基于FFT频谱校正的移频信号检测算法的研究

摘要

The train traffic safety is directly influenced by the status of track circuit frequency-shift signal. In order to accurately detect the parameters of track circuit frequency-shift signal with high precision, a spectrum correction algorithm based on fast Fourier transform (FFT) is proposed through the spectrum correction of Han-ning window and undersampling technique. The results of computer simulation for such algorithm under Matlab show that the detected values of each parameter would fulfill the requirement of the error, and the sampling time could be shortened to 1. 6 s (or 2 s). In fact, this algorithm provides the theoretical background for studying the real-time parameter collector of frequency-shift signal.%轨道电路移频信号是否正常直接影响到列车的行车安全.为了准确、高精度地检测轨道电路移频信号参数,利用汉宁窗的频谱校正和欠采样技术,给出了基于快速傅里叶变换( FFT)的频谱校正算法.利用Matlab对其进行仿真,结果表明各参数检测值均满足误差指标要求,且将采样时间缩短到1.6s(或2s).该算法为研究实时移频信号参数测试仪表提供了理论依据.