Time-Domain Azimuth-Variant MOCO Algorithm for Airborne SAR Imaging

Abstract

Current subaperture-based azimuth-variant motion compensation algorithms for synthetic aperture radar (SAR) imagery usually suffer from the challenge of keeping high precision and efficiency simultaneously. In this letter, a novel motion compensation approach is developed to precisely correct the azimuth-variant motion errors. The proposed algorithm applies a time-domain filter to implement the precise Subaperture-to-Pulse correction, providing a promising azimuth-variant phase correction. Extensive experiments demonstrate the superiorities of the proposal with real-measured high-squint SAR data.