Phase Mismatch Calibration for Dual-Channel Sliding Spotlight SAR-GMTI

This article investigates channel phase mismatch calibration during the application of displaced-phase-center antenna (DPCA) in dual-channel sliding spotlight synthetic aperture radar (SAR) for ground moving target indication (GMTI). In SAR, utilization beam progressive sweeping azimuth causes centers to be misaligned from sensor path, resulting between channels. Then, spatial co-registration required DPCA cannot achieved directly by an time shift. this study, a method based on scanning geometry SAR is developed address issue. Moreover, effect estimation difference two channels derived and analyzed depth. The clutter suppression results processed experimental data acquired C-band system (Gaofen-3) operated mode are shown first demonstrate effective calibration.