21, module 22, module 23, module 24, module 25, module 26, module 27, module 28, module 29, module 291, module 292, module 31, module 32, module 33, module 34, module 35 and module 36, characterized in that: The 0th module is a satellite receiving and branching module, the 11th module is a satellite clock reference signal extraction module, the 12th module is a local clock signal generation module, the 13th module is a three-time continuous mean square error calculation module, the 14th module is a subtle error storage module, the 15th module is a less than judgment module, the 16th module is a greater than judgment module, the 17th module is a local clock signal using module, the 18th module is a satellite clock signal using module, the 21st module is a pseudo-random signal extraction module, the 22nd module is a local pseudo-random signal generation module, the 23rd module is a correlation matching module, the 24th module is a detection success judgment module, and the 25th module is a The first module is the detection failure judgment module, the 26th module is the normal indication module, the 27th module is the interference alarm indication, the 28th module is the start signal enhancement module, the 29th module is the detection success judgment module, the 291st module is the detection failure judgment module, no correlation peak appears, and the signal enhancement is continued, the 292nd module is the normal working indication module, the 31st module is the low-orbit Beidou navigation enhanced positioning signal extraction module, the 32nd module is the normal working status monitoring module, the 33rd module is the normal working status monitoring module, the 34th module is the abnormal working status monitoring module, the 35th module is the multi-star positioning solution module, and the 36th module is the positioning information determination module.

2. The low-altitude aircraft safety management method based on low-orbit Beidou navigation augmentation satellite according to claim 1 is characterized in that: The management method is as follows: based on the low-orbit Beidou navigation augmentation satellite, the time and frequency information of the medium-orbit Beidou navigation satellite signals is extracted, and the signals of multiple medium-orbit Beidou satellites are further used for differentiation and error correction. The corrected high-precision and high-reference signals are amplified and enhanced, and broadcast to low-altitude aircraft for reception. The broadcast information includes a high-precision and low-latency clock reference, pseudo-random coding information for anti-interference, and Beidou positioning time difference information after error correction. Further, under the calculation of the low-altitude aircraft navigation and positioning module and the anti-interference module, the high-precision position information is updated and the interference information is monitored and calibrated.

3. The low-altitude aircraft safety management method based on low-orbit Beidou navigation augmentation satellite according to claim 2 is characterized in that: The specific method steps are as follows: Step 1: First, according to the matching of the pseudo-random code of the low-orbit Beidou navigation satellite and the decoding unit of the low-altitude aircraft, the identity characteristics of the low-orbit Beidou navigation satellite are recognized. The pseudo-random code released by each low-orbit Beidou navigation satellite is different. In terms of the arrangement of the received signal, the pseudo-random signal is followed by a high-precision, low-latency clock reference and the Beidou positioning time difference information after error correction; Step 2: After the pseudo-random code information, the high-precision, low-latency clock reference and the error-corrected Beidou positioning time difference information are followed. The high-precision, low-latency clock reference information is used to compare with the local clock. If it is found to deviate from the clock reference, comprehensive correction is performed in time. The correction method uses three consecutive comparisons (t 11 ,t 12 ,t 13 ), if deviations are detected, the clock reference of the low-orbit Beidou navigation satellite received three times in a row is corrected (t 01 ,t 02 ,t 03 ) is the clock reference of the low-altitude aircraft, which can realize the anti-interference of the aircraft clock reference; Step 3: During the pseudo-random code reception process in step 1, the receiving signal path is F1. If the pseudo-random code cannot be matched for three consecutive times, the gain amplification of the low-altitude aircraft receiving module is started, and an alarm is sent to the control system. The alarm information indicates that the interference information is suppressed or deceptive. The signal is continuously amplified until the match is successful, then the signal amplification is terminated and the existing signal power is maintained. At the same time, the control system is sent that the aircraft is continuously being interfered, and the signal is split F2. The split signal is matched with the received pseudo-random code. If the match is successful, it means that the interference is over, the signal is over, the amplification is returned to the normal power level, and the alarm is lifted; Step 4: In the Beidou positioning time difference information after error correction in step 1, according to the number of satellite signals received by the aircraft, the low-altitude aircraft positioning solution module performs Beidou positioning information solution and redundant calculation according to the triangulation positioning algorithm to achieve high-precision position calculation and information output.

4. The low-altitude aircraft safety management method based on low-orbit Beidou navigation enhancement satellite according to claim 3 is characterized in that: The low-altitude aircraft uses the low-orbit Beidou navigation enhancement satellite to monitor the signal anti-interference information, which is based on the matching of pseudo-random code information. A successful match indicates that the signal is not interfered with or suppressed; an unsuccessful match indicates that the signal is interfered with or suppressed.

5. The low-altitude aircraft safety management method based on low-orbit Beidou navigation augmentation satellite according to claim 3 is characterized in that: The low-altitude aircraft uses the low-orbit Beidou navigation enhancement satellite to monitor the clock reference anti-interference information and perform continuous deviation monitoring. If continuous clock deviation occurs, it means that the clock reference is interfered with. The correct clock information is corrected based on the clock transmitted by the low-orbit satellite.

6. The low-altitude aircraft safety management method based on low-orbit Beidou navigation augmentation satellite according to claim 3 is characterized in that: The low-altitude aircraft uses low-orbit Beidou navigation enhancement satellites to perform high-precision and accurate positioning and anti-interference safety management system, which is characterized by: the low-altitude aircraft uses low-orbit Beidou navigation enhancement satellites to monitor signal anti-interference information, and needs to adopt a self-feedback mechanism for recovery. A branch function is adopted, and one path is amplified and enhanced to achieve normal operation; one path is branched to achieve signal interference monitoring. If the two paths are matched successfully at the same time, it means that the interference is lifted and the signal is restored to a single-path working state. Once the interference alarm is triggered, the branch working state is started.

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