一种基于余弦变换的LFM/CW测距系统信号处理方法  

A Signal Processing Method for LFM/CW Range Finder Based on Cosine Transform

作　　者：赵继广[1] 宋一铄[1] 

机构地区：[1]装备指挥技术学院航天装备系

出　　处：《装备指挥技术学院学报》2010年第6期88-90,共3页Journal of the Academy of Equipment Command & Technology

基　　金：部委级资助项目

摘　　要：LFM／CW体制测距系统将目标距离信息转化为由回波信号与本振信号混频得到的差频信号的频率信息，通过分析该差频信号初始相位与目标距离的关系，研究了在测距中使用余弦变换代替傅里叶变换处理差频信号的可行性，分析了余弦变换引入的测距误差与系统参数间的关系，为减少处理差频信号时的运算量提供了理论参考。LFM/CW system range finder transforms the information of distance into the frequency of IF signal, the difference of the echo signal and the local oscillate signal. Based on the analysis of the relations between the initialization phase and distance, this paper studies the feasibility of processing IF signal with cosine transform rather than with Fourier transform, and presents the relations that lie between the distance error and system parameters. These provide the theoretical reference to reduce the calculation amount while processing IF signal.

关 键 词：LFM/CW体制 差频信号 余弦变换 测距误差 运算量 

分 类 号：TN91[电子电信—通信与信息系统]