【作者】 姜晓庆；

【导师】 杜普选；

【作者基本信息】 北京交通大学 ， 电路与系统， 2008， 硕士

【摘要】 国内目前存在多种轨道信号系统,出于对铁路的安全运行要求,希望能够提供一套系统可以模拟各种轨道信号的发送,并尽可能的模拟各种实际干扰,为铁路信号的理论研究及实际操作提供参考。另一方面,随着国内列车不断提速,对机车信号要求越来越高,而国内主要的轨道信号信息量少,很难实现高效率的列车控制。从法国引入的TVM430信号是一种具有27Bit信息的数字编码轨道信号,能够满足高速列车对信息量的需求,但是该信号最大缺陷是解调速度慢,由于国产化程度低导致该信号运行成本昂贵,目前仅在秦沈客运段开通使用。针对以上问题,本文主要做了两部分工作:首先设计了一套轨道信号发送系统,实现了国内轨道信号的实时发送,同时利用C++ Builder设计了人性化的上位机界面,便于操作。该系统是2008年全国TI DSP大奖赛系统组北京交通大学参赛项目的重要组成部分,参赛项目最终获得全国优胜奖。此外,本文重点对TVM430信号进行技术改造,在不降低信息量的同时降低信息位,同时对重要的码字采用CRC校验与奇偶校验相结合的原则,保证重要信息位的正确性。重新定义了改进TVM430信号的低频信息的频率及幅度,着重讨论并确定了低频信息的相位,使得在该组相位下,任意低频信号叠加后的波形幅度变化相对较小。本文以TMS320VC33为平台,研究改进后的TVM430信号发送与解调策略,测算了改进后的TVM430信号解调速度,有力证明了改进方案的有效性,在一定程度上实现了TVM430数字编码轨道信号的国产化技术改进。更多还原

【Abstract】 There are several railway signal systems in our country. For the safe operation, it’s necessary to provide a railway signal sending system that can simulate not only all kinds of the present signals but noise. On the other hand, with the acceleration of domestic train, the requirement for the railway signals turn more and more strict, however, it is hard to control the train efficiently because we have not enough bits in our railway signals. Came from France, the TVM430 digital coded signal has more information up to 27 bits, which can meet the need of high-speed train. But slow demodulation is the biggest flaw for TVM430, otherwise, it’s expensive for our country to use TVM430 because it hasn’t been improved by us. Now it’s only used in Qinhuangdao-Shenyang railway line for passenger traffic.For the above problems, the work of this paper composed of two parts:First, design a set of railway signal sending system which can send railway signals on real-time, and provide an interface designed by C++ Builder that is useful for operation. This system is an important part of "Simulation System of Railway Signal Transmission and On-board Cab Signal Receiving" which achieves champion in the national DSP competition organized by TI.Furthermore, this paper focuses on TVM430’s technical improvements. We reduce the number of TVM430’s low-frequency modulating signals while make sure the same information as TVM430, and search cycle generating polynomial for the improved TVM430 and add parity checking to the important code words. We also redefine frequency and amplitude for low-frequency modulating signals and discuss the phase information, so make the synthesis signal’s amplitude have small change.Using TMS320VC33 as a platform we study the sending and demodulating strategy of the improved TVM430, and calculate the decoding speed. It’s true that the improved TVM430’ demodulating speed is quicker that TVM430 signal.更多还原