基于Hanning窗四谱线插值FFT的轨道电路信号解析研究  

Track Circuit Signal Analysis Based on Hanning Window Four-spectrum-line Interpolation FFT

作　　者：温术来 Wen Shulai

机构地区：[1]北京铁路信号有限公司,北京102613

出　　处：《铁路通信信号工程技术》2023年第S01期63-69,80,共8页Railway Signalling & Communication Engineering

摘　　要：移频信号是ZPW-2000A轨道电路系统关键特征之一,对其高精准度解析具有重要意义。基于移频轨道电路信号特点,提出一种基于时域加窗、频域插值的高精准度解析算法,并应用模拟仿真的方法进行验证研究。研究结果表明,通过时域加窗处理可有效改善常规FFT中出现的频谱泄漏问题,进一步在频谱中插值可提高信号解析准精度。通过本算法解析移频轨道电路载频最大误差为0.000 32 Hz,解析调制频率最大误差为0.002 63 Hz,以上误差范围均能够满足对轨道电路信号解析要求。Frequency-shift signal is one of the most important features of ZPW-2000A track circuit system,and high-accuracy analysis of the signal is of great significance.Based on the characteristics of the signal,a high-accuracy FSK signal parameter algorithm is put forward in this paper based on time domain window function and frequency domain interpolation method,and the algorithm is verified through simulation.Results show that using windows in time domain of the signal can reduce the spectral leakage resulting from traditional FFT method,and further interpolation in frequency domain is used to improve the accuracy of signal parameter analysis.By using the proposed algorithm to analyze frequency-shift track circuits,the maximum error of the carrier frequency is 0.00032 Hz and the maximum error of the modulation frequency is 0.00263 Hz.These errors are within the acceptable range for analyzing track circuit signal parameters.

关 键 词：轨道电路 四谱线插值 快速傅里叶变换 移频信号 

分 类 号：U284.2[交通运输工程—交通信息工程及控制]