ISAR Based on Micro-Motion Analysis and Chirplet Separation

When target or its parts exist micro-motion,ISAR is severely contaminated by the micro-Doppler effect caused by the micro-motion.To solve the problem,the micro-motion models of translation and rotation and vibration are analyzed,and then the time-fre- quency distribution of this micro-motion are discussed.After echoes are decomposed with Chirplet transformation,an algorithm,which separates signals using micro Doppler and micro Doppler rate in Chirplet parameter domain,is investigated.The algorithm is verified by simulation data of point-scatterer and real data of an airliner,the micro-Doppler are separated well and nice ISAR images are obtained.