Method and device for decoding BTM (Balise Transmission Module) message, and train control system based on balise

A decoding method and a decoding device technology, which are applied in the field of railway communication, can solve the problems of slow decoding speed, message loss, increased device power consumption and cost, etc., and achieve the effects of fast decoding speed, low power consumption and cost

Active Publication Date: 2010-12-22
CRSC RESEARCH & DESIGN INSTITUTE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing BTM message decoding method usually uses a serial method for decoding, and the time required for one decoding is 1-5ms, and the time for sending 1 bit of the message is only 1.77us, that is, each decoding process will cause More bits of the message are lost. If you want to complete bit-by-bit sliding decoding, you need hardware with high computing power to realize bit-by-bit moving real-time decoding. When the DSP is required to have an operating capacity of sev

Method used

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  • Method and device for decoding BTM (Balise Transmission Module) message, and train control system based on balise
  • Method and device for decoding BTM (Balise Transmission Module) message, and train control system based on balise
  • Method and device for decoding BTM (Balise Transmission Module) message, and train control system based on balise

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Experimental program
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Effect test

Embodiment 1

[0069] During the operation of the train, the balise is used to provide various point information required by the train to the train on-board control system, including line information, station information, positioning information, turnout information and speed limit information, etc. BTM receives the information sent by the balise , and decode the message in the information, and then forward it after decoding.

[0070] The embodiment of the present application provides a BTM message decoding method, which is used for fast bit-by-bit mobile real-time decoding of the message in the information sent by the responder, such as figure 1 As shown, it is a schematic flow chart of a BTM message decoding method provided in the embodiment of the present application, which specifically includes the following steps:

[0071] Step S110 : Buffering the two channels of message data sent by the responder and different after preprocessing using FIFO respectively.

[0072] The signal sent by t...

Embodiment 2

[0100] On the basis of Embodiment 1, in this embodiment, as Figure 4 As shown, step S150 may also specifically include the following steps:

[0101] Step S251: respectively judge whether the data bits of the two packets are reversed.

[0102] If yes, go to step S252; if no, go to step S253.

[0103] Step S252: Invert all the bits of the message data to restore the correct message data.

[0104] That is, compare whether the value of the 109th bit in the message is equal to 1, and if so, it indicates that the message data has been reversed during transmission, and all bits of the message data need to be reversed.

[0105] S253: This step is the same as step S151.

[0106] Step S254: Check whether the control bit of the message data of this channel is correct.

[0107] If yes, go to step S256; if not, go to step S255.

[0108] Step S255: Determine that the message data is in an unrecognizable format and the decoding fails, and send the decoding failure information.

[0109...

Embodiment 3

[0113] The embodiment of the present application also provides a BTM decoding device, such as Figure 5 As shown, it is a schematic structural diagram of the BTM decoding device provided in the embodiment of the present application, the device includes:

[0114] Buffering unit 51: used for buffering the two different message data sent by the transponder after preprocessing, using FIFO respectively, and each message data contains multiple messages;

[0115] Bit-by-bit verification unit 52: used to sequentially select fixed-length data from each channel of message data for verification;

[0116] Message header synchronization unit 53: used to respectively find the message headers of each path of message data after verification, and align the message headers;

[0117] Message data processing unit 54: respectively convert, descramble and restore the first word of the two channels of message data aligned with the message headers to obtain two channels of user data;

[0118] Such ...

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Abstract

The invention discloses a method and a device for decoding a BTM (Balise Transmission Module) message, and a train control system based on a balise. The method comprises the steps of: respectively buffering two paths of preprocessed message data sent by the balise; then, sequentially selecting data with fixed length from the two paths of message data, and checking and calculating; respectively aligning message headers of the two paths of message data; respectively carrying out effective character check, replacement, descrambling and first character restoring to obtain two paths of user data; and finally, judging whether the two paths of user data are same or not, if yes, decoding successfully. In the embedment, the data with fixed length is checked by adopting 11-bit concurrent operation bit width when decoding; and for long code messages, one message is checked by only using 103 clock periods, i.e. the error detection is carried out on one long code message under 100MHz clock by only needing 1.03mu s which is far less than the time (654.48kbs, about 1.77mu s) of sending one message bit.

Description

technical field [0001] The present application relates to the field of railway communication, in particular to a BTM message decoding method, device and transponder-based train control system. Background technique [0002] The transponder is used to provide various point information required by the train to the on-board control system of the train, including line information, entry information, positioning information, turnout information and speed limit information. The main function of BTM (Balise Transmission Module, balise transmission module) is to send a downlink signal to activate the ground balise during the train operation, and receive the uplink information from the balise, and process the message in the uplink information decode and forward. [0003] figure 1 It is a schematic diagram of a sliding window for message reception. According to the protocol of the European railway transportation management system coding standard UNISIG SUBSET-036, the receiver proce...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L1/00
Inventor 杨光伦袁栩宁鑫
Owner CRSC RESEARCH & DESIGN INSTITUTE GROUP CO LTD
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