An effective approach to ground moving target imaging for single channel SAR system

Based on the envelopes and the characteristics of Doppler spectrum of returns in single channel synthetic aperture radar (SAR) systems a method is proposed, which adopts two order Keystone Transform to adjust the range curvature of echo data, then range walk rates of echoes' envelopes are estimated to make some adjustments of walk and the Doppler parameters of moving targets are obtained through analyzing the Doppler spectrum of the moving targets. At last the images and positions of ground moving targets are gained, which make it possible that the moving targets can be indicated in right locations in SAR image. In addition the key motion parameters of moving targets can be estimated by the relationship between the Doppler parameters and motion parameters of ground moving targets. The results of the measured data show that this method can image ground moving targets and estimate motion parameters effectively.