Beidou positioning information transmission system and method based on distributed base stations in tunnels

Abstract

The application relates to the technical field of data communication, in particular to a Beidou positioning information transmission system and method based on distributed base stations in a tunnel. The method sets a plurality of Beidou positioning base stations in the tunnel, uses an intelligent networking algorithm to connect the Beidou positioning base stations to form a network topology structure, sequentially cleans and filters positioning data from the plurality of Beidou positioning base stations to output optimized data, determines whether the transmission stability of the positioning information meets the requirements through an abnormal difference of the voltage of the Beidou positioning base station, adjusts the working mode of a fault Beidou positioning base station, and determines whether the effectiveness of the intelligent networking meets the requirements based on the transmission delay time length of the optimized data, so that the problem that the positioning information transmission accuracy is low due to the decline of the transmission stability of the positioning information caused by the fact that the power supply interface of the base station equipment is loose, the contact is poor, and the equipment cannot normally work is overcome.

Description

Technical Field

[0001] This invention relates to the field of data communication technology, and in particular to a BeiDou positioning information transmission system and method based on distributed base stations in tunnels. Background Technology

[0002] In existing technologies, with the continuous advancement of infrastructure construction, tunnels, as a key component of transportation networks, are increasingly widely used in highways, railways, and other fields. Due to the enclosed environment inside tunnels, satellite signals have difficulty penetrating them directly, posing a significant challenge to traditional satellite-based positioning technologies. Positioning accuracy and reliability have decreased significantly, failing to meet the needs of personnel and vehicle positioning and equipment monitoring within tunnels. However, the demand for high-precision positioning information is extremely urgent during tunnel construction, operation, and maintenance. For example, during tunnel construction, construction workers need to know their real-time location to rationally plan construction tasks and avoid safety accidents; during tunnel operation, accurate positioning of passing vehicles can help traffic management departments optimize traffic flow, promptly handle emergencies, and ensure traffic safety within the tunnel.

[0003] The BeiDou Navigation Satellite System, my country's independently developed global satellite navigation system, boasts advantages such as wide coverage, high positioning accuracy, and precise timing, providing a new solution for positioning within tunnels. By strategically placing BeiDou positioning base stations within tunnels, relay transmission of satellite signals can be achieved, overcoming the limitation that satellite signals cannot directly penetrate tunnels. However, the unique environment within tunnels, such as complex terrain, strong electromagnetic interference, and multiple signal reflections and scattering, presents numerous challenges to the networking of BeiDou positioning base stations and the transmission of positioning information.

[0004] Chinese Patent Publication No. CN117354711A discloses a method and system for high-precision positioning data processing of pontoon bridges based on BeiDou and ad hoc networks. The method includes the following steps: acquiring corresponding observations based on the measurement time, and temporarily latching the observations according to sub-times of the measurement time to obtain an observation set about the measurement time; using an observation pre-detection method to detect the observation set to obtain valid observations; solving the PVT start-up based on the valid observations and refining it to obtain the PVT result; using a post-processing algorithm to filter the PVT result to obtain a filtered PVT result; updating navigation information based on the filtered PVT result; reading the observation data corresponding to the valid observations, preprocessing the observation data to obtain clean observations, and establishing an observation database; constructing a double-difference observation equation based on the clean observations, and solving the double-difference observation equation in combination with pre-set initialization information, control parameter set, and constraint conditions to obtain position data and azimuth data; and outputting the position data and azimuth data to a visualization terminal.

[0005] It is evident that existing technologies suffer from drawbacks such as loosening of the power interface of base station equipment due to prolonged use, resulting in poor contact, malfunction of the equipment, decreased stability of positioning information transmission, and low accuracy of positioning information transmission. Summary of the Invention

[0006] To address this issue, the present invention provides a BeiDou positioning information transmission system and method based on distributed base stations within tunnels, thereby overcoming the problem in the prior art that the power interface of the base station equipment may become loose due to prolonged use, resulting in poor contact, which in turn causes the equipment to malfunction and thus reduces the stability of positioning information transmission, leading to low accuracy of positioning information transmission.

[0007] To achieve the above objectives, the present invention provides a method for transmitting BeiDou positioning information based on distributed base stations within tunnels, comprising:

[0008] Several BeiDou positioning base stations are set up inside the tunnel, and intelligent networking algorithms are used to connect the several BeiDou positioning base stations to form a network topology in order to obtain the positioning data of each BeiDou positioning base station.

[0009] Positioning data from several BeiDou positioning base stations are sequentially cleaned, filtered, and fused, and optimized data is output and transmitted to the user terminal.

[0010] Obtain the operating voltage of the BeiDou positioning base station;

[0011] The abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is used to determine whether the transmission stability of the positioning information meets the requirements.

[0012] If the transmission stability does not meet the requirements, then it is determined that the working mode of the faulty Beidou positioning base station should be adjusted; or, it is determined whether the effectiveness of intelligent networking is met based on the transmission delay time of the optimized data.

[0013] If the validity requirement is not met, then the bit error rate threshold of the BeiDou positioning base station is adjusted; or, the transmit power control step size of the BeiDou positioning base station is adjusted based on the carrier-to-noise ratio of the BeiDou signal.

[0014] Preferably, the process of determining the transmission stability of the positioning information includes:

[0015] The abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is compared with the preset first abnormal difference.

[0016] If the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is greater than the preset first abnormal difference, then the transmission stability of the positioning information is determined to be unsatisfactory.

[0017] Preferably, the process of determining the effectiveness of the intelligent network includes:

[0018] The abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is compared with the preset first abnormal difference and the preset second abnormal difference, respectively.

[0019] If the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is greater than the preset first abnormal difference and less than or equal to the preset second abnormal difference, it is preliminarily determined that the effectiveness of the intelligent networking does not meet the requirements, and the effectiveness of the intelligent networking is determined based on the transmission delay of the optimized data.

[0020] Preferably, the process of adjusting the working mode of the faulty BeiDou positioning base station includes:

[0021] The abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is compared with the preset second abnormal difference.

[0022] If the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is greater than the preset second abnormal difference, then the operating mode of the faulty Beidou positioning base station will be adjusted.

[0023] Preferably, adjusting the working mode of the faulty Beidou positioning base station involves changing the high-precision positioning mode to a low-power positioning mode.

[0024] Preferably, the process of adjusting the bit error rate threshold of the BeiDou positioning base station includes:

[0025] The optimized data transmission delay duration is compared with the preset first delay duration and the preset second delay duration, respectively;

[0026] If the transmission delay of the optimized data is greater than the preset first delay, then the effectiveness of the intelligent networking is determined to be unsatisfactory.

[0027] If the transmission delay of the optimized data is greater than the preset first delay and less than or equal to the preset second delay, then the bit error rate threshold of the Beidou positioning base station is increased.

[0028] If the transmission delay of the optimized data is longer than the preset second delay, it is initially determined that the transmission stability of the BeiDou signal does not meet the requirements, and the transmission stability of the BeiDou signal is determined based on the carrier-to-noise ratio of the BeiDou signal.

[0029] Preferably, the increase in the bit error rate threshold of the Beidou positioning base station is determined by optimizing the difference between the data transmission delay and the preset first delay.

[0030] Preferably, the process of adjusting the control step size of the transmission power of the Beidou positioning base station includes:

[0031] The carrier-to-noise ratio of the BeiDou signal is compared with the preset carrier-to-noise ratio;

[0032] If the carrier-to-noise ratio of the BeiDou signal is less than or equal to the preset carrier-to-noise ratio, it is determined that the transmission stability of the BeiDou signal does not meet the requirements, and the control step size of the transmission power of the BeiDou positioning base station is increased.

[0033] The increment of the transmission power control step size for BeiDou positioning base stations is determined by the difference between the preset carrier-to-noise ratio and the carrier-to-noise ratio of the BeiDou signal.

[0034] Preferably, the ratio of carrier power to noise power in the BeiDou signal is determined as the carrier-to-noise ratio of the BeiDou signal.

[0035] This invention also provides a BeiDou positioning information transmission system based on distributed base stations within tunnels, comprising:

[0036] The data acquisition unit includes setting up several BeiDou positioning base stations in the tunnel, using an intelligent networking algorithm to connect the several BeiDou positioning base stations to form a network topology, and acquiring the positioning data of each BeiDou positioning base station.

[0037] The processing unit is connected to the data acquisition unit to acquire positioning data from each BeiDou positioning base station; and sequentially cleans, filters, and fuses the positioning data from several BeiDou positioning base stations, outputs optimized data, and transmits the optimized data to the user terminal.

[0038] An information receiving unit is connected to the processing unit and the user terminal respectively, and is used to obtain the operating voltage of the Beidou positioning base station;

[0039] The control unit is connected to the data acquisition unit, the processing unit and the information receiving unit respectively, and is used to determine whether the transmission stability of the positioning information meets the requirements based on the abnormal difference between the actual working voltage and the standard voltage of the Beidou positioning base station.

[0040] Used to determine whether to adjust the working mode of the faulty Beidou positioning base station when the transmission stability does not meet the requirements; or to determine whether the effectiveness of intelligent networking meets the requirements based on the transmission delay time of optimized data.

[0041] Used to determine, when the validity does not meet the requirements, to adjust the bit error rate threshold of the BeiDou positioning base station; or to determine to adjust the transmit power control step size of the BeiDou positioning base station based on the carrier-to-noise ratio of the BeiDou signal.

[0042] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention provides a method for transmitting BeiDou positioning information based on distributed base stations within a tunnel. By setting up several BeiDou positioning base stations within the tunnel and connecting them using an intelligent networking algorithm to form a network topology, positioning data from each BeiDou positioning base station is acquired. The positioning data from these base stations is then sequentially cleaned, filtered, and fused, and optimized data is output and transmitted to the user terminal. The method adjusts the operating mode of faulty BeiDou positioning base stations based on the abnormal difference between the actual operating voltage and the standard voltage. This reduces the likelihood of loose power interfaces causing poor contact and malfunctions due to prolonged use. Adjusting the operating mode of faulty BeiDou positioning base stations can reduce operating frequency or suspend some non-critical operations, thereby reducing overall power consumption and adapting to unstable power supply conditions. The method also adjusts the BeiDou positioning information transmission mode based on the transmission delay of the optimized data. The bit error rate threshold of the BeiDou positioning base station is adjusted. Because tunnels can be long, limiting the bandwidth of the communication network, and multi-base station fusion requires the transmission of large amounts of positioning data and control information, data congestion can easily occur, leading to data transmission delays, packet loss, and other problems, affecting the collaborative work between multiple base stations. Increasing the bit error rate threshold of the BeiDou positioning base station avoids frequent error correction and retransmissions due to an excessive pursuit of data transmission accuracy, thereby reducing the additional data volume caused by error correction and retransmissions and alleviating network congestion. The transmission power control step size of the BeiDou positioning base station is adjusted according to the carrier-to-noise ratio of the BeiDou signal. Since the terrain where the tunnel is located may vary in height, the BeiDou signal strength weakens during transmission, leading to a decrease in signal quality. Increasing the transmission power control step size of the BeiDou positioning base station allows for a faster increase in transmission power, helping to compensate for signal attenuation caused by mountain obstruction and allowing the signal strength to recover to a reasonable level more quickly, thus improving signal quality and enhancing the stability of positioning information transmission.

[0043] Furthermore, the method of the present invention adjusts the working mode of the faulty Beidou positioning base station by setting a preset first abnormal difference amount and a preset second abnormal difference amount. Due to long-term use, the power interface of the base station equipment becomes loose, resulting in poor contact and causing the equipment to fail to work properly. By adjusting the working mode of the faulty Beidou positioning base station, the working frequency can be reduced or some non-critical operations can be suspended to reduce overall power consumption and adapt to the situation of unstable power supply, thereby further improving the transmission stability of positioning information.

[0044] Furthermore, the method of the present invention adjusts the bit error rate threshold of the BeiDou positioning base station by setting a preset first delay duration and a preset second delay duration. Since the tunnel may be long, resulting in limited transmission bandwidth of the communication network, and the fusion of multiple base stations requires the transmission of a large amount of positioning data, control information, etc., it is easy to cause data congestion, leading to problems such as data transmission delay and packet loss, which affects the collaborative work between multiple base stations. By increasing the bit error rate threshold of the BeiDou positioning base station, frequent error correction and retransmission can be avoided due to excessive pursuit of data transmission accuracy, thereby reducing the amount of extra data caused by error correction and retransmission, alleviating network congestion, and further improving the transmission stability of positioning information.

[0045] Furthermore, the method described in this invention adjusts the control step size of the transmission power of the BeiDou positioning base station by setting a preset carrier-to-noise ratio. Since the mountain where the tunnel is located may have different elevations, the BeiDou signal strength weakens during transmission, resulting in a decrease in signal quality. By increasing the control step size of the transmission power of the BeiDou positioning base station, the base station's transmission power can be increased more quickly, which helps to compensate for the signal attenuation caused by the mountain's obstruction in a timely manner, allowing the signal strength to recover to a reasonable level more quickly, thereby improving signal quality and further enhancing the transmission stability of positioning information. Attached Figure Description

[0046] Figure 1 This is a flowchart illustrating the steps of a BeiDou positioning information transmission method based on a distributed base station within a tunnel, according to an embodiment of the present invention.

[0047] Figure 2 This is a flowchart illustrating the logical determination of whether the transmission stability of location information conforms to the standard in an embodiment of the present invention.

[0048] Figure 3 This is a flowchart illustrating the logical determination process for whether the effectiveness of intelligent networking meets the requirements in an embodiment of the present invention.

[0049] Figure 4 This is a structural block diagram of a BeiDou positioning information transmission system based on a distributed base station in a tunnel, according to an embodiment of the present invention. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] Please see Figure 1 The figures shown are flowcharts illustrating the steps of a BeiDou positioning information transmission method based on a distributed base station within a tunnel, according to an embodiment of the present invention. The present invention provides a BeiDou positioning information transmission method based on a distributed base station within a tunnel, comprising:

[0054] Step S1: Set up several BeiDou positioning base stations in the tunnel, and use an intelligent networking algorithm to connect the several BeiDou positioning base stations to form a network topology in order to obtain the positioning data of each BeiDou positioning base station.

[0055] Step S2: The positioning data from several Beidou positioning base stations are sequentially cleaned, filtered, and fused, and optimized data is output and transmitted to the user terminal.

[0056] Step S3: Obtain the operating voltage of the Beidou positioning base station;

[0057] Step S4: Determine whether the transmission stability of positioning information meets the requirements based on the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station.

[0058] If the transmission stability does not meet the requirements, then it is determined that the working mode of the faulty Beidou positioning base station should be adjusted; or, it is determined whether the effectiveness of intelligent networking is met based on the transmission delay time of the optimized data.

[0059] If the validity requirement is not met, then the bit error rate threshold of the BeiDou positioning base station is adjusted; or, the transmit power control step size of the BeiDou positioning base station is adjusted based on the carrier-to-noise ratio of the BeiDou signal.

[0060] Specifically, intelligent networking algorithms include minimum spanning tree algorithm, distributed topology control algorithm, and ant colony algorithm.

[0061] Specifically, the positioning data includes three-dimensional coordinate data, positioning time, and satellite number.

[0062] Specifically, the optimized data includes data whose coordinate values ​​exceed the tunnel's range, smoothed 3D coordinate data, and improved position coordinates.

[0063] In implementation, the method of this invention adjusts the operating mode of a faulty BeiDou positioning base station based on the abnormal difference between the actual operating voltage and the standard voltage of the BeiDou positioning base station. Prolonged use can cause the power interface of the base station equipment to become loose, resulting in poor contact and preventing the equipment from functioning properly. By adjusting the operating mode of the faulty BeiDou positioning base station, the operating frequency can be reduced or some non-critical operations can be suspended to reduce overall power consumption and adapt to unstable power supply conditions. The bit error rate threshold of the BeiDou positioning base station is adjusted based on the optimized data transmission delay. Since tunnels may be long, resulting in limited communication network bandwidth, and multi-base station fusion requires the transmission of large amounts of positioning data and control information, data congestion can easily occur, leading to data transmission delays, packet loss, and other problems. The problem is that the error rate threshold of the BeiDou positioning base station affects the coordinated operation between multiple base stations. By increasing the error rate threshold of the BeiDou positioning base station, frequent error correction and retransmission can be avoided due to the excessive pursuit of data transmission accuracy. This reduces the amount of extra data caused by error correction and retransmission, alleviating network congestion. The step size of the transmission power control of the BeiDou positioning base station is adjusted according to the carrier-to-noise ratio of the BeiDou signal. Since the mountain where the tunnel is located may have different elevations, the BeiDou signal strength may weaken during transmission, resulting in a decrease in signal quality. By increasing the step size of the transmission power control of the BeiDou positioning base station, the transmission power of the base station can be increased more quickly, which helps to compensate for the signal attenuation caused by the mountain obstruction in a timely manner, allowing the signal strength to recover to a reasonable level more quickly, thereby improving signal quality and enhancing the transmission stability of positioning information.

[0064] Please see Figure 2 As shown, this is a flowchart illustrating the logical determination of whether the transmission stability of location information meets the standard according to an embodiment of the present invention. The process of determining whether the transmission stability of the location information meets the requirements includes:

[0065] The operating voltage of the Beidou positioning base station is obtained per unit time, and the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is calculated.

[0066] The abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is compared with a preset first abnormal difference.

[0067] If the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is less than or equal to the preset first abnormal difference, then the transmission stability of the positioning information is determined to meet the requirements.

[0068] If the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is greater than the preset first abnormal difference, then the transmission stability of the positioning information is determined to be unsatisfactory.

[0069] Please see Figure 3The diagram shown is a flowchart illustrating the logical determination process for whether the effectiveness of intelligent networking meets the requirements in an embodiment of the present invention. The process for determining whether the effectiveness of intelligent networking meets the requirements in this invention includes:

[0070] The intelligent networking algorithm is used to connect the several BeiDou positioning base stations to form a network topology.

[0071] The abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is compared with the preset first abnormal difference and the preset second abnormal difference, respectively.

[0072] If the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is greater than the preset first abnormal difference and less than or equal to the preset second abnormal difference, it is preliminarily determined that the effectiveness of the intelligent networking does not meet the requirements, and the effectiveness of the intelligent networking is determined based on the transmission delay of the optimized data.

[0073] It is understandable that the three intervals defined by the preset first abnormal difference value and the preset second abnormal difference value correspond to three different situations:

[0074] The first interval is when the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is less than or equal to the preset first abnormal difference amount. The corresponding situation is: the transmission stability of the positioning information meets the requirements.

[0075] The second interval is when the abnormal difference between the actual working voltage and the standard voltage of the Beidou positioning base station is greater than the preset first abnormal difference and less than or equal to the preset second abnormal difference. The corresponding situation is: due to the tunnel being long, the communication network transmission bandwidth is limited. The fusion of multiple base stations requires the transmission of a large amount of positioning data, control information, etc., which can easily cause data congestion, resulting in data transmission delay, packet loss and other problems, affecting the collaborative work between multiple base stations.

[0076] The third interval is when the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is greater than the preset second abnormal difference. The corresponding situation is that the power interface of the base station equipment has become loose due to long-term use, resulting in poor contact and thus abnormal operating voltage.

[0077] During implementation, when the Beidou positioning base station is operating inside the tunnel, the preset range for the first abnormal difference is [9V, 11V], and the preset range for the second abnormal difference is [12V, 14V].

[0078] Preferably, the first abnormal difference value is 10V in a preferred embodiment, and the second abnormal difference value is 13V in a preferred embodiment.

[0079] Specifically, the abnormal difference between the actual operating voltage and the standard voltage of a Beidou positioning base station is the difference between the actual operating voltage when an anomaly occurs and the normal operating voltage when no anomaly occurs.

[0080] Specifically, the operating voltage of BeiDou positioning base stations is direct current.

[0081] Specifically, the signal transmission module in a BeiDou positioning base station requires a stable voltage to provide accurate operating power. When the abnormal difference in operating voltage is too large, the output power of the transmission module will also change significantly, thus affecting the stability of the positioning information transmission.

[0082] In practice, the method of the present invention determines the transmission stability of positioning information by setting a preset first abnormal difference amount and a preset second abnormal difference amount, thereby reducing the impact of the decrease in the transmission accuracy of positioning information due to the inaccuracy in determining the transmission stability of positioning information, and further improving the transmission stability of positioning information.

[0083] Specifically, the process of adjusting the working mode of the faulty BeiDou positioning base station according to the present invention includes:

[0084] The abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is compared with the preset second abnormal difference.

[0085] If the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is greater than the preset second abnormal difference, then the operating mode of the faulty Beidou positioning base station will be adjusted.

[0086] Specifically, the working mode of the faulty Beidou positioning base station is changed from high-precision positioning mode to low-power positioning mode.

[0087] In practice, the method of the present invention adjusts the working mode of the faulty Beidou positioning base station by setting a preset first abnormal difference amount and a preset second abnormal difference amount. Due to long-term use, the power interface of the base station equipment becomes loose, resulting in poor contact and causing the equipment to malfunction. By adjusting the working mode of the faulty Beidou positioning base station, the working frequency can be reduced or some non-critical operations can be suspended to reduce overall power consumption and adapt to the unstable power supply, thereby further improving the transmission stability of positioning information.

[0088] Specifically, the process of adjusting the bit error rate threshold of the BeiDou positioning base station includes:

[0089] Obtain the transmission latency of the optimized data;

[0090] The transmission delay of the optimized data is compared with a preset first delay and a preset second delay, respectively.

[0091] If the transmission delay of the optimized data is greater than the preset first delay, then the effectiveness of the intelligent networking is determined to be unsatisfactory.

[0092] If the transmission delay of the optimized data is greater than the preset first delay and less than or equal to the preset second delay, then the bit error rate threshold of the Beidou positioning base station is increased.

[0093] If the transmission delay of the optimized data is longer than the preset second delay, it is initially determined that the transmission stability of the BeiDou signal does not meet the requirements, and the transmission stability of the BeiDou signal is determined based on the carrier-to-noise ratio of the BeiDou signal.

[0094] It is understandable that the three intervals divided by the preset first delay duration and the preset second delay duration correspond to three different scenarios:

[0095] The first interval is when the transmission delay of optimized data is less than or equal to the preset first delay time, which corresponds to the situation where the effectiveness of intelligent networking is determined to meet the requirements.

[0096] The second interval is where the data transmission delay is greater than the preset first delay and less than or equal to the preset second delay. The corresponding situation is that the tunnel may be long, resulting in limited communication network transmission bandwidth. Multi-base station fusion requires the transmission of a large amount of positioning data, control information, etc., which can easily cause data congestion, leading to data transmission delay, packet loss and other problems, affecting the collaborative work between multiple base stations.

[0097] The third interval is when the transmission delay of the optimized data is longer than the preset second delay. The corresponding situation is that the Beidou signal strength weakens during transmission due to the different elevations of the mountain where the tunnel is located, resulting in a decrease in signal quality.

[0098] In implementation, the preset first delay duration is selected in the range of [70ms, 90ms], and the preset second delay duration is selected in the range of [95ms, 105ms].

[0099] Preferably, the first preset delay duration is 80ms in a preferred embodiment, and the second preset delay duration is 100ms in a preferred embodiment.

[0100] In practice, the method of the present invention determines the effectiveness of intelligent networking by setting a preset first delay duration and a preset second delay duration, thereby reducing the impact of inaccurate determination of the effectiveness of intelligent networking leading to a decrease in the transmission stability of positioning information and further improving the transmission stability of positioning information.

[0101] Specifically, the increase in the bit error rate threshold of the Beidou positioning base station is determined by the difference between the optimized data transmission delay and the preset first delay.

[0102] Specifically, when the difference between the optimized data transmission delay and the preset first delay is within 20ms, the bit error rate threshold of the BeiDou positioning base station is increased to 1.1 times the original value; when the difference exceeds 20ms, in addition to increasing to 1.1 times the original value, the bit error rate threshold of the BeiDou positioning base station increases by 10 times for every 5ms exceeding the original value. -7 For example, the difference between the optimized data transmission delay and the preset first delay is 30ms, and the current error rate threshold of the BeiDou positioning base station is 10. -6 The increased bit error rate threshold for BeiDou positioning base stations is 10. -6 ×1.1+10 -7 ×2=1.3×10 -6 .

[0103] In practice, the method of the present invention adjusts the bit error rate threshold of the Beidou positioning base station by setting a preset first delay duration and a preset second delay duration. Since the tunnel may be long, resulting in limited transmission bandwidth of the communication network, and the fusion of multiple base stations requires the transmission of a large amount of positioning data, control information, etc., it is easy to cause data congestion, leading to problems such as data transmission delay and packet loss, which affects the collaborative work between multiple base stations. By increasing the bit error rate threshold of the Beidou positioning base station, frequent error correction and retransmission can be avoided due to excessive pursuit of data transmission accuracy, thereby reducing the amount of extra data caused by error correction and retransmission, alleviating network congestion, and further improving the transmission stability of positioning information.

[0104] Specifically, the process of adjusting the transmission power control step size of the BeiDou positioning base station includes:

[0105] The carrier power and noise power in the BeiDou signal are obtained separately, and the carrier-to-noise ratio of the BeiDou signal is calculated.

[0106] The carrier-to-noise ratio of the BeiDou signal is compared with a preset carrier-to-noise ratio;

[0107] If the carrier-to-noise ratio of the BeiDou signal is less than or equal to the preset carrier-to-noise ratio, it is determined that the transmission stability of the BeiDou signal does not meet the requirements, and the control step size of the transmission power of the BeiDou positioning base station is increased.

[0108] It is understandable that the two intervals of the preset carrier-to-noise ratio correspond to two different situations:

[0109] The first interval is when the carrier-to-noise ratio of the BeiDou signal is less than or equal to the preset carrier-to-noise ratio. The corresponding situation is that the mountain where the tunnel is located may have different elevations, which causes the BeiDou signal strength to weaken during transmission, resulting in a decrease in signal quality.

[0110] The second interval is when the carrier-to-noise ratio of the BeiDou signal is greater than the preset carrier-to-noise ratio, which corresponds to the situation where the transmission stability of the BeiDou signal meets the requirements.

[0111] In practice, the preset carrier-to-noise ratio is obtained in advance and the selected range is [40dB, 50dB].

[0112] Preferably, the preset carrier-to-noise ratio is 45dB in the preferred embodiment.

[0113] In practice, the method of the present invention determines the transmission stability of BeiDou signals by setting a preset carrier-to-noise ratio, thereby reducing the impact of inaccurate determination of the transmission stability of BeiDou signals on the transmission stability of positioning information and further improving the transmission stability of positioning information.

[0114] Specifically, the carrier-to-noise ratio of the BeiDou signal is the ratio of carrier power to noise power in the BeiDou signal.

[0115] Specifically, the increase in the transmission power control step size of the BeiDou positioning base station is determined by the difference between the preset carrier-to-noise ratio and the carrier-to-noise ratio of the BeiDou signal.

[0116] Specifically, when the difference between the preset carrier-to-noise ratio (CNR) and the CNR of the BeiDou signal is within 5dB, the transmission power control step size of the BeiDou positioning base station is increased to 1.2 times the original value. When the difference between the preset CNR and the CNR of the BeiDou signal exceeds 5dB, in addition to increasing to 1.2 times the original value, the transmission power control step size of the BeiDou positioning base station is increased by 0.2dB for every 3dB increase. For example, if the difference between the preset CNR and the CNR of the BeiDou signal is 11dB, and the current transmission power control step size of the BeiDou positioning base station is 3dB, the increased transmission power control step size of the BeiDou positioning base station will be 3×1.2+0.2×2=4dB.

[0117] In practice, the method described in this invention adjusts the control step size of the transmission power of the BeiDou positioning base station by setting a preset carrier-to-noise ratio. Since the mountain where the tunnel is located may have different elevations, the BeiDou signal strength weakens during transmission, resulting in a decrease in signal quality. By increasing the control step size of the transmission power of the BeiDou positioning base station, the base station's transmission power can be increased more quickly, which helps to compensate for the signal attenuation caused by the mountain's obstruction in a timely manner, allowing the signal strength to recover to a reasonable level more quickly, thereby improving signal quality and further enhancing the transmission stability of positioning information.

[0118] Please see Figure 4The diagram shown is a structural block diagram of a BeiDou positioning information transmission system based on a distributed base station within a tunnel, according to an embodiment of the present invention. The present invention also provides a BeiDou positioning information transmission system based on a distributed base station within a tunnel, comprising:

[0119] The data acquisition unit includes setting up several BeiDou positioning base stations in the tunnel, using an intelligent networking algorithm to connect the several BeiDou positioning base stations to form a network topology, and acquiring the positioning data of each BeiDou positioning base station.

[0120] The processing unit is connected to the data acquisition unit to acquire positioning data from each BeiDou positioning base station; and sequentially cleans, filters, and fuses the positioning data from several BeiDou positioning base stations, outputs optimized data, and transmits the optimized data to the user terminal.

[0121] An information receiving unit is connected to the processing unit and the user terminal respectively, and is used to obtain the operating voltage of the Beidou positioning base station;

[0122] The control unit is connected to the data acquisition unit, the processing unit and the information receiving unit respectively, and is used to determine whether the transmission stability of the positioning information meets the requirements based on the abnormal difference between the actual working voltage and the standard voltage of the Beidou positioning base station.

[0123] Used to determine whether to adjust the working mode of the faulty Beidou positioning base station when the transmission stability does not meet the requirements; or to determine whether the effectiveness of intelligent networking meets the requirements based on the transmission delay time of optimized data.

[0124] Used to determine, when the validity does not meet the requirements, to adjust the bit error rate threshold of the BeiDou positioning base station; or to determine to adjust the transmit power control step size of the BeiDou positioning base station based on the carrier-to-noise ratio of the BeiDou signal.

[0125] 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 transmitting BeiDou positioning information based on distributed base stations within a tunnel, characterized in that, include: Several BeiDou positioning base stations are set up inside the tunnel, and intelligent networking algorithms are used to connect the several BeiDou positioning base stations to form a network topology in order to obtain the positioning data of each BeiDou positioning base station. Positioning data from several BeiDou positioning base stations are sequentially cleaned, filtered, and fused, and optimized data is output and transmitted to the user terminal. Obtain the operating voltage of the BeiDou positioning base station; The stability of positioning information transmission is determined based on the abnormal difference between the actual operating voltage and the standard voltage of the BeiDou positioning base station. If the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is greater than the preset first abnormal difference and less than or equal to the preset second abnormal difference, it is preliminarily determined that the effectiveness of the intelligent networking does not meet the requirements, and the effectiveness of the intelligent networking is determined based on the transmission delay of the optimized data. If the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is greater than the preset second abnormal difference, then the operating mode of the faulty Beidou positioning base station will be adjusted. Among these, determining whether the effectiveness of intelligent networking meets the requirements is based on optimizing the data transmission delay duration. If the transmission delay of the optimized data is greater than the preset first delay duration, then the effectiveness of the intelligent networking is determined to be unsatisfactory. If the transmission delay of the optimized data is greater than a preset first delay and less than or equal to a preset second delay, then the bit error rate threshold of the Beidou positioning base station is increased. If the transmission delay of the optimized data is longer than the preset second delay, it is initially determined that the transmission stability of the BeiDou signal does not meet the requirements. The transmission stability of the BeiDou signal is then determined based on the carrier-to-noise ratio of the BeiDou signal. Additionally, the transmission power control step size of the BeiDou positioning base station is adjusted based on the carrier-to-noise ratio of the BeiDou signal.

2. The method for transmitting BeiDou positioning information based on distributed base stations within a tunnel according to claim 1, characterized in that, Adjust the working mode of the faulty Beidou positioning base station to change from high-precision positioning mode to low-power positioning mode.

3. The method for transmitting BeiDou positioning information based on a distributed base station within a tunnel according to claim 2, characterized in that, The increase in the bit error rate threshold of Beidou positioning base stations is determined by optimizing the difference between the data transmission delay and the preset first delay.

4. The method for transmitting BeiDou positioning information based on a distributed base station within a tunnel according to claim 3, characterized in that, The process of adjusting the control step size of the transmission power of BeiDou positioning base stations includes: The carrier-to-noise ratio of the BeiDou signal is compared with the preset carrier-to-noise ratio; If the carrier-to-noise ratio of the BeiDou signal is less than or equal to the preset carrier-to-noise ratio, it is determined that the transmission stability of the BeiDou signal does not meet the requirements, and the control step size of the transmission power of the BeiDou positioning base station is increased. The increment of the transmission power control step size for BeiDou positioning base stations is determined by the difference between the preset carrier-to-noise ratio and the carrier-to-noise ratio of the BeiDou signal.

5. The method for transmitting BeiDou positioning information based on a distributed base station within a tunnel according to claim 4, characterized in that, The ratio of carrier power to noise power in the BeiDou signal is defined as the carrier-to-noise ratio of the BeiDou signal.

6. A system for transmitting BeiDou positioning information based on a distributed base station within a tunnel as described in any one of claims 1-5, characterized in that, include: The data acquisition unit includes setting up several BeiDou positioning base stations in the tunnel, using an intelligent networking algorithm to connect the several BeiDou positioning base stations to form a network topology, and acquiring the positioning data of each BeiDou positioning base station. The processing unit is connected to the data acquisition unit to acquire positioning data from each BeiDou positioning base station; and sequentially cleans, filters, and fuses the positioning data from several BeiDou positioning base stations, outputs optimized data, and transmits the optimized data to the user terminal. An information receiving unit is connected to the processing unit and the user terminal respectively, and is used to obtain the operating voltage of the Beidou positioning base station; The control unit is connected to the data acquisition unit, the processing unit and the information receiving unit respectively, and is used to determine whether the transmission stability of the positioning information meets the requirements based on the abnormal difference between the actual working voltage and the standard voltage of the Beidou positioning base station. If the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is greater than the preset first abnormal difference, then it is determined that the transmission stability of the positioning information does not meet the requirements. If the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is greater than the preset first abnormal difference and less than or equal to the preset second abnormal difference, it is preliminarily determined that the effectiveness of the intelligent networking does not meet the requirements, and the effectiveness of the intelligent networking is determined based on the transmission delay of the optimized data. If the abnormal difference between the actual operating voltage and the standard voltage of the Beidou positioning base station is greater than the preset second abnormal difference, then the operating mode of the faulty Beidou positioning base station will be adjusted. Determining whether the effectiveness of intelligent networking meets the requirements based on the transmission delay duration of optimized data is crucial. If the transmission delay of the optimized data is greater than the preset first delay, then the effectiveness of the intelligent networking is determined to be unsatisfactory. If the transmission delay of the optimized data is greater than the preset first delay and less than or equal to the preset second delay, then the bit error rate threshold of the Beidou positioning base station is increased. If the transmission delay of the optimized data is longer than the preset second delay, it is initially determined that the transmission stability of the BeiDou signal does not meet the requirements. The transmission stability of the BeiDou signal is then determined based on the carrier-to-noise ratio of the BeiDou signal. Additionally, the control step size of the transmission power of the BeiDou positioning base station is adjusted based on the carrier-to-noise ratio of the BeiDou signal.

Images