Phase Mismatch Calibration for Multichannel Sliding Spotlight SAR Imaging with Extended Azimuth Cross Correlation

Abstract

Multichannel in azimuth synthetic aperture radar (SAR) operating in sliding spotlight imaging mode serves as an promising tool to achieve very-high resolution and wide-swath imaging of the earth surface. This paper investigates the aspect of phase mismatch calibration for multichannel sliding spotlight SAR imaging, and an extended azimuth cross correlation method is proposed to deel with the influence of beam rotation in azimuth. Processing with experimental data obtained by a C-band dual-channel sliding spotlight airborne SAR shows the effectiveness of channel phase mismatch cancellation.