基于AM-LFM分解的微动信号提取

Micro-Doppler Signal Extraction Based on AM-LFM Decomposition

该文针对微多普勒信号与目标主体回波信号分离的问题,分析了包含微动结构的雷达回波模型,指出目标主体信号分量多普勒频率是固定的,而微多普勒信号的多普勒频率是时变的,且可用分段的线性调频信号拟合。在此基础上,提出了一种基于调幅-线性调频(AM-LFM)分解的微动信号分离算法,该算法根据调频率来判定各调幅-线性调频分量的对应结构,实现微多普勒信号提取。仿真及实测数据处理结果验证了算法的有效性。

The issue of micro-Doppler signal separation from collected data of targets with micro-motion structures is addressed.The signal mode for target with micro-motion structures is analyzed and the results show that the Doppler frequency of main body is constant and the micro-Doppler frequency is time varying,which can be fitted by a series of piecewise linear frequency modulation signal.A method,which decomposes radar signal to AM-LFM （amplitude modulation-linear frequency modulation） components and determines each component’s corresponding structure by frequency modulation rate,is proposed to extract micro-motion echoes from the main body echoes.Simulated and experimental results verify the correctness of proposed method.