High-Speed Maneuvering Platform SAR Imaging With Optimal Beam Steering Control

Abstract

This paper would like to provide an optimal beam steering control method for high speed maneuvering platform synthetic aperture radar (SAR) imaging. A corresponding imaging algorithm with 3-D spatial-variation correction is proposed. First, the coordinates of beam footprint are calculated by the transition rule in each pulse repetition time. The transition rule is designed to get a unified image resolution and minimize the Doppler bandwidth. By the proposed imaging algorithm, 2-D spatial-variation envelop is corrected by azimuth keystone transform and range chirp scaling. Then the space-variant (SV) Doppler terms are compensated by frequency domain perturbation and time domain resampling. The SV components in both the second and the third-order terms are removed. Finally, the proposed beam steering method and the imaging algorithm are verified by simulated SAR data.