A method for transmitting positioning information from a BeiDou positioning base station that resists interference

Abstract

This invention relates to the field of satellite communication technology, and in particular to a method for transmitting positioning information using an anti-interference BeiDou positioning base station. The method involves acquiring signals transmitted by the user terminal through the anti-interference base station and transmitting them to the master control station. The master control station then transmits the signals to the BeiDou satellite for processing to obtain navigation messages. These navigation messages are then sent to the user terminal via the master control station and the anti-interference base station. The user terminal performs positioning calculations based on the satellite signals to achieve real-time location updates. During transmission, the master control station calculates the bit error rate (BER) in the BeiDou satellite's navigation message generation process. Based on the BER, it determines whether the transmission process conforms to standards. Furthermore, based on this determination, it further assesses the transmission process in conjunction with data integrity, or identifies the reasons for non-compliance based on the BER and generates corresponding instructions. These instructions are used to adjust relevant parameters, thereby reducing the BER, improving the accuracy of navigation message generation, and ultimately increasing information transmission efficiency. This provides positioning support for operational equipment, inspection personnel, and other similar applications.

Description

Technical Field

[0001] This invention relates to the field of satellite communication technology, and in particular to a method for transmitting positioning information from a BeiDou positioning base station that is resistant to interference. Background Technology

[0002] Chinese patent application publication number CN119001776A discloses a multifunctional BeiDou communication terminal and its method. The terminal includes a BeiDou positioning module, a communication module, a data processing module, a human-computer interaction module, a power management module, an environmental perception module, a security encryption module, and an expansion interface module. By fusing system signals from these modules, positioning accuracy and reliability are improved, reducing positioning errors in complex environments. Furthermore, channel coding techniques such as low-density parity-check codes enhance data anti-interference capabilities during transmission, reducing the bit error rate. Compression algorithms such as discrete cosine transform are also used to reduce data volume for transmitting large amounts of data. However, this technical solution only addresses how to enhance anti-interference capabilities and reduce the bit error rate through channel coding techniques. Existing technologies suffer from a problem: the lack of a verification process during transmission prevents self-adjustment, resulting in low information transmission efficiency. Summary of the Invention

[0003] Therefore, the present invention provides a method for transmitting positioning information of an anti-interference BeiDou positioning base station, in order to solve the problem of low positioning information transmission efficiency of existing anti-interference BeiDou base stations during signal transmission.

[0004] To achieve the above objectives, the present invention provides a method for transmitting positioning information from an anti-interference BeiDou positioning base station, comprising:

[0005] The user terminal generates and transmits a radio frequency signal containing the raw data.

[0006] The radio frequency signal is obtained by an anti-interference base station and preprocessed to obtain several data packets, which are then transmitted and received by the main control station.

[0007] The system acquires several data packets transmitted by the main control station via BeiDou satellites, processes them to obtain navigation messages, and then sends the navigation messages to the corresponding anti-interference base stations via the main control station.

[0008] The main control station obtains the bit error rate and data integrity of each data packet generated during the process of the BeiDou satellite generating the navigation message.

[0009] The error rate is used to determine whether the transmission process of the positioning information conforms to the standard, and the determination result is combined with the data integrity to determine whether the transmission process conforms to the standard.

[0010] The bit error rate is periodically detected, and a judgment is made based on the comparison result between the bit error rate and the preset bit error rate. Based on the judgment result and the data integrity corresponding to each data packet, a judgment is made on whether the transmission process meets the standard.

[0011] When it is determined that the transmission process does not meet the standard, the reason for non-compliance is determined based on the difference between the bit error rate and the preset bit error rate.

[0012] Based on the aforementioned reasons, corresponding instructions are generated, which may be to determine the proportion of low-orbit satellites in the BeiDou satellites, or the transmission power of the anti-interference base station, or the sensitivity threshold of the anti-interference base station, or the filtering in the preprocessing process.

[0013] Adjust the quantity ratio, the transmission power, the sensitivity threshold, or the filtering based on the instructions.

[0014] Furthermore, the process of determining whether the transmission process conforms to the standard based on the data integrity corresponding to each data packet includes:

[0015] Obtain the completeness of each of the aforementioned data to determine the average completeness;

[0016] Based on the comparison results between the average integrity and the critical average integrity, it is determined whether to adjust the proportion of low-orbit satellites in the BeiDou satellite system.

[0017] Furthermore, the process of adjusting the proportion of low-orbit satellites in the BeiDou satellite system includes:

[0018] When the average completeness is determined to be less than or equal to the critical average completeness, the quantity ratio is adjusted accordingly.

[0019] Calculate the difference between the critical average completeness and the average completeness and record it as the completeness difference;

[0020] Based on the comparison result between the integrity difference and the preset integrity difference, a corresponding instruction is generated to determine to increase the quantity ratio. The increase in the quantity ratio is positively correlated with the integrity difference.

[0021] The quantity ratio is the ratio of the number of low-orbit satellites to the total number of BeiDou satellites used in conjunction with the anti-interference base station.

[0022] Furthermore, the process of determining the reason for non-compliance with the standard based on the difference between the bit error rate and the preset bit error rate includes:

[0023] Calculate the difference between the bit error rate and the preset bit error rate and record it as the bit rate difference;

[0024] The reason for non-compliance with the standard is determined based on the comparison result between the bit rate difference and the critical bit rate difference;

[0025] Based on the aforementioned reasons, the corresponding processing is determined according to the transmit / receive strength ratio or according to the code rate variance.

[0026] The transmit / receive strength ratio is the ratio of the strength of the received signal to the strength of the transmitted signal at the anti-interference base station, and the code rate variance is determined by variance calculation based on the historical bit error rates obtained from several periodic detections.

[0027] Furthermore, when determining that the code rate difference is less than or equal to the critical code rate difference, the process of determining the corresponding processing based on the transmit / receive strength ratio includes:

[0028] Based on the comparison between the transmit / receive strength ratio and the critical transmit / receive strength ratio, it is determined whether to increase the transmit power of the anti-interference base station or decrease the sensitivity threshold of the anti-interference base station.

[0029] Furthermore, when it is determined that the transmit / receive strength ratio is less than or equal to the critical transmit / receive strength ratio, it is determined to increase the transmit power;

[0030] Calculate the difference between the critical transmit / receive strength ratio and the transmit / receive strength ratio, and record it as the strength ratio difference;

[0031] Based on the comparison result between the intensity ratio difference and the preset intensity ratio difference, a corresponding instruction is generated to increase the transmission power. The increase in transmission power is positively correlated with the intensity ratio difference.

[0032] Furthermore, when it is determined that the transmit / receive strength ratio is greater than the critical transmit / receive strength ratio, the sensitivity threshold is reduced.

[0033] The signal-to-noise ratio (SNR) of the anti-interference base station is obtained, and a corresponding instruction is generated based on the comparison result between the SNR and the preset SNR to reduce the sensitivity threshold. The reduction in the sensitivity threshold is negatively correlated with the SNR.

[0034] Furthermore, when it is determined that the bitrate difference is greater than the critical bitrate difference, the process of determining the corresponding processing based on the bitrate variance includes:

[0035] Based on the comparison result between the bit rate variance and the critical bit rate variance, it is determined whether to add the filtering in the preprocessing process.

[0036] Furthermore, when it is determined that the bit rate variance is greater than the critical bit rate variance, the filtering is increased.

[0037] The signal-to-noise ratio (SNR) of the anti-interference base station is obtained, and a corresponding instruction is generated based on the comparison result between the SNR and the preset SNR to increase the filtering. The increase in filtering is negatively correlated with the SNR.

[0038] Compared with existing technologies, the location information transmission method of the anti-interference BeiDou positioning base station of the present invention has the following advantages: This method obtains the signal transmitted by the user terminal through the anti-interference base station and transmits it to the master control station. The master control station then transmits the signal to the BeiDou satellite for processing to obtain navigation messages. The navigation messages are then sent to the user terminal through the master control station and the anti-interference base station. The user terminal performs positioning calculations in conjunction with the satellite signals to achieve real-time location updates. During the transmission process, the master control station counts the bit error rate in the process of generating navigation messages by the BeiDou satellite. Based on the bit error rate, it determines whether the transmission process meets the standards. Based on the determination, it further judges the transmission process in conjunction with the data integrity. If the standard is not met, it determines the reason for non-compliance based on the bit error rate and generates corresponding instructions. Based on the instructions, it adjusts the quantity ratio, transmission power, sensitivity threshold, or filtering to reduce the bit error rate and improve the accuracy of navigation message generation. This improves the location information transmission efficiency of the anti-interference BeiDou base station during signal transmission, thereby providing stable positioning support for operating equipment, inspection personnel, etc. in special environments.

[0039] Furthermore, the present invention is also used to determine whether the transmission process conforms to the standard based on the comparison between the bit error rate and the preset bit error rate, and further combined with the data integrity in each data packet. When it is determined that the transmission process does not conform to the standard, the reason for non-compliance can be determined based on the difference between the bit error rate and the preset bit error rate, thereby reducing the bit error rate in a targeted manner and improving the transmission efficiency of positioning information during the transmission process.

[0040] Furthermore, the present invention can also determine the increase in the number of low-orbit satellites in the BeiDou satellite system when adjusting the proportion of low-orbit satellites based on the comparison result of the average integrity and the critical average integrity. This is achieved by determining the increase in the proportion of low-orbit satellites based on the comparison result of the integrity difference and the preset integrity difference, so as to achieve precise adjustment of the proportion of low-orbit satellites and improve the transmission efficiency of positioning information.

[0041] Furthermore, the present invention can also determine the reasons for non-compliance with the standard based on the comparison results of the bit error rate difference and the critical bit error rate difference. Based on the reasons, corresponding processing can be determined according to the transmit / receive strength ratio or the code rate variance, thereby improving the transmission process and thus improving the transmission efficiency of positioning information.

[0042] Furthermore, the present invention can also determine whether to increase the transmission power or decrease the sensitivity threshold based on the comparison result of the transmit / receive strength ratio and the preset transmit / receive strength ratio when the bit error rate difference is less than or equal to the critical bit error rate difference, thereby reducing the bit error rate and improving the transmission efficiency of positioning information.

[0043] Furthermore, the present invention can also determine to increase filtering based on the comparison result of the signal-to-noise ratio and the preset signal-to-noise ratio when the difference in bit error rate is greater than the critical difference in bit error rate, thereby reducing the bit error rate and improving the transmission efficiency of positioning information. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the positioning information transmission system of the anti-interference Beidou positioning base station in this invention.

[0045] Figure 2 This is a flowchart illustrating the positioning information transmission method of the anti-interference BeiDou positioning base station in this invention.

[0046] Figure 3 This is a logic diagram for determining whether the transmission process of positioning information based on bit error rate conforms to the standard and the corresponding processing in this invention.

[0047] Figure 4 This is a logic diagram illustrating why the transmission process for determining location information based on bit error rate difference in this invention does not conform to the standard and the corresponding processing logic. Detailed Implementation

[0048] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0049] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0050] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] Please see Figure 1 As shown, it is a schematic diagram of the positioning information transmission system of the anti-interference Beidou positioning base station in this embodiment.

[0052] The system includes a user terminal, an anti-interference base station, a master control station, a BeiDou satellite, an analysis module, and a control module. The user terminal transmits radio frequency signals containing raw data. The anti-interference base station, connected to the user terminal, acquires the radio frequency signals and preprocesses them to obtain several data packets. The master control station, connected to the anti-interference base station, acquires several of the data packets. The BeiDou satellite, connected to the master control station, acquires and processes the data packets to obtain navigation messages, and also transmits the navigation messages to the user terminal based on the master control station and the anti-interference base station. The analysis module, connected to the master control station, acquires the bit error rate and the data integrity of each data packet, determines whether the transmission process of positioning information conforms to standards based on the bit error rate, and determines whether the transmission process conforms to standards based on the determination result combined with data integrity, and periodically checks... The bit error rate is measured, and a judgment is made based on the comparison result between the bit error rate and the preset bit error rate. Based on the judgment result and the data integrity corresponding to each data packet, a judgment is made on whether the transmission process meets the standard. When the transmission process is determined to be non-compliant, the reason for non-compliance is determined based on the difference between the bit error rate and the preset bit error rate. Based on the reason, a corresponding instruction is generated. The instruction may be to determine the proportion of low-orbit satellites in the BeiDou satellite system, or the transmission power of the anti-interference base station, or the sensitivity threshold of the anti-interference base station, or the filtering in the preprocessing process. The control module is connected to the analysis module, the anti-interference base station, and the BeiDou satellite respectively, and is used to adjust the proportion of low-orbit satellites, the transmission power, or the sensitivity threshold, or the filtering based on the instruction.

[0053] Please see Figure 2 The diagram shown is a flowchart illustrating the positioning information transmission method of the anti-interference BeiDou positioning base station in this embodiment. The process includes at least the following steps:

[0054] S1: Generate and transmit an RF signal containing the raw data through the user terminal;

[0055] S2: Obtain radio frequency signals through anti-interference base stations and perform preprocessing to obtain several data packets, then transmit the several data packets and receive them through the main control station;

[0056] S3: Obtain several data packets transmitted by the main control station through the Beidou satellite and process them to obtain navigation messages, and then send the navigation messages to the corresponding anti-interference base station through the main control station;

[0057] S4; Obtain the bit error rate and data integrity of each data packet generated during the process of Beidou satellite generating navigation messages through the main control station;

[0058] S5: Determine whether the transmission process of location information complies with the standard based on the bit error rate, and determine whether the transmission process complies with the standard based on the determination result and data integrity.

[0059] S6: Periodically detect the bit error rate, make a judgment based on the comparison result of the bit error rate and the preset bit error rate, and make a judgment on whether the transmission process conforms to the standard based on the judgment result and the data integrity of each data packet.

[0060] S7: When it is determined that the transmission process does not meet the standard, the reason for non-compliance is determined based on the difference between the bit error rate and the preset bit error rate;

[0061] S8: Generate corresponding instructions based on the cause. The instructions are to determine the proportion of low-orbit satellites in the Beidou satellite system, or the transmission power of the anti-interference base station, or the sensitivity threshold of the anti-interference base station, or the filtering in the preprocessing process.

[0062] S9: Adjust the quantity ratio, transmission power, sensitivity threshold, or filtering based on the command.

[0063] Please see Figure 3 As shown, it is a logic diagram for determining whether the transmission process of positioning information conforms to the standard and the corresponding processing based on the bit error rate in this embodiment.

[0064] Specifically, in this embodiment, historical data collected in the past is analyzed, and corresponding preset or critical parameter values ​​are determined by combining statistical methods and application scenarios. To more accurately determine the transmission process of location information and refine the corresponding parameters during transmission, the preset bit error rate B0 can be divided into a first preset bit error rate B1 and a second preset bit error rate B2. For scenarios where the anti-interference base station is used for location information transmission within tunnels, B1 is set to 1.2 × 10⁻⁶. -5 B2 = 1.5 × 10 -5 The comparison process based on the bit error rate B with B1 and B2 is as follows:

[0065] If B is less than or equal to B1, the detected bit error rate is within the acceptable bit error rate threshold range, and the transmission process of the location information can be directly determined to be compliant with the standard. If B is greater than B1 and less than or equal to B2, further judgment is made based on the comparison of B with B1 and B2, combined with the data integrity in each data packet, to avoid relying on a single indicator and improve the accuracy of the judgment process. If B is greater than B2, the bit error rate generated during the current transmission process far exceeds the acceptable bit error rate threshold range. Therefore, the transmission process can be directly determined to be non-compliant with the standard. In this case, the cause can be determined by the difference between B and B0, and more specifically by the difference between B and B2.

[0066] Furthermore, the process of determining whether the transmission process conforms to the standard based on the data integrity corresponding to each data packet includes: obtaining the data integrity of each data packet to determine the average integrity; and determining whether to adjust the proportion of low-orbit satellites in the BeiDou satellites based on the comparison result between the average integrity and the critical average integrity.

[0067] Specifically, in this embodiment, the average integrity score F is obtained based on the data integrity score of each data packet. The critical average integrity score F0 = 99.97% is determined according to the standards in the BeiDou satellite communication process. The comparison process between F and F0 is as follows: If F is less than or equal to F0, it indicates that the data integrity score in the current transmission process does not meet the standard, and data in the data packets has been missing during transmission. Therefore, the transmission process needs to be optimized to improve the integrity score of the data packets. This is achieved by increasing the number of BeiDou satellites that are relatively closer to the ground, thereby shortening the data transmission distance and improving data integrity, thus reducing the bit error rate. It should be noted that the low-orbit satellites mentioned in this invention refer to all BeiDou satellites that are closer to the ground, and this only applies to satellites in the BeiDou system. If F is greater than F0, it indicates that the data integrity score in the current transmission process meets the requirements. The average integrity score is not a key factor affecting the transmission process. Therefore, if B is greater than B1 and less than or equal to B2, it indicates that the transmission process does not meet the standard based on the bit error rate, and the cause can be determined based on the difference between B and B2.

[0068] Furthermore, the process of adjusting the proportion of low-orbit satellites in the BeiDou satellite system includes: determining to adjust the proportion when the average integrity is less than or equal to the critical average integrity; calculating the difference between the critical average integrity and the average integrity and recording it as the integrity difference; generating a corresponding instruction based on the comparison result between the integrity difference and a preset integrity difference to determine to increase the proportion, wherein the increase in the proportion is positively correlated with the integrity difference; wherein the proportion is the ratio of the number of low-orbit satellites to the total number of BeiDou satellites used by the anti-interference base station.

[0069] Specifically, in this embodiment, when determining the required adjustment ratio, the preset integrity difference D0 can be divided into a first preset integrity D1 and a second preset integrity D2. The increase in the ratio is accurately determined by comparing the integrity difference D with D1 and D2. Assuming the number of satellites used for current anti-interference base station positioning information transmission is 20 and the number of low-orbit satellites is 2, the ratio is 0.1. D1 = 0.02% and D2 = 0.04%. The comparison process between D and D1 and D2 is as follows: if D is less than or equal to D1, then a corresponding first adjustment ratio command is generated to control the satellites. The original quantity ratio is increased to 0.15. If D is greater than D1 and less than or equal to D2, a second adjustment quantity ratio command is generated to increase the original quantity ratio of BeiDou satellites to 0.2. If D is greater than D2, a third adjustment quantity ratio command is generated to increase the original quantity ratio of BeiDou satellites to 0.25. If D is much greater than D2, it is directly determined that the number of satellites used in the current transmission process is insufficient, requiring the use of more satellites, or that there is a fault in the entire transmission process, requiring maintenance. It should also be noted that after determining the quantity ratio, the number of low-orbit satellites is rounded up. It is understandable that the quantity ratio can also be set to other values, for example, when D is greater than D2, the original quantity ratio is increased to 0.3. Moreover, the quantity ratio needs to be determined in conjunction with the actual number of low-orbit satellites.

[0070] Please see Figure 4 The diagram illustrates the logic for determining the reasons why the transmission process of location information does not meet the standard based on the bit error rate difference, and the corresponding processing steps in this embodiment. The process of determining the reasons for non-compliance based on the difference between the bit error rate and the preset bit error rate includes: calculating the difference between the bit error rate and the preset bit error rate and recording it as the bit rate difference; determining the reasons for non-compliance based on the comparison result between the bit rate difference and the critical bit rate difference; and determining corresponding processing based on the reasons, either according to the transmit / receive strength ratio or according to the bit rate variance. The transmit / receive strength ratio is the ratio of the strength of the received signal to the strength of the transmitted signal at the anti-interference base station, and the bit rate variance is determined by variance calculation based on the historical bit error rates obtained from several periodic detections.

[0071] Specifically, in this embodiment, the critical code rate difference C0 is set to 0.3 × 10⁻⁶. -5The comparison process based on the bit rate difference C and C0 is as follows: If C is less than or equal to C0, it means that C in the current transmission process is quite small, and B does not exceed B2 by much. Therefore, although the bit error rate is unqualified at this time, it is still within an acceptable range, and the impact on the transmission process not meeting the standard is relatively small. The signal transmit / receive strength ratio M can be obtained, and the corresponding processing is determined based on the comparison result of the transmit / receive strength ratio M and the critical transmit / receive strength ratio M0. If C is greater than C0, it means that the current B exceeds B2 by much. In order to accurately determine the reason why the bit error rate B under the current period detection is relatively large and the reason why the current transmission process does not meet the standard, the bit error rates B under the historical detection can be obtained. The variance is calculated based on the current B and the various historical bit error rates B to obtain the bit rate variance L. The corresponding processing is determined based on the comparison result of the bit rate variance L and the critical bit rate variance L0.

[0072] Furthermore, when it is determined that the code rate difference is less than or equal to the critical code rate difference, the process of determining the corresponding processing based on the transmit / receive strength ratio includes: determining whether to increase the transmit power of the anti-interference base station or decrease the sensitivity threshold of the anti-interference base station based on the comparison result between the transmit / receive strength ratio and the critical transmit / receive strength ratio.

[0073] Specifically, in this embodiment, a critical transmit / receive strength ratio (CR) of M0 is set to -20dB. The comparison process between CR and CR ratio H0 is as follows: If M is less than or equal to M0, it indicates that the anti-interference base station is experiencing signal attenuation when receiving and transmitting signals during the current transmission process. In this case, it can be determined that the transmit power of the anti-interference base station needs to be increased to improve the CR. If M is greater than M0, it indicates that the base station's transmit power is sufficient during the current transmission process, and there is no signal attenuation. Therefore, it can be determined that the reason for the transmission process not meeting the standard is due to an increased bit error rate caused by electromagnetic interference. In this case, it can be determined that the sensitivity threshold of the anti-interference base station should be reduced to reduce electromagnetic interference and decrease the bit error rate caused by weak signals being misjudged as valid signals. When reducing the sensitivity threshold, care should be taken to avoid over-reducing the sensitivity threshold, which could exacerbate the bit error rate. It should be noted that, in order to accurately determine the corresponding processing, this embodiment only considers the direction of increasing transmit power when signal attenuation is identified, and assumes that no other situations will occur; similarly, it only considers the direction of reducing the sensitivity threshold when electromagnetic interference is identified, and assumes that no other situations will occur.

[0074] Furthermore, when it is determined that the transmit / receive strength ratio is less than or equal to the critical transmit / receive strength ratio, the transmit power is increased; the difference between the critical transmit / receive strength ratio and the transmit / receive strength ratio is calculated and recorded as the strength ratio difference; based on the comparison result of the strength ratio difference and the preset strength ratio difference, a corresponding instruction is generated to increase the transmit power, and the increase in transmit power is positively correlated with the strength ratio difference.

[0075] Specifically, in this embodiment, the preset intensity ratio difference T0 can be divided into a first preset intensity ratio difference T1 and a second preset intensity ratio difference T2. The intensity ratio difference T is compared with T1 and T2 to accurately determine the increase in transmission power, thereby achieving automatic adjustment and closed-loop control of the base station. T1 = -3dB and T2 = -6dB. The comparison process between T and T1 and T2 is as follows: if T is less than or equal to T1, a corresponding first transmission power adjustment command is generated to control the anti-interference base station to increase the original transmission power by 2 times; if T is greater than T1 and less than or equal to T2, a corresponding second transmission power adjustment command is generated to control the anti-interference base station to increase the original transmission power by 3 times; if T is greater than T2, a corresponding third transmission power adjustment command is generated to control the anti-interference base station to increase the original transmission power by 4 times. Here, T is not infinitely large. It should be noted that the increase in transmission power can also be set as a numerical value; for example, when T is less than or equal to T1, the increase factor is set to 2.5 times.

[0076] Furthermore, when it is determined that the transmit / receive strength ratio is greater than the critical transmit / receive strength ratio, the sensitivity threshold is reduced; the signal-to-noise ratio of the anti-interference base station is obtained, and a corresponding instruction is generated based on the comparison result of the signal-to-noise ratio and the preset signal-to-noise ratio to reduce the sensitivity threshold. The reduction of the sensitivity threshold is negatively correlated with the signal-to-noise ratio.

[0077] Specifically, in this embodiment, the preset signal-to-noise ratio (SNR) A0 can be divided into a first preset SNR A1 and a second preset SNR A2. By comparing the SNR A with A1 and A2, the reduction range of the sensitivity threshold can be accurately determined. When H is greater than H0, it indicates that the signal power at the receiving end is strong, and the system can withstand a lower sensitivity threshold. By reducing the sensitivity threshold, the ability to capture weak signals is enhanced, thereby increasing the data integrity of the data packets. A1 = 30dB and A2 = 34dB are set. The comparison process between A and A1 and A2 is as follows: if A is less than or equal to A1, a corresponding first sensitivity threshold adjustment command is generated to control the anti-interference base station to reduce the sensitivity threshold by 20% based on the original sensitivity threshold; if A is greater than A1 and less than or equal to A2, a corresponding second sensitivity threshold adjustment command is generated to control the anti-interference base station to reduce the sensitivity threshold by 14% based on the original sensitivity threshold; if A is greater than A2, a corresponding third sensitivity threshold adjustment command is generated to control the anti-interference base station to reduce the sensitivity threshold by 10% based on the original sensitivity threshold. It should be noted that the reduction rate of the sensitivity threshold can also be set numerically. For example, when A is less than or equal to A1, the reduction rate can be set to 18%. The higher the signal-to-noise ratio, the lower the sensitivity threshold required for anti-interference base stations, and the reduction rate usually shows a decreasing trend. This is because the interference of noise on the signal is significantly reduced under high signal-to-noise ratio, and the marginal benefit of further optimizing sensitivity decreases.

[0078] Furthermore, when it is determined that the bit rate difference is greater than the critical bit rate difference, the process of determining the corresponding processing based on the bit rate variance includes: determining whether to add the filtering in the preprocessing process based on the comparison result of the bit rate variance and the critical bit rate variance.

[0079] Specifically, in this embodiment, a critical code rate variance L0 = 0.042 can be set based on historical data. The specific process of comparing the code rate variance L with L0 is as follows: If L is less than or equal to L0, it is determined that several historical bit error rates are relatively close to the current bit error rate in terms of data. This indicates that most of the historical bit error rates derived from the current unqualified bit error rate are also unqualified. It can be determined that the reason why the transmission process does not meet the standard is that there is a timing error, which causes the bit error rate detected in each cycle to be the same. At this time, the timing error can be updated, and the propagation delay caused by the satellite clock difference can be compensated by combining the differential correction data of the master control station (such as RTK technology) to reduce the timing error and thus reduce the bit error rate. If L is greater than L0, it indicates that there is a significant difference between the values ​​of several historical bit error rates and the current bit error rate in the time dimension. Therefore, the high bit error rate in the current transmission process is due to the problem of the current anti-interference base station's preprocessing of the radio frequency signal. At this time, the filtering in the preprocessing process can be adjusted to reduce the bit error rate.

[0080] Furthermore, when it is determined that the code rate variance is greater than the critical code rate variance, the filtering is increased; the signal-to-noise ratio of the anti-interference base station is obtained, and a corresponding instruction is generated based on the comparison result of the signal-to-noise ratio and the preset signal-to-noise ratio to increase the filtering, wherein the increase in filtering is negatively correlated with the signal-to-noise ratio.

[0081] Specifically, in this embodiment, a new A1 = 26dB and A2 = 29dB can be set. The specific process of comparing A with A1 and A2 is as follows: if A is less than or equal to A1, a corresponding first adjustment filter instruction is generated to control the anti-interference base station to increase the filter by 50% based on the original filter; if A is greater than A1 and less than or equal to A2, a corresponding second adjustment filter instruction is generated to control the anti-interference base station to increase the filter by 40% based on the original filter; if A is greater than A2, a corresponding third adjustment filter instruction is generated to control the anti-interference base station to increase the filter by 30% based on the original filter. At this time, the maximum value of A must not exceed 35dB. It should be noted that the increase in filter can also be set to other values, such as when A is greater than A2, it is determined that the filter will be increased by 35% based on the original filter. At this point, it is important to pay attention to the signal-to-noise ratio (SNR) value. If the SNR is too high, the filtering needs to be reduced accordingly. When the SNR is higher, the noise component in the signal is relatively reduced. At this time, the amplitude adjustment of the filter usually tends to decrease because a high SNR means that the signal quality is better and there is no need to suppress noise through large-amplitude filtering. Over-filtering may actually lead to signal distortion.

[0082] It is understood that no specific limitation is made to any preset parameter or critical parameter in the embodiments of the present invention, and the above values ​​are not limited thereto. Those skilled in the art can make corresponding adjustments to the preset parameters or critical parameters according to actual needs, analysis of historical data, or equipment usage.

[0083] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0084] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for transmitting positioning information from an anti-interference BeiDou positioning base station, characterized in that, include: The user terminal generates and transmits a radio frequency signal containing the raw data. The radio frequency signal is obtained by an anti-interference base station and preprocessed to obtain several data packets, which are then transmitted and received by the main control station. The system acquires several data packets transmitted by the main control station via BeiDou satellites, processes them to obtain navigation messages, and then sends the navigation messages to the corresponding anti-interference base stations via the main control station. The main control station obtains the bit error rate and data integrity of each data packet generated during the process of the BeiDou satellite generating the navigation message. The error rate is used to determine whether the transmission process of the positioning information conforms to the standard, and the determination result is combined with the data integrity to determine whether the transmission process conforms to the standard. The bit error rate is periodically detected, and a judgment is made based on the comparison result between the bit error rate and the preset bit error rate. Based on the judgment result and the data integrity corresponding to each data packet, a judgment is made on whether the transmission process meets the standard. When it is determined that the transmission process does not meet the standard, the reason for non-compliance is determined based on the difference between the bit error rate and the preset bit error rate. Based on the aforementioned reasons, corresponding instructions are generated, which may be to determine the proportion of low-orbit satellites in the BeiDou satellites, or the transmission power of the anti-interference base station, or the sensitivity threshold of the anti-interference base station, or the filtering in the preprocessing process. Adjust the quantity ratio, the transmission power, the sensitivity threshold, or the filtering based on the instructions.

2. The positioning information transmission method for an anti-interference BeiDou positioning base station according to claim 1, characterized in that, The process of determining whether the transmission process conforms to the standard based on the data integrity of each data packet includes: Obtain the completeness of each of the aforementioned data to determine the average completeness; Based on the comparison results between the average integrity and the critical average integrity, it is determined whether to adjust the proportion of low-orbit satellites in the BeiDou satellite system.

3. The positioning information transmission method for an anti-interference BeiDou positioning base station according to claim 2, characterized in that, The process of adjusting the proportion of low-orbit satellites in the BeiDou satellite system includes: When the average completeness is determined to be less than or equal to the critical average completeness, the quantity ratio is adjusted accordingly. Calculate the difference between the critical average completeness and the average completeness and record it as the completeness difference; Based on the comparison result between the integrity difference and the preset integrity difference, a corresponding instruction is generated to determine to increase the quantity ratio. The increase in the quantity ratio is positively correlated with the integrity difference. The quantity ratio is the ratio of the number of low-orbit satellites to the total number of BeiDou satellites used in conjunction with the anti-interference base station.

4. The positioning information transmission method of the anti-interference BeiDou positioning base station according to claim 1, characterized in that, The process of determining the reasons for non-compliance with the standard based on the difference between the bit error rate and the preset bit error rate includes: Calculate the difference between the bit error rate and the preset bit error rate and record it as the bit rate difference; The reason for non-compliance with the standard is determined based on the comparison result between the bit rate difference and the critical bit rate difference; Based on the aforementioned reasons, the corresponding processing is determined according to the transmit / receive strength ratio or according to the code rate variance. The transmit / receive strength ratio is the ratio of the strength of the received signal to the strength of the transmitted signal at the anti-interference base station, and the code rate variance is determined by variance calculation based on the historical bit error rates obtained from several periodic detections.

5. The positioning information transmission method for an anti-interference BeiDou positioning base station according to claim 4, characterized in that, When determining that the bit rate difference is less than or equal to the critical bit rate difference, the process of determining the corresponding processing based on the transmit / receive strength ratio includes: Based on the comparison between the transmit / receive strength ratio and the critical transmit / receive strength ratio, it is determined whether to increase the transmit power of the anti-interference base station or decrease the sensitivity threshold of the anti-interference base station.

6. The method for transmitting positioning information of an anti-interference BeiDou positioning base station according to claim 5, characterized in that, When it is determined that the transmit / receive strength ratio is less than or equal to the critical transmit / receive strength ratio, the transmit power is increased. Calculate the difference between the critical transmit / receive strength ratio and the transmit / receive strength ratio, and record it as the strength ratio difference; Based on the comparison result between the intensity ratio difference and the preset intensity ratio difference, a corresponding instruction is generated to increase the transmission power. The increase in transmission power is positively correlated with the intensity ratio difference.

7. The positioning information transmission method for an anti-interference BeiDou positioning base station according to claim 5, characterized in that, When it is determined that the transmit / receive strength ratio is greater than the critical transmit / receive strength ratio, the sensitivity threshold is reduced. The signal-to-noise ratio (SNR) of the anti-interference base station is obtained, and a corresponding instruction is generated based on the comparison result between the SNR and the preset SNR to reduce the sensitivity threshold. The reduction in the sensitivity threshold is negatively correlated with the SNR.

8. The method for transmitting positioning information of an anti-interference BeiDou positioning base station according to claim 4, characterized in that, When it is determined that the bitrate difference is greater than the critical bitrate difference, the process of determining the corresponding processing based on the bitrate variance includes: Based on the comparison result between the bit rate variance and the critical bit rate variance, it is determined whether to add the filtering in the preprocessing process.

9. The method for transmitting positioning information of an anti-interference BeiDou positioning base station according to claim 8, characterized in that, When it is determined that the bit rate variance is greater than the critical bit rate variance, the filtering is increased. The signal-to-noise ratio (SNR) of the anti-interference base station is obtained, and a corresponding instruction is generated based on the comparison result between the SNR and the preset SNR to increase the filtering. The increase in filtering is negatively correlated with the SNR.

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