铁路移频信号检测系统设计与实现  

Design and implementation of railway frequency-shift signal detection system

作　　者：杨帆[1] 戴胜华[1] 刘泽[1] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044

出　　处：《电子测量与仪器学报》2010年第5期500-505,共6页Journal of Electronic Measurement and Instrumentation

基　　金：国家"863"计划(编号:2007AA11Z118)资助项目

摘　　要：提出了一种基于单芯片的ZPW-2000A型铁路移频信号检测的方案。通过引入FIR数字滤波技术实现ZPW-2000A信号的主副频信号分离,使用频谱分析的方法检测移频信号的调制低频信息和上下边频信息,结合欠采样技术和Zoom-FFT技术提高低频频谱分辨率,用能量重心法校正上下边频的检测准确度,并将这种算法应用在ARM处理器上,实现了利用单芯片对移频信号的检测。测试结果表明上下边频检测误差不超过0.2Hz,调制低频检测误差不超过0.02Hz,该方案能提高铁路移频信号检测的精度,具有高集成度和高可靠性。A single-chip solution for detecting ZPW-2000A railway frequency-shift signal is proposed.FIR digital filtering technology was introduced to separate the main and accessory frequency of ZPW-2000A signal.FFT spectrum analysis technique was used in upper/down side frequency and low frequency detection.The accuracy of low frequency detection was increased by the combination of under-sampling technique and Zoom-FFT technique.High accuracy detection of the upper/down side frequency was obtained by applying energy centrobaric correction method.The method mentioned above has been successfully applied on ARM processor.Test results demonstrate that the upper/down side frequency detection error is less than 0.2 Hz,the low frequency detection error is less than 0.02Hz,this solution can increase the accuracy of railway frequency-shift signal detection,has high integration level and high reliability.

关 键 词：欠采样 ZOOM-FFT 谱校正 移频信号 ZPW-2000A 

分 类 号：U284.91[交通运输工程—交通信息工程及控制]