便携式列车接近安全报警系统的信号处理

针对远方列车信号很小，且具有很强的噪声，直接通过时域分析误差较大，因此，采取频域分析方法，获取列车接近时的警报信号的规律，以用于便携式列车接近安全报警系统中．对行进中列车车轮冲击钢轨接缝产生振动和声音信号进行分析，得到列车接近的信号规律．经过仿真运行，该方法能够较准确的反映出信号的规律．

Portable Safety Alarming System of Train Approaching

Because the signal is small and mixed with the strong noise, it will produce the er- ror under the time-domain analysis. So by means of the frequency-domain analysis, the character of alarming signal can be deduced and used in the system of portable safety alarming system of train approaching. The wheel of train in the movement can produce the vibration and sound sig- nals by impact with the rail joint, which can be analysed in the frequency domain, and get the character of the signals. Through the simulation, it proved to be a ideal method to conclude the character of signals.