Automatic registered back‐projection approach based on object orientation for airborne repeat‐track interferometric SAR

Abstract

The requirements of the correction of motion errors and high accurate registration are difficult to satisfy for the independence of the aperture paths in airborne repeat-track interferometry. Here, according to the principle of the independence between the imaging scene and synthetic aperture radar (SAR) viewing geometry, the authors propose a new SAR imaging approach based on the idea of object orientation and back-projection (BP), where the complex motion compensation is effectively avoided and the image formation and registration are achieved simultaneously with high accuracy. In contrast to the standard BP algorithm, it greatly reduces the difficulty of registration brought by the irregular deviations. Moreover, it further successfully overcomes the influence introduced by the centre-beam approximation compared with frequency-domain algorithms. Experimental results both on simulated and actual SAR data are used to validate the proposed algorithm.