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

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...

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 several thousand or even tens of thousands of MIPS (Million Instructions Per Second, millions of instructions per second) can achieve real-time decoding

Therefore, the existing BTM message decoding system has the disadvantages of slow decoding speed and inability to achieve better real-time decoding, and if better real-time performance is to be achieved, the performance requirements of the device are very high, which will inevitably increase the power consumption and cost of the device

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