Micro-Doppler Extraction of Vibrating Target Based on ATI Technique and Radon Transform in SAR

Aiming at extracting the time-varying micro-Doppler feature of the vibrating target in ground clutter environment,the method of micro-Doppler extraction based on dual-channel ATI technique and Radon transform is presented.The ATI technique is utilized to suppress ground clutter and obtain the interferometric signal of the vibrating target,which is presented as a straight line along the azimuth direction in the range-compressed data domain.The Radon transform is utilized to detect the weak straight line and find out which range cell it locates at.And the mathematical expressions of micro-Doppler with different vibrating directions are derived and discussed in detail.Compared with the single-channel situation,it is no need to compensate for the Doppler shift caused by the radar's translation,and the target vibrating along the azimuth direction could be effectively detected,whose micro-Doppler presents remarkably nonperiodic feature.Simulated results verify the accuracy and availability of the proposed method.