采用Chirp-Z变换提高LFMCW雷达的测距离精度  

Improving Range Precision of LFMCW Radar by Chirp-Z Transform

作　　者：陈祝明[1] 丁义元[1] 向敬成[1] 

机构地区：[1]电子科技大学电子工程系,成都610054

出　　处：《信号处理》2002年第2期110-112,106,共4页Journal of Signal Processing

摘　　要：１ＦＭＣＷ雷达在理论上具有很高的测距精度和距离分辨力，然而在实际系统中，由于其采用ＦＦＴ进行信号处理所固有的频域采样间隔，使得其测距精度与距高分辨力处于同一数量级。为此，本文在传统ＦＦＴ处理的基础上，采用Ｃｈｉｒｐ－Ｚ变换进一步对其回波中频距离谱的主瓣进行局部细化，从而在运算量增加不多的情况下，大大提高１ＦＭＣＷ雷达的测距精度，以满足高精度测距的实际需要。The Linear Frequency Modulation Continuous Wave (LFMCW) radar has high theoretical range precision and range resolution, but the practical range precision is the same order as the range resolution because of the inherent frequency space of FFT in signal processing. In this paper, Chirp-Z transform is adopted to reduce the frequency space of main lobe of echo range spectrum based on the FFT and to increase less operation. This method can consumedly improve the range precision of LFMCW radar and satisfy with the practical needs of high precision radar ranging

关 键 词：CHIRP-Z变换 LFMCW雷达 测距离精度 

分 类 号：TN953.2[电子电信—信号与信息处理]