基于ZOOM-FFT的移频信号参数算法研究

The Algorithm Researcher of Frequency Shift Parameters Based on ZOOM-FFT

为了准确检测轨道电路移频信号的参数,在分析国内外轨道电路移频信号频谱特点的基础上,提出了针对两种不同信号分别采用整周期和欠采样的采样方法,在以上采样的基础上,介绍了ZOOM-FFT算法的原理和实现步骤,并采用ZOOM-FFT对信号载频附近的频段进行频谱细化放大,提取实验数据。仿真结果表明上述方法是可行的,可以准确检测轨道电路移频信号的参数,有效提高了信号的频率分辨率,满足了技术指标的要求。

To accurately measure the frequency shift parameters of railway circuit,this paper analyses the frequency spectrum characteristics of frequency shift signals in domestic and abroad railway circuit.A new sampling method is proposed which uses complete cycle sampling and deficiency sampling to the two different kinds of signals,and then the paper introduces the principle and process of the ZOOM-FFT algorithm,the method magnifies and specifies the neighboring frequency of carrier signal by using ZOOM-FFT algorithm,obtains the experimental data,the simulation result shows that the method is feasible to measure the frequency shift parameters exactly of railway circuit,it can effectively increase the frequency resolving power of the signal and satisfy the requirement of the technical standard.