Beidou short message positioning information intelligent transmission method based on multi-parameter fusion

Abstract

The present application relates to the field of Beidou satellite positioning technology, and more particularly to a Beidou short message positioning information intelligent transmission method based on multi-parameter fusion, comprising: preprocessing collected multi-source data and positioning data to generate short message fusion data, and sequentially compressing and encrypting the fusion data to form encrypted data; transmitting the encrypted data to a receiving end through a Beidou satellite, and the receiving end analyzes and restores the encrypted data to obtain the short message fusion data and performs corresponding processing; determining whether the neighborhood terminal density perception coefficient needs to be increased; determining whether the disturbance waiting threshold needs to be increased; and determining the signal integration time extension coefficient. The present application improves the transmission stability of Beidou short message positioning information.

Description

Technical Field

[0001] This invention relates to the field of BeiDou satellite positioning technology, and in particular to an intelligent transmission method for BeiDou short message positioning information based on multi-parameter fusion. Background Technology

[0002] In the current context of the deepening application of the BeiDou Navigation Satellite System and the continuous evolution of terminal positioning requirements towards high reliability and low power consumption, intelligent transmission capabilities are increasingly becoming a core bottleneck in key scenarios such as emergency communication, offshore operations, and geological disaster monitoring. The core value of the intelligent transmission method for BeiDou short message positioning information based on multi-parameter fusion lies in its ability to generate optimized positioning information from multi-source sensor data through data fusion technology. By coordinating compression encryption and transmission control strategies, it constructs a transmission scheme that combines high reliability and low power consumption, driving the upgrade of BeiDou short message communication from "data transmission" to "intelligent information management and control," which has significant strategic and application value. However, existing transmission methods still generally suffer from insufficient multi-source data fusion and dynamic coordination of transmission strategies, imprecise channel characteristic perception granularity, and limited adaptive transmission power control capabilities, making it difficult to fully meet the stringent dual requirements of high reliability and low power consumption for positioning information transmission in complex environments.

[0003] Chinese Patent Publication No. CN114553289A discloses a communication terminal based on BeiDou communication, comprising: a control terminal, a BeiDou navigation system, a voice communication system, a positioning assistance system, a data encryption unit, and a wireless transmission unit. The output of the BeiDou navigation system is connected to the positioning assistance system; the outputs of the positioning assistance system and the voice communication system are connected to the data encryption unit; the output of the data encryption unit is connected to the wireless transmission unit; the control terminal is electrically connected to the BeiDou navigation system, the voice communication system, the positioning assistance system, the data encryption unit, and the wireless transmission unit; the BeiDou navigation system operates based on a BeiDou chip. The voice communication system includes a voice input unit, a voice output unit, a noise reduction unit, and an electromagnetic interference (EMI) suppression unit. The voice input unit's output is connected to the noise reduction unit and the EMI suppression unit. The outputs of the noise reduction unit and the EMI suppression unit are connected to a control terminal. The control terminal's output is connected to the voice output unit. The positioning assistance system is specifically an A-GPS positioning system, which is bidirectionally connected to the control terminal. The data encryption unit operates based on data encryption algorithms, RSA, knapsack algorithms, and ECC. The wireless transmission unit includes a network transmission unit, a near-field communication module, a Bluetooth transceiver module, and a local area network communication module. The control terminal operates on any of the ARM, Qualcomm, or MediaTek processors. Therefore, it is evident that the BeiDou-based communication terminal suffers from insufficient transmission stability of BeiDou short message positioning information in complex electromagnetic environments due to the lack of a coordination mechanism between multi-source positioning data fusion and intelligent transmission control. Summary of the Invention

[0004] To address this issue, the present invention provides an intelligent transmission method for BeiDou short message positioning information based on multi-parameter fusion, which overcomes the problem of insufficient transmission stability of BeiDou short message positioning information in complex electromagnetic environments due to the lack of a coordination mechanism between multi-source positioning data fusion and intelligent transmission control in the prior art.

[0005] To achieve the above objectives, this invention provides a method for intelligent transmission of BeiDou short message positioning information based on multi-parameter fusion, comprising:

[0006] The collected multi-source data and positioning data are preprocessed to generate short message fused data, and the fused data is compressed and encrypted in sequence to form encrypted data;

[0007] The encrypted data is transmitted to the receiving end via BeiDou satellite. The receiving end parses and restores the encrypted data to obtain the short message fusion data and performs corresponding processing.

[0008] The transmission success rate of BeiDou short messages within a unit time is obtained, and the transmission stability of BeiDou short message positioning information is determined based on the transmission success rate of BeiDou short messages within the unit time.

[0009] If the transmission stability of the BeiDou short message positioning information does not meet the requirements, then it is determined whether it is necessary to increase the density sensing coefficient of the neighboring terminals.

[0010] If it is not necessary to increase the density sensing coefficient of neighboring terminals, then obtain the delay jitter amplitude of the BeiDou signal to determine whether the transmission effectiveness of the BeiDou signal meets the requirements;

[0011] If the transmission validity of the BeiDou signal does not meet the requirements, then determine whether it is necessary to increase the disturbance waiting threshold;

[0012] If it is not necessary to increase the disturbance waiting threshold, the signal integration time extension coefficient is determined based on the proportion of BeiDou satellite lock failure time per unit time.

[0013] Furthermore, determining whether the transmission stability of BeiDou short message positioning information meets the requirements based on the transmission success rate of BeiDou short messages per unit time includes:

[0014] The transmission success rate of BeiDou short messages per unit time is compared with the preset second success rate.

[0015] If the transmission success rate of BeiDou short messages within the unit time is greater than the preset second success rate, then the transmission stability of BeiDou short message positioning information is determined to meet the requirements.

[0016] If the transmission success rate of BeiDou short messages within a unit of time is less than or equal to the preset second success rate, then the transmission stability of the BeiDou short message positioning information is determined to be unsatisfactory.

[0017] Further, determine whether it is necessary to increase the density sensing coefficient of neighboring terminals, including:

[0018] The transmission success rate of BeiDou short messages per unit time is compared with the preset first success rate and the preset second success rate, respectively.

[0019] If the transmission success rate of BeiDou short messages per unit time is less than or equal to the preset first success rate, then it is determined that the density sensing coefficient of neighboring terminals needs to be increased.

[0020] If the transmission success rate of BeiDou short messages per unit time is greater than the preset first success rate and less than or equal to the preset second success rate, then it is determined that there is no need to increase the neighboring terminal density sensing coefficient.

[0021] Furthermore, the increase in the neighborhood terminal density sensing coefficient is determined by the difference between the preset first success rate and the transmission success rate of BeiDou short messages per unit time.

[0022] Furthermore, the validity of BeiDou signal transmission is determined based on the timing jitter amplitude of the BeiDou signal, including:

[0023] The time delay jitter amplitude of the BeiDou signal is compared with a preset first jitter amplitude;

[0024] If the delay jitter amplitude of the BeiDou signal is less than or equal to the preset first jitter amplitude, then the transmission validity of the BeiDou signal is determined to meet the requirements, and the neighboring terminal density sensing coefficient is determined to meet the requirements.

[0025] If the delay jitter of the BeiDou signal is greater than the preset first jitter amplitude, then the transmission validity of the BeiDou signal is determined to be unsatisfactory.

[0026] Further, determine whether it is necessary to increase the disturbance wait threshold, including:

[0027] The time delay jitter amplitude of the BeiDou signal is compared with the preset first jitter amplitude and the preset second jitter amplitude, respectively;

[0028] If the delay jitter amplitude of the BeiDou signal is greater than the preset first jitter amplitude and less than or equal to the preset second jitter amplitude, then it is determined that the disturbance waiting threshold needs to be increased.

[0029] If the delay jitter of the BeiDou signal is greater than the preset second jitter amplitude, then it is determined that there is no need to increase the disturbance waiting threshold.

[0030] Furthermore, the increase in the disturbance waiting threshold is determined by the difference between the time delay jitter amplitude of the BeiDou signal and the preset first jitter amplitude.

[0031] Furthermore, the signal integral time extension coefficient is determined based on the proportion of BeiDou satellite lock failure time per unit time, including:

[0032] The percentage of time during which BeiDou satellite lock-on failures occurred within the specified unit of time was compared with a preset percentage of time.

[0033] If the percentage of BeiDou satellite lock failures per unit time is less than or equal to the preset percentage of time, then the effectiveness of BeiDou signal acquisition is determined to meet the requirements, and there is no need to increase the signal integration time extension coefficient. It is also determined whether the disturbance waiting threshold meets the requirements.

[0034] If the percentage of time during which BeiDou satellite lock-on fails is greater than the preset percentage, then the effectiveness of BeiDou signal acquisition is determined to be unsatisfactory, and the signal integration time extension coefficient needs to be increased.

[0035] Furthermore, the percentage of time during which BeiDou satellite lock-on failures occur per unit time is the ratio of the cumulative time during which the BeiDou satellite navigation receiver fails to successfully lock onto and track a sufficient number of satellite signals within a fixed period to the duration of that fixed period.

[0036] Furthermore, the increase in the signal integration time extension coefficient is determined by the difference between the percentage of BeiDou satellite lock failures per unit time and the preset percentage of such failures.

[0037] Compared with existing technologies, the beneficial effects of this invention are as follows: The method of this invention adjusts the density sensing coefficient of neighboring terminals based on the transmission success rate of BeiDou short messages per unit time. Since the BeiDou short message channel is a shared resource, channel congestion is prone to occur when multiple terminals transmit concurrently within a region. This may lead to terminal requests being rejected by the satellite due to collisions in some areas, resulting in a decrease in transmission success rate. By increasing the density sensing coefficient of neighboring terminals, terminals can send messages adapted to the channel capacity, reducing invalid requests occupying resources, prioritizing the carrying of critical positioning information, and reducing the probability of channel collisions. The method also adjusts the disturbance waiting threshold based on the jitter amplitude of the BeiDou signal delay. Because atmospheric ionospheric disturbances caused by lightning during thunderstorms can temporarily change the propagation speed and path of L-band signals, leading to… Signal delay jitter can cause short message frame synchronization failures. Increasing the disturbance waiting threshold can extend the waiting time, allowing the terminal to miss the period of most severe ionospheric jitter during thunderstorms, reducing the probability of synchronization failures and increasing the transmission opportunities during stable periods. The signal integration time extension coefficient is adjusted based on the proportion of BeiDou satellite lock-on failures per unit time. Because glass curtain walls and metal structures of tall buildings in cities can reflect satellite signals, forming delayed multipath signals, these signals are superimposed on the direct signal at the receiver, causing signal amplitude fluctuations and even preventing satellite lock-on. Increasing the signal integration time extension coefficient can reduce satellite tracking interruptions caused by severe signal fluctuations, lower the satellite lock-on failure rate, and thus improve satellite lock-on stability, thereby enhancing the transmission stability of BeiDou short message positioning information.

[0038] Furthermore, the method of the present invention adjusts the neighboring terminal density sensing coefficient by setting a preset first success rate and a preset second success rate. Since the BeiDou short message channel is a shared resource, channel congestion is likely to occur when multiple terminals transmit concurrently in the area. This may cause terminal requests to be rejected by the satellite due to collision conflicts in some areas, resulting in a decrease in transmission success rate. By increasing the neighboring terminal density sensing coefficient, the terminal can send messages that are adapted to the channel capacity, reduce the resource occupation of invalid requests, prioritize the carrying of key positioning information, and reduce the probability of channel collisions, thereby further improving the transmission stability of BeiDou short message positioning information.

[0039] Furthermore, the method of the present invention adjusts the disturbance waiting threshold by setting a preset first jitter amplitude and a preset second jitter amplitude. Since atmospheric ionospheric disturbances caused by lightning during thunderstorms can briefly change the propagation speed and path of L-band signals, causing signal delay jitter and resulting in short message frame synchronization failure, increasing the disturbance waiting threshold can extend the waiting time, allowing the terminal to miss the period of most severe ionospheric jitter during thunderstorms, reducing the probability of synchronization failure, increasing the transmission opportunity during stable periods, and further improving the transmission stability of BeiDou short message positioning information.

[0040] Furthermore, the method described in this invention adjusts the signal integration time extension coefficient by setting a preset duration ratio. Since glass curtain walls and metal structures of tall buildings in cities reflect satellite signals, forming delayed multipath signals, these signals are superimposed on the direct signal at the receiving end, causing signal amplitude fluctuations and even failure to lock onto the satellite. By increasing the signal integration time extension coefficient, satellite tracking interruptions caused by severe signal fluctuations can be reduced, the satellite locking failure rate can be lowered, thereby improving the satellite locking stability and further enhancing the transmission stability of BeiDou short message positioning information. Attached Figure Description

[0041] Figure 1 This is an overall flowchart of the intelligent transmission method for BeiDou short message positioning information based on multi-parameter fusion, according to an embodiment of the present invention.

[0042] Figure 2 This is a flowchart illustrating the process of determining whether to increase the neighboring terminal density sensing coefficient in the intelligent transmission method of BeiDou short message positioning information based on multi-parameter fusion according to an embodiment of the present invention.

[0043] Figure 3 This is a flowchart illustrating the process of determining whether to increase the disturbance waiting threshold in the intelligent transmission method of BeiDou short message positioning information based on multi-parameter fusion according to an embodiment of the present invention.

[0044] Figure 4 This is a flowchart illustrating the determination of the signal integration time extension coefficient in the intelligent transmission method for BeiDou short message positioning information based on multi-parameter fusion, according to an embodiment of the present invention. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] Please see Figure 1 The diagram shown is an overall flowchart of the intelligent transmission method for BeiDou short message positioning information based on multi-parameter fusion according to an embodiment of the present invention.

[0048] This invention provides a method for intelligent transmission of BeiDou short message positioning information based on multi-parameter fusion, comprising:

[0049] Step S1: Preprocess the collected multi-source data and positioning data to generate short message fusion data, and compress and encrypt the fusion data in sequence to form encrypted data;

[0050] Step S2: The encrypted data is transmitted to the receiving end via BeiDou satellite. The receiving end parses and restores the encrypted data to obtain the short message fusion data and performs corresponding processing.

[0051] Step S3: Obtain the transmission success rate of BeiDou short messages within a unit time, and determine whether the transmission stability of BeiDou short message positioning information meets the requirements based on the transmission success rate of BeiDou short messages within a unit time.

[0052] Step S4: If the transmission stability of the BeiDou short message positioning information does not meet the requirements, determine whether it is necessary to increase the density sensing coefficient of the neighboring terminals.

[0053] Step S5: If it is not necessary to increase the density sensing coefficient of neighboring terminals, then obtain the time delay jitter amplitude of the Beidou signal to determine whether the transmission effectiveness of the Beidou signal meets the requirements.

[0054] Step S6: If the transmission validity of the BeiDou signal does not meet the requirements, determine whether it is necessary to increase the disturbance waiting threshold.

[0055] Step S7: If it is not necessary to increase the disturbance waiting threshold, then determine the signal integration time extension coefficient based on the proportion of BeiDou satellite locking failure time per unit time.

[0056] Specifically, the multi-source data includes sea surface atmospheric pressure, vehicle speed, and the three-axis magnetic field strength of the weather airship.

[0057] Specifically, preprocessing includes cleaning, time alignment, and data fusion.

[0058] Specifically, the short message fusion data includes the cleaned sea surface atmospheric pressure value, the time-aligned instantaneous vehicle speed, and the three-axis magnetic field strength at the location of the weather airship.

[0059] Specifically, encrypted data is data in a garbled form that cannot be directly parsed, which is generated by converting short message fusion data through encryption rules.

[0060] Specifically, the process of parsing and restoring encrypted data involves sequentially performing decryption, decompression, field parsing, and data reconstruction operations on the encrypted data to restore the original structure of the short message fusion data and extract the location information and multi-source data content.

[0061] Specifically, the corresponding processing involves the receiving end analyzing and evaluating the transmission quality of the short messages and the working status of the BeiDou satellites based on the parsed and restored short message fusion data, providing feedback based on the evaluation results, and generating optimization and adjustment strategies.

[0062] Specifically, the neighborhood terminal density perception coefficient is a key parameter for measuring the impact of the density of terminal devices in a local area on communication quality.

[0063] Specifically, the disturbance waiting threshold is the maximum duration of interference that triggers transmission strategy adjustment or enters a waiting observation state when the system detects external environmental disturbances.

[0064] Specifically, the signal integration time extension factor is a dimensionless parameter that extends the duration of coherent accumulation aimed at improving the signal-to-noise ratio.

[0065] In implementation, the method of this invention adjusts the density sensing coefficient of neighboring terminals based on the transmission success rate of BeiDou short messages per unit time. Since the BeiDou short message channel is a shared resource, channel congestion is prone to occur when multiple terminals transmit concurrently within a region. This may lead to terminal requests being rejected by the satellite due to collisions in some areas, resulting in a decrease in transmission success rate. By increasing the density sensing coefficient of neighboring terminals, terminals can send messages adapted to the channel capacity, reducing invalid requests occupying resources, prioritizing the carrying of critical positioning information, and reducing the probability of channel collisions. The method also adjusts the disturbance waiting threshold based on the amplitude of BeiDou signal delay jitter. During thunderstorms, atmospheric ionospheric disturbances caused by lightning can briefly alter the propagation speed and path of L-band signals, causing signal delay jitter. This can lead to short message frame synchronization failure. By increasing the disturbance waiting threshold, the waiting time can be extended, allowing the terminal to miss the period of most severe ionospheric jitter during thunderstorms, reducing the probability of synchronization failure, and increasing the transmission opportunity during stable periods. The signal integration time extension coefficient is adjusted according to the proportion of BeiDou satellite locking failure time per unit time. Because glass curtain walls and metal structures of tall buildings in cities reflect satellite signals, forming delayed multipath signals, which are superimposed on the direct signal at the receiving end, causing signal amplitude fluctuations and even failure to lock onto the satellite. By increasing the signal integration time extension coefficient, satellite tracking interruptions caused by severe signal fluctuations can be reduced, the satellite locking failure rate can be lowered, and the satellite locking stability can be improved, thereby improving the transmission stability of BeiDou short message positioning information.

[0066] Please continue reading. Figure 2 As shown, it is a flowchart illustrating the process of determining whether to increase the density sensing coefficient of neighboring terminals in the BeiDou short message positioning information intelligent transmission method based on multi-parameter fusion according to an embodiment of the present invention.

[0067] Specifically, determining whether the transmission stability of BeiDou short message positioning information meets the requirements based on the transmission success rate of BeiDou short messages within the unit time includes:

[0068] The transmission success rate of BeiDou short messages per unit time is compared with the preset second success rate.

[0069] If the transmission success rate of BeiDou short messages within the unit time is greater than the preset second success rate, then the transmission stability of BeiDou short message positioning information is determined to meet the requirements.

[0070] If the transmission success rate of BeiDou short messages within a unit of time is less than or equal to the preset second success rate, then the transmission stability of the BeiDou short message positioning information is determined to be unsatisfactory.

[0071] One possible reason for the failure to meet the stability requirements of BeiDou short message positioning information transmission is that the transmission effectiveness of the BeiDou signal is not up to standard, or the density sensing coefficient of neighboring terminals is not up to standard. The next step is to determine which specific cause it is, which is also the process of determining whether to increase the density sensing coefficient of neighboring terminals.

[0072] Specifically, determining whether it is necessary to increase the density sensing coefficient of neighboring terminals includes:

[0073] The transmission success rate of BeiDou short messages per unit time is compared with the preset first success rate and the preset second success rate, respectively.

[0074] If the transmission success rate of BeiDou short messages per unit time is greater than the preset first success rate and less than or equal to the preset second success rate, then it is determined that there is no need to increase the neighboring terminal density sensing coefficient.

[0075] If the success rate of BeiDou short message transmission per unit time is less than or equal to the preset first success rate, then it is determined that the density sensing coefficient of neighboring terminals needs to be increased.

[0076] Specifically, when the success rate of BeiDou short message transmission per unit time is less than or equal to a preset first success rate, it is determined that the reason for the failure of BeiDou short message positioning information transmission stability is that the neighboring terminal density sensing coefficient does not meet the requirements, thus requiring an increase in the neighboring terminal density sensing coefficient. When the success rate of BeiDou short message transmission per unit time is greater than a preset first success rate but less than or equal to a preset second success rate, it can be preliminarily determined that the transmission effectiveness of BeiDou signal does not meet the requirements. The next step is to determine the final validity of BeiDou signal transmission based on the time delay jitter amplitude, i.e., to determine whether the failure of BeiDou short message positioning information transmission stability is due to the failure of BeiDou signal transmission effectiveness.

[0077] Understandably, the preset first success rate is lower than the preset second success rate. The three intervals divided by the preset first and second success rates correspond to three different scenarios:

[0078] The first interval is when the transmission success rate of BeiDou short messages per unit time is less than or equal to the preset first success rate. The corresponding situation is: since the BeiDou short message channel is a shared resource, channel blocking is likely to occur when multiple terminals transmit concurrently in the area. This may cause the terminal to send a request in some areas to be rejected by the satellite due to collision conflicts, resulting in a decrease in the transmission success rate. At this time, it is necessary to adjust the neighboring terminal density sensing coefficient.

[0079] The second interval is when the transmission success rate of BeiDou short messages per unit time is greater than the preset first success rate and less than or equal to the preset second success rate. The corresponding situation is: due to the atmospheric ionospheric disturbance caused by lightning in thunderstorm weather, the propagation speed and path of L-band signals will be temporarily changed, causing signal delay jitter and resulting in short message frame synchronization failure. At this time, it is necessary to further judge whether the transmission effectiveness of BeiDou signals meets the requirements.

[0080] The third interval is when the transmission success rate of BeiDou short messages per unit time is greater than the preset second success rate. The corresponding situation is that the transmission stability of BeiDou short message positioning information meets the requirements, and no adjustment is needed.

[0081] Understandably, using preset first and second success rates to characterize the transmission stability of BeiDou short message positioning information during transmission is essentially a hierarchical control logic based on channel state and transmission quality. This avoids the limitations of a single threshold in evaluating transmission performance under complex electromagnetic environments and achieves a linkage between hierarchical judgment of communication link reliability and dynamic adjustment of transmission parameters, ultimately meeting the dual requirements of reliability and timeliness in emergency communication under harsh environments. The core function of the preset first success rate is to provide an early warning threshold for triggering channel anomaly diagnosis; the core function of the preset second success rate is to serve as the decision basis for initiating neighborhood terminal density control. The preset first and second success rates can be set according to actual operating conditions. The setting of the preset first and second success rates aims to ensure the transmission stability and practicality of BeiDou short message positioning information. Optionally, the preset first and second success rates are determined through a limited number of experiments by evaluating the transmission effect of different success rates on BeiDou short message positioning information. The determined preset first and second success rates should be neither too low nor cause excessive interference to the transmission process of BeiDou short message positioning information. For example, the preset first success rate is generally selected in the range of [94%, 96%], and the preset second success rate is generally selected in the range of [97%, 99%].

[0082] Preferably, the first success rate is 95% in the preferred embodiment, and the second success rate is 98% in the preferred embodiment.

[0083] Specifically, the success rate of BeiDou short message transmission per unit time is the ratio of the number of successfully transmitted BeiDou short messages per unit time to the total number of BeiDou short messages transmitted.

[0084] Specifically, L-band signals are radio waves in the transition region between the ultra-high frequency and microwave frequency bands, with a frequency range of 1-2 GHz.

[0085] Specifically, the increase in the neighborhood terminal density sensing coefficient is determined by the difference between a preset first success rate and the transmission success rate of BeiDou short messages per unit time.

[0086] Specifically, when the difference between the preset first success rate and the transmission success rate of BeiDou short messages per unit time is within 2%, the neighboring terminal density perception coefficient increases to 1.1 times the original value. When the difference between the preset first success rate and the transmission success rate of BeiDou short messages per unit time exceeds 2%, the neighboring terminal density perception coefficient increases by 0.02 for every 1% increase beyond the original 1.1 times. For example, when the difference between the preset first success rate and the transmission success rate of BeiDou short messages per unit time is 4%, the current neighboring terminal density perception coefficient is 0.7, and the increased neighboring terminal density perception coefficient is 0.7×1.1+0.02×2=0.81.

[0087] In practice, the method of the present invention adjusts the density sensing coefficient of neighboring terminals by setting a preset first success rate and a preset second success rate. Since the BeiDou short message channel is a shared resource, channel congestion is likely to occur when multiple terminals transmit concurrently in the area. This may cause terminal requests to be rejected by the satellite due to collisions in some areas, resulting in a decrease in the transmission success rate. By increasing the density sensing coefficient of neighboring terminals, the terminal can send messages that are adapted to the channel capacity, reduce the resource occupation of invalid requests, prioritize the carrying of key positioning information, and reduce the probability of channel collisions, thereby further improving the transmission stability of BeiDou short message positioning information.

[0088] Please continue reading. Figure 3 As shown, it is a flowchart illustrating the process of determining whether to increase the disturbance waiting threshold in the BeiDou short message positioning information intelligent transmission method based on multi-parameter fusion according to an embodiment of the present invention.

[0089] Specifically, determining whether the transmission effectiveness of BeiDou signals meets the requirements based on the timing jitter amplitude of the BeiDou signals includes:

[0090] The time delay jitter amplitude of the BeiDou signal is compared with a preset first jitter amplitude;

[0091] If the delay jitter amplitude of the BeiDou signal is less than or equal to the preset first jitter amplitude, then the transmission validity of the BeiDou signal is determined to meet the requirements, and the neighboring terminal density sensing coefficient is determined to meet the requirements.

[0092] If the delay jitter of the BeiDou signal is greater than the preset first jitter amplitude, then the transmission validity of the BeiDou signal is determined to be unsatisfactory.

[0093] Among them, when the delay jitter amplitude of the BeiDou signal is less than or equal to the preset first jitter amplitude, it is determined that the transmission validity of the BeiDou signal meets the requirements. However, if it has been previously determined that the transmission stability of the BeiDou short message positioning information does not meet the requirements, then it is necessary to further determine whether the density sensing coefficient of the neighboring terminals meets the requirements.

[0094] In implementation, the neighboring terminal density sensing coefficient is compared with the predetermined sensing coefficient threshold to determine whether the neighboring terminal density sensing coefficient meets the requirements. If the actual neighboring terminal density sensing coefficient is less than the predetermined sensing coefficient threshold, the neighboring terminal density sensing coefficient is determined to be unacceptable. The predetermined sensing coefficient threshold is the average value of the neighboring terminal density sensing coefficients monitored in the previous three months of the historical period.

[0095] If the density sensing coefficient of neighboring terminals does not meet the requirements, the density sensing coefficient of neighboring terminals is increased; if the density sensing coefficient of neighboring terminals meets the requirements, the transmission success rate of BeiDou short messages per unit time is re-collected, and the transmission stability of BeiDou short message positioning information is re-evaluated to ensure it meets the requirements.

[0096] When the jitter amplitude of the BeiDou signal delay exceeds a preset first jitter amplitude, it can be determined that the reason for the non-compliance of the BeiDou short message positioning information transmission stability is that the transmission effectiveness of the BeiDou signal is not up to standard. The reasons for this non-compliance may be that the disturbance waiting threshold is not met, or that the acquisition effectiveness of the BeiDou signal is not up to standard. The next step is to determine which specific cause it is, which involves deciding whether to increase the disturbance waiting threshold.

[0097] Specifically, determining whether the disturbance wait threshold needs to be increased includes:

[0098] The time delay jitter amplitude of the BeiDou signal is compared with the preset first jitter amplitude and the preset second jitter amplitude, respectively;

[0099] If the delay jitter amplitude of the BeiDou signal is greater than the preset first jitter amplitude and less than or equal to the preset second jitter amplitude, then it is determined that the disturbance waiting threshold needs to be increased.

[0100] If the delay jitter of the BeiDou signal is greater than the preset second jitter amplitude, then it is determined that there is no need to increase the disturbance waiting threshold.

[0101] Specifically, when the jitter amplitude of the BeiDou signal delay is greater than a preset first jitter amplitude but less than or equal to a preset second jitter amplitude, it is determined that the transmission effectiveness of the BeiDou signal does not meet the requirements because the disturbance waiting threshold does not meet the requirements, and therefore the disturbance waiting threshold needs to be increased. When the jitter amplitude of the BeiDou signal delay is greater than the preset second jitter amplitude, it can be preliminarily determined that the acquisition effectiveness of the BeiDou signal does not meet the requirements. Next, it is necessary to make a final determination on whether the acquisition effectiveness of the BeiDou signal meets the requirements based on the proportion of BeiDou satellite lock failure time per unit time, that is, to determine whether the reason for the non-compliance of the transmission effectiveness of the BeiDou signal is the non-compliance of the acquisition effectiveness of the BeiDou signal.

[0102] It is understandable that the preset first jitter amplitude is smaller than the preset second jitter amplitude, and the three intervals divided by the preset first jitter amplitude and the preset second jitter amplitude correspond to three different situations:

[0103] The first interval is when the delay jitter of the BeiDou signal is less than or equal to the preset first jitter amplitude. The corresponding situation is: the transmission validity of the BeiDou signal meets the requirements. At this time, it is necessary to further determine whether the density sensing coefficient of the neighboring terminal meets the requirements.

[0104] The second interval is when the BeiDou signal delay jitter is greater than the preset first jitter amplitude and less than or equal to the preset second jitter amplitude. The corresponding situation is: due to the atmospheric ionospheric disturbance caused by lightning during thunderstorms, the propagation speed and path of L-band signals will be temporarily changed, causing signal delay jitter and resulting in short message frame synchronization failure. At this time, it is necessary to adjust the disturbance waiting threshold.

[0105] The third interval is when the time delay jitter of the BeiDou signal is greater than the preset second jitter amplitude. The corresponding situation is that the glass curtain walls and metal structures of tall buildings in the city will reflect the satellite signal, forming a delayed multipath signal, which is superimposed on the direct signal at the receiving end, causing the signal amplitude to fluctuate, or even making it impossible to lock onto the satellite. At this time, it is necessary to further determine whether the acquisition effectiveness of the BeiDou signal meets the requirements.

[0106] Understandably, introducing preset first and second jitter amplitudes to characterize the transmission effectiveness of BeiDou signals is essentially a graded evaluation mechanism based on signal quality and propagation environment. This design overcomes the shortcomings of a single threshold in assessing signal quality under complex electromagnetic environments and achieves precise localization of time delay jitter issues and dynamic adaptation of corresponding processing strategies, ultimately meeting the dual requirements of signal reliability and stability in high-precision positioning scenarios. The core function of the preset first jitter amplitude is to provide a benchmark reference for signal quality monitoring in daily environments; the core function of the preset second jitter amplitude is to serve as a diagnostic threshold for determining whether severe interference has occurred leading to uncontrollable problems. The preset first and second jitter amplitudes can be set according to actual operating conditions. The setting of the preset first and second jitter amplitudes aims to ensure the transmission stability and practicality of BeiDou short message positioning information. Optionally, the preset first jitter amplitude and the preset second jitter amplitude are determined through a limited number of experiments by evaluating the effect of different time delay jitter amplitudes on the transmission of BeiDou short message positioning information. The determined preset first jitter amplitude and preset second jitter amplitude should satisfy the condition that they are neither too small nor cause excessive interference to the transmission process of BeiDou short message positioning information. For example, the preset first jitter amplitude is generally selected in the range of [1ns, 3ns], and the preset second jitter amplitude is generally selected in the range of [4ns, 6ns].

[0107] Preferably, the first jitter amplitude is 2ns in a preferred embodiment, and the second jitter amplitude is 5ns in a preferred embodiment.

[0108] Specifically, ns is the unit of time delay jitter amplitude of BeiDou signals, which means nanoseconds.

[0109] Specifically, the time delay jitter of BeiDou signals is the difference between the maximum and minimum delay of the BeiDou satellite signal received per unit time.

[0110] Specifically, the increase in the disturbance waiting threshold is determined by the difference between the time delay jitter amplitude of the BeiDou signal and the preset first jitter amplitude.

[0111] Specifically, when the difference between the BeiDou signal delay jitter amplitude and the preset first jitter amplitude is within 1 ns, the disturbance waiting threshold is increased to 1.1 times the original value. When the difference between the BeiDou signal delay jitter amplitude and the preset first jitter amplitude exceeds 1 ns, the disturbance waiting threshold is increased by 1 second for every 0.5 ns exceeding the original value, in addition to increasing to 1.1 times the original value. For example, when the difference between the BeiDou signal delay jitter amplitude and the preset first jitter amplitude is 2 ns, the current disturbance waiting threshold is 10 seconds, and the increased disturbance waiting threshold is 10 × 1.1 + 1 × 2 = 13 seconds.

[0112] In practice, the method of the present invention adjusts the disturbance waiting threshold by setting a preset first jitter amplitude and a preset second jitter amplitude. Since atmospheric ionospheric disturbances caused by lightning during thunderstorms can briefly change the propagation speed and path of L-band signals, causing signal delay jitter and resulting in short message frame synchronization failure, increasing the disturbance waiting threshold can extend the waiting time, allowing the terminal to miss the period of most severe ionospheric jitter during thunderstorms, reducing the probability of synchronization failure, increasing the transmission opportunity during stable periods, and further improving the transmission stability of BeiDou short message positioning information.

[0113] Please continue reading. Figure 4 The diagram shown is a logical flowchart of the determination of the signal integration time extension coefficient in the intelligent transmission method of Beidou short message positioning information based on multi-parameter fusion according to an embodiment of the present invention.

[0114] Specifically, the signal integral time extension coefficient is determined based on the proportion of time during which BeiDou satellite lock-on failures occur per unit time, including:

[0115] The percentage of time during which BeiDou satellite lock-on failures occurred within the specified unit of time was compared with a preset percentage of time.

[0116] If the percentage of BeiDou satellite lock failures per unit time is less than or equal to the preset percentage of time, then the effectiveness of BeiDou signal acquisition is determined to meet the requirements, and there is no need to increase the signal integration time extension coefficient. It is also determined whether the disturbance waiting threshold meets the requirements.

[0117] If the percentage of time during which BeiDou satellite lock-on fails is greater than the preset percentage, then the effectiveness of BeiDou signal acquisition is determined to be unsatisfactory, and the signal integration time extension coefficient needs to be increased.

[0118] Specifically, when the percentage of time during which BeiDou satellite lock-on fails is less than or equal to the preset percentage, it is determined that the acquisition effectiveness of the BeiDou signal meets the requirements. However, if the transmission effectiveness of the BeiDou signal has been determined to be unsatisfactory, it is necessary to further determine whether the disturbance waiting threshold meets the requirements.

[0119] In practice, the disturbance waiting threshold is determined to meet the requirements based on the comparison between the actual disturbance waiting threshold and the predetermined waiting threshold. If the actual disturbance waiting threshold is less than the predetermined waiting threshold, the disturbance waiting threshold is determined to not meet the requirements. The predetermined waiting threshold is the average value of the disturbance waiting thresholds monitored in the previous three months of the historical period.

[0120] If the actual disturbance waiting threshold does not meet the requirements, the actual disturbance waiting threshold is increased; if the actual disturbance waiting threshold meets the requirements, the delay jitter amplitude of the BeiDou signal is re-acquired, and the validity of the BeiDou signal transmission is re-evaluated.

[0121] When the proportion of BeiDou satellite lock failures per unit time is greater than the preset proportion, it can be determined that the reason why the transmission effectiveness of BeiDou signal does not meet the requirements is that the acquisition effectiveness of BeiDou signal does not meet the requirements. Therefore, it is necessary to increase the signal integration time extension coefficient.

[0122] It is understandable that the two preset time intervals correspond to two different scenarios:

[0123] The first interval is when the percentage of time during which BeiDou satellite lock-on failure is less than or equal to the preset percentage of time. The corresponding situation is: the effectiveness of BeiDou signal acquisition is determined to meet the requirements. At this time, it is necessary to further determine whether the disturbance waiting threshold meets the requirements.

[0124] The second interval is the situation where the percentage of BeiDou satellite lock failures per unit time is greater than the preset percentage. This is because the glass curtain walls and metal structures of tall buildings in the city reflect satellite signals, forming delayed multipath signals. These signals are superimposed on the direct signal at the receiving end, causing signal amplitude fluctuations and even making it impossible to lock onto the satellite. In this case, it is necessary to adjust the disturbance waiting threshold.

[0125] It is understandable that introducing a preset duration percentage to characterize the effectiveness of BeiDou signal acquisition during the transmission of BeiDou short message positioning information is essentially a graded evaluation mechanism based on signal locking stability and channel quality. This achieves precise identification of signal acquisition problems and the linkage of corresponding parameter adjustment strategies, ultimately meeting the dual requirements of signal persistence and stability in high-reliability positioning scenarios. The core function of the preset duration percentage is to provide a quantitative basis for judging whether the signal acquisition stage is subject to continuous interference, and to serve as a key decision parameter for triggering disturbance waiting threshold adjustments. The preset duration percentage can be set according to actual working conditions. The setting of the preset duration percentage aims to ensure the transmission stability and practicality of BeiDou short message positioning information. Optionally, the preset duration percentage is determined through a limited number of experiments by evaluating the effect of different lock-on failure duration percentages on the transmission of BeiDou short message positioning information. The determined preset duration percentage should be neither too small nor cause excessive interference to the transmission process of BeiDou short message positioning information. For example, the preset duration percentage is generally selected within the range of [4%, 6%].

[0126] Preferably, the preset duration percentage is 5% in the preferred embodiment.

[0127] Specifically, the percentage of time a BeiDou satellite fails to lock on is the ratio of the time a BeiDou satellite cannot establish a positioning lock state within a unit of time to the total unit of time.

[0128] Specifically, the increase in the signal integration time extension coefficient is determined by the difference between the percentage of BeiDou satellite lock failures per unit time and the preset percentage of such failures.

[0129] Specifically, when the difference between the percentage of BeiDou satellite lock failures per unit time and the preset percentage is within 2%, the signal integration time extension coefficient is increased to 1.2 times the original value. When the difference exceeds 2%, in addition to increasing to 1.2 times the original value, the signal integration time extension coefficient increases by 0.3 for every 1% exceeding the preset percentage. For example, when the difference between the percentage of BeiDou satellite lock failures per unit time and the preset percentage is 4%, the current signal integration time extension coefficient is 5, and the increased signal integration time extension coefficient is 5×1.2+0.3×2=6.6.

[0130] In practice, the method described in this invention adjusts the signal integration time extension coefficient by setting a preset duration ratio. Since glass curtain walls and metal structures of tall buildings in cities reflect satellite signals, forming delayed multipath signals, these signals are superimposed on the direct signal at the receiving end, causing signal amplitude fluctuations and even failure to lock onto the satellite. By increasing the signal integration time extension coefficient, satellite tracking interruptions caused by severe signal fluctuations can be reduced, the satellite locking failure rate can be lowered, thereby improving the satellite locking stability and further enhancing the transmission stability of BeiDou short message positioning information.

[0131] 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.

Claims

1. A method for intelligent transmission of BeiDou short message positioning information based on multi-parameter fusion, characterized in that, include: The collected multi-source data and positioning data are preprocessed to generate short message fused data, and the fused data is compressed and encrypted in sequence to form encrypted data; The encrypted data is transmitted to the receiving end via BeiDou satellite. The receiving end parses and restores the encrypted data to obtain the short message fusion data and performs corresponding processing. The transmission success rate of BeiDou short messages within a unit time is obtained, and the transmission stability of BeiDou short message positioning information is determined based on the transmission success rate of BeiDou short messages within the unit time. If the transmission stability of the BeiDou short message positioning information does not meet the requirements, then it is determined whether it is necessary to increase the density sensing coefficient of the neighboring terminals. If it is not necessary to increase the density sensing coefficient of neighboring terminals, then obtain the delay jitter amplitude of the BeiDou signal to determine whether the transmission effectiveness of the BeiDou signal meets the requirements; If the transmission validity of the BeiDou signal does not meet the requirements, then determine whether it is necessary to increase the disturbance waiting threshold; If it is not necessary to increase the disturbance waiting threshold, the signal integration time extension coefficient is determined based on the proportion of BeiDou satellite lock failure time per unit time. The transmission success rate of BeiDou short messages per unit time is compared with a preset second success rate. If the transmission success rate of BeiDou short messages within the unit time is greater than the preset second success rate, then the transmission stability of BeiDou short message positioning information is determined to meet the requirements. If the transmission success rate of BeiDou short messages within the unit time is less than or equal to the preset second success rate, then it is determined that the transmission stability of BeiDou short message positioning information does not meet the requirements. The transmission success rate of BeiDou short messages per unit time is compared with the preset first success rate and the preset second success rate, respectively. If the transmission success rate of BeiDou short messages per unit time is less than or equal to the preset first success rate, then it is determined that the density sensing coefficient of neighboring terminals needs to be increased. If the transmission success rate of BeiDou short messages per unit time is greater than the preset first success rate and less than or equal to the preset second success rate, then it is determined that there is no need to increase the neighboring terminal density sensing coefficient. The time delay jitter amplitude of the BeiDou signal is compared with a preset first jitter amplitude; If the delay jitter amplitude of the BeiDou signal is less than or equal to the preset first jitter amplitude, then it is determined that the transmission validity of the BeiDou signal meets the requirements, and it is determined whether the neighboring terminal density sensing coefficient meets the requirements. If the delay jitter of the BeiDou signal is greater than the preset first jitter amplitude, then the transmission validity of the BeiDou signal is determined to be unsatisfactory. The time delay jitter amplitude of the BeiDou signal is compared with the preset first jitter amplitude and the preset second jitter amplitude, respectively; If the delay jitter amplitude of the BeiDou signal is greater than the preset first jitter amplitude and less than or equal to the preset second jitter amplitude, then it is determined that the disturbance waiting threshold needs to be increased. If the delay jitter amplitude of the BeiDou signal is greater than the preset second jitter amplitude, then it is determined that there is no need to increase the disturbance waiting threshold. The percentage of time during which BeiDou satellite lock-on failures occurred within the specified unit of time was compared with a preset percentage of time. If the percentage of BeiDou satellite lock failures per unit time is less than or equal to the preset percentage of time, then the effectiveness of BeiDou signal acquisition is determined to meet the requirements, and there is no need to increase the signal integration time extension coefficient. It is also determined whether the disturbance waiting threshold meets the requirements. If the percentage of BeiDou satellite lock failures per unit time is greater than the preset percentage, then the effectiveness of BeiDou signal acquisition is determined to be unsatisfactory, and the signal integration time extension coefficient needs to be increased.

2. The intelligent transmission method for BeiDou short message positioning information based on multi-parameter fusion according to claim 1, characterized in that, The increase in the neighborhood terminal density sensing coefficient is determined by the difference between the preset first success rate and the transmission success rate of BeiDou short messages per unit time.

3. The intelligent transmission method for BeiDou short message positioning information based on multi-parameter fusion according to claim 2, characterized in that, The increase in the disturbance waiting threshold is determined by the difference between the time delay jitter amplitude of the BeiDou signal and the preset first jitter amplitude.

4. The intelligent transmission method for BeiDou short message positioning information based on multi-parameter fusion according to claim 3, characterized in that, The percentage of time during which BeiDou satellites fail to lock on is the ratio of the total time during which BeiDou satellites cannot successfully establish a positioning lock state to the unit time.

5. The intelligent transmission method for BeiDou short message positioning information based on multi-parameter fusion according to claim 4, characterized in that, The increase in the signal integration time extension coefficient is determined by the difference between the percentage of BeiDou satellite lock failures per unit time and the preset percentage of such failures.

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