基于Blackman窗四谱线插值FFT的轨道电路信号分析  

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

作　　者：温术来 张磊 于树永 翟一霖 WEN Shulai;ZHANG Lei;YU Shuyong;ZHAI Yilin

机构地区：[1]北京铁路信号有限公司,北京102613

出　　处：《铁道通信信号》2023年第6期14-20,25,共8页Railway Signalling & Communication

基　　金：北京铁路信号有限公司科研课题(2000-K1220003)。

摘　　要：为了更好地对具有移频特征的轨道电路信号进行高精度解析,在分析轨道电路信号特点基础上,提出一种基于Blackman窗四谱线插值算法模型,采用模拟仿真的方式,对ZPW-2000A轨道电路信号载频、调制频率及幅值等特征量进行了解析研究。结果表明:该算法模型可显著降低常规频谱分析中频谱泄漏及栅栏效应的影响,大幅提高轨道电路信号载频、调制频率以及幅值的解析精准度,其中载频误差控制在0.006 Hz,解析结果显著优于常规快速傅里叶变换处理结果,具有一定的工程应用价值。In order to better analyze the track circuit signal with frequency shift characteristics with high accuracy,a four-spectrum-line interpolation algorithm model based on Blackman window is proposed on based of the characteristics analysis of track circuit signal.And the ZPW-2000A track circuit signal carrier frequency,modulation frequency,amplitude and other characteristics are analyzed by simulation.The results show that the algorithm model could significantly reduce the spectral leakage and fence effect generated in conventional spectrum analysis,and greatly improve the analysis accuracy of track circuit signal carrier frequency,modulation frequency and amplitude.The carrier frequency error is controlled at 0.006 Hz,and the analytical results are significantly better than that of conventional FFT processing,which has certain engineering application value.

关 键 词：轨道电路 四谱线插值 快速傅里叶变换 移频键控 窗函数 

分 类 号：TM911.4[电气工程—电力电子与电力传动]