论文部分内容阅读
随着铁路的迅速发展,需要更多的信息量和更加有效的铁路信号检测方法,为保证列车的安全正点运行,对铁路移频轨道电路进行实时检测。利用频谱分析法能求出移频信号的中心频率和低频参数,但不能得出移频信号的上边频和下边频。而相位推算法正好弥补了这一缺点。文中介绍了一种相位推算法检测FSK信号方法,从而得出移频信号的中心频率、低频参数、上边频和下边频这些参数。
With the rapid development of the railway, more information and more effective railway signal detection methods are needed. In order to ensure the train safety and punctuality operation, real-time detection of railway frequency-shift track circuits is carried out. The spectral analysis method can be used to find the center frequency and low frequency parameters of the frequency shift signal, but can not get the upper frequency and the lower frequency of the frequency shift signal. The phase estimation method just make up for this shortcoming. In this paper, a phase estimation algorithm FSK signal detection method to derive the frequency of the center frequency of the signal, the low frequency parameters, the upper frequency and lower frequency of these parameters.