中文摘要：

目前，对铁路FSK信号解调的方法主要有傅里叶变换、Wigner—Ville分析法以及小波分析法等，它们都存在着一定的不足，基于此，文章提出了一种基于HHT算法的时频分析法来实现轨道电路移频信号的解调，给出了HHT具体的算法步骤，并运用计算机MATLAB平台对载频为，f0、频偏为△f、低频为fc的FSK信号进行了仿真分析；仿真结果表明，采用HHT算法可准确地解调出移频信号的上边频频率、下边频频率和低频调制频率，取得了很好的效果，从而实现了轨道电路移频信号的解调。

英文摘要：

At present, the railway FSK signal demodulation methods are mainly Fourier transform, Wigner Ville analysis and wavelet analysis method, etc. and they all have some deficiencies. Based on this, a time-frequency analysis method to realize he track circuit fre-quency-shift signal demodulation based on the HHT is proposed in this paper. This paper presents the HHT specific algorithm steps, and use computer MATLAB platform on f0. △f and fc for the FSK signal, a simulation analysis was carried out. The simulation results show that, using HHT algorithm can accurately calculate the frequency-shift signal, on the upper-frequency and down frequency and low fre-quency modulation frequency of frequency-shift, achieves good results and realizes the track circuit frequency shift signal demodulation.