基于FPGA的调频信号的解调方法  

Demodulation of PCM-FM Signal Based on FPGA

作　　者：闫冬[1] 成亚勇[1] 孙大元[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2016年第6期34-37,56,共5页Radio Engineering

基　　金：国家高技术研究发展计划("863"计划)基金资助项目(2013AA122105)

摘　　要：航天飞行器飞行的焰尾对信号的影响很大,针对这个问题,测控系统提出了具有很强抗干扰能力的调频遥测信号。调频遥测信号相干解调需要用到反三角计算,介绍了一种基于FPGA相干解调方法即坐标旋转计算(Coordinate Rotation Digital Computer,CORDIC)硬件鉴频算法,同时通过仿真对理论值、计算值与硬件算法的性能进行了比较。结果表明这种算法的性能接近理论值,适用于调频遥测解调。According to the characteristic of aerospace craft,the flame of craft has great influence on the signals,thus the frequency modulated telemetry signal with high anti-interference capability is proposed for aerospace TTC system. Because of anti-triangle counting used in coherent demodulation of frequency modulated telemetry signal（ FM-PCM）,coordinate rotation digital computer（ CORDIC） is used as demodulation method of FM-PCM signal based on FPGA.According to simulation,by comparing the theoretical value,computing value and hardware value,it＇s concluded that the hardware value with CORDIC is much similar with theoretical value,so this demodulation method is suitable for the demodulation of frequency modulated telemetry signal.

关 键 词：调频遥测 CORDIC FPGA 相干解调 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]