轨道电路移频信号参数高精度快速检测算法的研究

Research of the Algorithm for the Quick Detection of Track Circuit Frequency-Shift Signal's Parameters with High Precision

现代铁路运行中,及时了解轨道电路移频信号的状态将直接影响到列车的行车安全;为了高精度、准确快速的检测轨道电路移频信号参数,通过分析轨道电路移频信号的频谱特点,对基于FFT的汉宁窗频谱校正算法在移频信号参数检测中的应用进行了研究,利用MATLAB对其进行仿真,结果表明在该算法下各参数检测值均满足误差指标要求,同时将采样时间缩短到1s以内,提高了检测的快速性,该算法为实时移频信号参数测试仪的设计提供了理论依据。

In the operation of modern railway, The train traffic safety is directly influenced by knowing the status of track circuit frequen- cy- shift signal in time. In order to accurately and quickly detect the parameters of track circuit frequency--shift signal with high precision, through the analysis of track circuit frequency--shift signal frequency spectrum＇s characteristics, the banning window correction algorithm based on FFT for the detection of frequency--shift signal＇s parameters was researched, 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 ls, the speedability of detection is improved. This algorithm provides the theoretical background for designing the real--time parameter detector of frequency--shift signal.