A Multichannel Synthetic Aperture Radar (M-SAR) exploiting an antenna nulling based Electronic Counter-Counter Measures\n(ECCM) technique shall be able to cancel the effects of noise-like interferences over the collected SAR data. Since SAR systems\noften work with wide bandwidths to provide high resolution images, ECCM technique must account for the presence of wideband\ninterference signal. In this paper we consider a wideband antenna nulling technique based on space-frequency adaptive nulling\nand we propose an integration of the WB antenna nulling scheme within the focusing algorithm for M-SAR systems, thus allowing\na fusion between ECCM and usual SAR processing steps. The computational cost of the integrated algorithm is compared with\nthe cost of more traditional sequence of the wideband extension of the Side-Lobe Canceller and the focusing operation, to show\nthe computational feasibility of the proposed integrated algorithm. The possibility to perform suboptimally the space-frequency\nadaptive nulling is also considered
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