A Novel Ground Moving Target Radial Velocity Estimation Method for Dual-Beam Along-Track Interferometric Sar

Abstract

Traditional dual-beam along-track interferometric synthetic aperture radar(DB-AT-InSAR) system uses along-track inter-ferometry(ATI) technique to calculate the radial velocity. However, the interferometric phase acquired by ATI can be easily affected by the noise and static clutter, which may reduce the accuracy of radial velocity estimation. In this paper, a novel ground moving target radial velocity estimation method is proposed for DB-AT-InSAR. First, the azimuth squint angle of the DB-AT-InSAR is reduced to make the fore and aft beams overlap. Then, only the overlapping subaperture echoes are used to reconstruct the SAR images by back projection algorithm. Finally, clutter suppression interferome-try(CSI) technique is applied to acquire high-accuracy radial velocity estimation. Since CSI technique can be able to suppress the clutter, it can obtain better interferometric phase than ATI, which improves the accuracy of radial velocity estimation. Simulation results show that the proposed method can obtain higher accuracy in radial velocity estimation than ATI method for DB-AT-InSAR system.