频谱修正与还原方法在轨道移频信号检测中的应用

在轨道移频信号的参数检测中,为了达到较高的检测精度,满足良好的实时性要求,提出了以快速傅立叶变换（Fast Fourier Transform,FFT）算法为基础的频谱修正与还原的方法.在低分辨率频谱中,通过谱线位置插值和谱线幅度合成,将泄漏状态下的频谱还原为接近无泄漏状态,实现移频参数的准确、快速获取.与传统的频谱细化算法相比,该方法具有兼顾检测精度与实时性的优点.利用Matlab对该检测方法进行仿真分析,证明该方法有效、可行,为轨道移频信号检测仪的设计提供了依据.

Application of Spectrum Correction and Reduction in Track FSK Signal Detection

In order to acquire a higher accuracy and meet the demands of real-time property in the Track FSK signal detection,a method of spectrum correction and reduction based on the FFT algorithm is presented.The method is to revert the spectrum from leakage state into non-leakage state by line position interpolation and synthesis of spectral range in the low resolution spectrum,thus achieving exact and rapid acquisition of shift frequency parameters.Compared with the traditional spectrum detailing algorithm,this method has high accuracy and real-time property.The simulation of the method by using Matlab shows it is effective and feasible,providing a basis for the design of a railway frequency shift signal detector.