Amplitude/phase approach for target velocity estimation in AT-InSAR systems

Along track SAR interferometry (AT-InSAR) systems use more than one SAR antennas (typically two), mounted on the same platform and displaced along the platform moving direction. They are used to detect ground moving target. The information about the radial velocity of the moving target is estimated from the interferometric phase of the images. In this paper we show that exploiting not only the interferometric phase but both amplitude and phase of the two SAR images acquired with the AT-InSAR system the estimation accuracy can be sensitively improved. Moreover a closed form for the target radial velocity estimator and for the Cramer Rao lower bound has been derived.