A Clutter Suppression Approach for SAR-GMTI Based on Dual-channel DPCA

Abstract

The Displaced Phase Center Antenna (DPCA) technology, a particular form of Space Time Adaptive Processing (STAP), has been widely used in Synthetic Aperture Radar Ground Moving Target Indication (SAR-GMTI). The GMTI performance depends on the capability of clutter rejection but the traditional DPCA technology operated in the complex image domain does not have the appropriate clutter rejection capability for urban areas with strong scattering stationary objects. Hence, interferometry phase is used to weight the DPCA magnitude nonlinearly, and a weighted DPCA clutter rejection approach is proposed, which reduces the interference from residual phase difference. The experimental results suggest that the new approach can improve the clutter rejection compared with the conventional DPCA.

Keywords

• Space Time Adaptive Processing (STAP)
• Displaced Phase Center Antenna (DPCA)
• Synthetic Aperture Radar (SAR)
• Ground Moving Target Indication (GMTI)
• Clutter rejection