Micro-Doppler Signal Extraction Based on AM-LFM Decomposition
He Si-san①,Zhou Jian-xiong①,Zhao Hui-ning②,Fu Qiang①
①School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China; ②The Missile Institute of the Air Force Engineering University, Sanyuan 713800, China
Abstract：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.
2010, Vol. 32 
