雷达目标模拟器LFM信号线性度校准研究

Research on LFM signal linearity calibration in radar target simulator

线性调频(LFM)信号由于其良好的时-频聚集性,被广泛应用于雷达系统中,其频率随时间变化的线性程度,对雷达测距精度及距离分辨率影响很大。为准确模拟雷达LFM回波信号,对雷达目标模拟器所产生的LFM信号,必须进行线性度校准。本文提出了一种基于小波变换的雷达目标模拟器LFM信号线性度校准算法,通过对来自不同模拟器的大量实测数据的实验测试,证明了算法的有效性,校准精度优于0.1%。

LFM（linear frequency modulated） signal is broadly used in radar system due to its good time-frequency concentration ability.However,radar range measurement precision and distinguishing ability tightly relies on the linearity of LFM signal.In order to simulate LFM radar echoes precisely,linearity calibration has to be carried out for the LFM signals produced by radar target simulator.This paper proposes a novel LFM signal linearity calibration method based on wavelet transformation for radar target simulator.The method has been verified with mass lab data acquired from different radar target simulators,and the calibration accuracy is better than 0.1%,which proves the effectiveness of the method.