Integrated wideband antenna nulling and focusing technique for Multi-Channel Synthetic Aperture Radar

Abstract

The imaging capability of a synthetic aperture radar (SAR) could be seriously limited or denied by an electromagnetic noise-like interference signal impinging on the antenna during the synthetic aperture. A multi-channel SAR (M-SAR), exploiting an antenna nulling based electronic counter-counter measures (ECCM) technique, shall be able to cancel the effects of interferences over the collected SAR data. Since SAR systems often work with wide bandwidths to provide high resolution images, the ECCM technique must account for the presence of WB interference signal. In this paper we consider a WB antenna nulling technique based on a space frequency adaptive nulling and we propose an integration of the WB antenna nulling scheme within the focusing algorithm for M-SAR systems, thus allowing a fusion between ECCM and usual SAR processing steps.