移频信号解调算法研究与DSP实现

随着我国高速铁路的快速发展,快速准确的检测列车自动控制系统中轨道电路移频信号参数成为了列车安全运行的重要保证.针对现有轨道电路移频信号检测算法在检测精度和检测时间上的局限,以及传统测试仪在智能化上的不足,对移频信号的频谱特点进行了分析研究,基于频谱特点利用欠采样技术和汉宁窗频谱重心校正算法对移频信号参数进行了解算,并基于DSP搭建了实验平台对算法进行了移植和实测验证.实验结果表明,该算法能够快速准确地自动检测出移频信号的各项主要参数.

Research and implementation on DSP of frequency-shift signal demodulation algorithm

With the rapid development of high-speed railway, accurate and quick detection of track circuit frequency-shift signal parameters in train automatic control system becomes the important guarantee of train safe running. Aiming at the limitations on detection precision and times of current track circuit frequency-shift signal detection algorithms, and the shortcoming on intelligence of traditional frequency-shift signal testers, through the analysis of frequency-shift signal frequency spectrum characteristics, the undersampling technology and Hanning window spectrum orthocenter correction algorithm was given to demodulate the parameters of frequency-shift signal, and the testing platform based on DSP was set up to transplant and verify the algorithm, the test results show that, the mainly parameters of frequency-shift signal can be demodulated quickly accurately and automatically by the algorithm.