China train control system (CTCS) point type transponder demodulating device and implementation method thereof

Abstract

The invention discloses a China train control system (CTCS) point type transponder demodulating device. The device consists of a 4M antenna, a matching circuit, a power amplifier circuit, a band pass filter circuit, an analog / digital (AD) sampling module, a signal detection circuit, a field programmable gate array (FPGA), a rectification circuit and a through point detection circuit, wherein the FPGA consists of the AD sampling module, a differential module, a compatible integrated circuit (CIC) extraction filter module, a compensation filter, a finite impulse response (FIR) filter module and a signal judgment module. The CTCS point type transponder demodulating device can receive and demodulate effective data in a transponder in a wireless mode, can read and verify data written by programming equipment, and can demodulate data of transponders of other manufacturers. The technology can be applied to a transponder transmission module of vehicle-mounted receiving equipment. The CTCS point type transponder demodulating device can demodulate information quickly when a train drives at a high speed and passes through the transponder and provides safe and reliable operating data to a train operation control system. The device has the advantages of simple structure, low cost and high precision.

Description

technical field [0001] The invention relates to a point type transponder in a Chinese train control system CTCS, in particular to a CTCS point type transponder demodulation device and a realization method thereof. Background technique [0002] With the continuous increase of train speed in recent years, the requirements of railway transportation for train control system are getting higher and higher. In foreign railway transportation systems, the absolute position information of the train is basically provided by special ground equipment to the on-board system, and this equipment is a point transponder. Correspondingly, a transponder demodulation module is installed on the train, which is mainly used to send wireless energy signals to activate the point transponder, and at the same time receive the FSK signal sent by the point transponder and restore the message in the point transponder information. In order to ensure the high reliability of communication, the CTCS of t...

AI Technical Summary

Problems solved by technology

In order to ensure the high reliability of communication, the CTCS of the prior art adopts a complex set of rules to encode the data message, and the identification device needs to perform corresponding decoding operations after receiving the message to obtain a reliable data message. The structure of the device is complex, and the error tolerance of the decoding operation is low. Especially, the current demodulation uses analog signals, and its anti-interference ability is poor.

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