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System and method for positioning rail train tunnel by using communication signal

A communication signal and train technology, applied in the field of rail train tunnel positioning, can solve problems such as inability to use radar equipment for train positioning, difficulty in applying for radio frequency licenses, train communication signal interference, etc., achieve good direction backtracking performance, and improve train positioning. The effect of precision and reliability improvement

Active Publication Date: 2021-10-29
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem in the above-mentioned prior art that it is difficult to apply for a radio frequency license and the spectrum usage period is short, radar positioning signals interfere with train communication signals, making it impossible to use radar equipment for train positioning; the purpose of the present invention is to provide a method using communication A system and method for locating rail train tunnels based on signals. The polarized torsion beacon is set to cooperate with the train positioning system, and the original communication signal of the train is used as the speed measurement signal to realize the positioning of rail train tunnels based on communication signals.

Method used

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  • System and method for positioning rail train tunnel by using communication signal
  • System and method for positioning rail train tunnel by using communication signal
  • System and method for positioning rail train tunnel by using communication signal

Examples

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Embodiment 1

[0064] This embodiment provides a system for positioning rail train tunnels using communication signals, such as figure 1 As shown, it includes: a locator and at least one polarization-reversed beacon, wherein the locator includes: four parts: a transmitting end, a receiving end, a superheterodyne component and a digital acquisition processor, and the polarization-reversed beacon can reverse the received signal Polarization characteristics, so that the transmission and reception signals are polarized orthogonally;

[0065] The sending end includes: a bidirectional power splitter A1, a power amplifier A2, a power splitter A3, a transmitting antenna A4 and a communication antenna A5, and the input end of the bidirectional power splitter A1 is connected to the antenna port of the original communication equipment of the train to output communication signals, The output ends are respectively connected to the communication antenna A5 and the power amplifier A2, the output end of the...

Embodiment 2

[0072] This embodiment provides a method for locating rail train tunnels using communication signals, and its application scenarios are as follows Figure 4 As shown, the locator is installed on the top of the train head, and the polarization torsion beacon is installed on the wall at the same height as the locator in the tunnel; when the train passes the beacon, the transmitting antenna A4 of the locator can just face beacon.

[0073] In this example, the radial velocity v t The mathematical model of the change is:

[0074]

[0075] Among them, t represents the time, v represents the speed of the train, L 0 represents the distance between the locator and the beacon along the x-axis direction, and h represents the distance between the locator and the beacon along the y-axis direction.

[0076] The positioning method provided in this embodiment uses a system for positioning rail train tunnels using communication signals provided in Embodiment 1 for measurement. The proces...

Embodiment 3

[0123] In order to further illustrate the parameters of the present invention and the process of signal processing, this embodiment adopts a system and method for positioning rail train tunnels using communication signals provided in Embodiment 1 and Embodiment 2, and provides the following specific values An example of a method:

[0124] The two-way power distributor A1 receives the communication signal S provided by the train communication equipment T1 After (t), one path is used for normal communication through the communication antenna A5 transmission, and the other path is used as a speed measurement signal after passing through the power amplifier A2; the communication signal S based on the amplitude-phase modulation T1 The general model for (t) is:

[0125] S T1 (t)=a(t)cos[2πf RF t+φ(t)]

[0126] In this example, select S T1 (t) The modulation method is 16QAM, which sends digital information by periodically adjusting the amplitude and phase of the sinusoidal elect...

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Abstract

The invention belongs to the field of rail transit and positioning, and provides a system and a method for positioning a rail train tunnel by using a communication signal. The method and system are used for solving the problem that in the prior art, due to the fact that radio frequency use permission application is difficult, the frequency spectrum service life is short, radar positioning signals interfere train communication signals, and consequently train positioning cannot be conducted through radar equipment. The system comprises a positioner arranged on a train and at least one polarization torsion beacon arranged on the inner wall of the tunnel, the positioner adopts a double-channel design of a reference channel and a measurement channel, the positioning of the rail train tunnel can be realized based on a reference signal generated by the communication signal of the rail train and a speed measurement signal; other equipment does not need to additionally generate signals of other frequencies, so that the application of signal interference and frequency spectrum permission is avoided; meanwhile, matching the system, the method provided by the invention can ensure the positioning precision and reliability of rail train tunnel positioning.

Description

technical field [0001] The invention belongs to the field of rail transit and positioning, and specifically provides a system and method for positioning rail train tunnels by using communication signals. Background technique [0002] Rail train positioning is to determine the one-dimensional position of the train on the track. By supplementing the positioning in the environment where GPS is seriously blocked and cannot be used, such as tunnels, the entire positioning of the train can be realized, and the safety and efficiency of driving can be more effectively improved. The main methods of existing train positioning include: track circuit method, ground transponder method, cross cable loop positioning method, speed measuring positioning method. [0003] Existing ground transponder method provides a kind of on-the-head transponder method such as the document "Design and Test of Train Precise Positioning System Based on RFID Technology" (Journal of Dalian Jiaotong University, ...

Claims

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Application Information

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IPC IPC(8): B61L25/02
CPCB61L25/025
Inventor 陈祝明王鹏飞王则寰
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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