A Variable-Decoupling Method used in MSR-Based Imaging Algorithms for SAR with Constant Acceleration

In this paper, a variable-decoupling method for synthetic aperture radars (SAR) with three-dimensional constant acceleration is proposed. For SAR with constant acceleration, a high-order approximate slant range model is re-established. On this basis, the spectrum is obtained by the method of series reversion (MSR) that has five independent variables coupling, which makes the accurate processing of the spectrum difficult. Aiming at this problem, a variable-decoupling method based on Doppler centroid estimation and inertial navigation data is proposed for SAR with 3-D constant acceleration and MSR-based spectrum. Combined with the improved chirp-scaling algorithm (ICSA) which is based on the MSR-based spectrum, an improved wide-range imaging result is obtained.