一种基于余弦变换的LFM／CW测距系统信号处理方法

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。

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

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.