Research On Real-time Encoding And Test Platform For Eurobalise Telegram

Balise is an intermittent type equipment for information transmission, which has been widely used in maritime, aerospace, communications, military and other fields as a medium for information transmission. In the 20th century 70's balise began to be applied to train control system. It is mainly used to transmit large numbers of data to on-board equipment to guarantee safety of train. In view of the advanced Eurobalise technology and taking into account the actual situation of the domestic railway, our country introduced and absorbed the related technologies of ETCS(European Train Control System), and then applied it to CTCS.Mastering transponder encoding method is one of the key of successful application of Eurobalise in our country. In our current railway system, telegrams are generates by pre-coding way. But with the growth of demand for railway transport, the existing encoding method can not meet the flexible demand. So Ministry of Railways prescribes using the real-time dynamic approach to generate telegrams. Therefore the research of real-time coding for Eurobalise telegram is of great significance and value.This paper first introduced Eurobalise technology and its application in CTCS and described telegram encoding strategies. Then the paper analyzed the principle of coding algorithm and proposed high-speed algorithm for key steps of the encoding strategy. By the way of software the paper validated and analyzed algorithm's correctness and efficiency. After the actual verification, we found that speed of software encoding can't reach the requirements of real-time encoding. So we must take into account adopting hardware way to come true. In this paper an integral implemental scheme was proposed for real-time encoding based on FPGA and realized encoding in the Quartus II environment according to encoding strategy for Eurobalise.Finally to roundly test the function and performance of total real-time encoding module, the paper designed a good specimen for testing with the function of telegram decoding and communication by the way of simulating TCC.