Constrained fast-time STAP techniques for interference suppression in multichannel SAR

Abstract

Forming a Synthetic Aperture Radar (SAR) image while suppressing an airborne broadband jammer can potentially destroy large regions of the image. In addition to this, multipath reflections from the ground, known as hotclutter (HC) or terrain scattered interference will add a nonstationary interference component to the image. Using multiple antennas on a SAR provides spatial degrees of freedom and allows for adaptive beamforming to suppress the jammer signals. This paper presents a summary of constrained sub-optimal fasttime Space Time Adaptive Processing (STAP) techniques which reduce the interference level with minimal distortion to the SAR image.