Abstract
A Multichannel Synthetic Aperture Radar (M-SAR) exploiting an antenna nulling based Electronic Counter-Counter Measures (ECCM) technique shall be able to cancel the effects of noise-like interferences over the collected SAR data. Since SAR systems often work with wide bandwidths to provide high resolution images, ECCM technique must account for the presence of wideband interference signal. In this paper we consider a wideband antenna nulling technique based on 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. The computational cost of the integrated algorithm is compared with the cost of more traditional sequence of the wideband extension of the Side-Lobe Canceller and the focusing operation, to show the computational feasibility of the proposed integrated algorithm. The possibility to perform suboptimally the space-frequency adaptive nulling is also considered.
Highlights
The effect of a wideband (WB) noise-like interference for imaging radars is to mask the scene visible in the imaged area with a high uniform noise level [1,2,3]
In this paper we consider a wideband antenna nulling technique based on space-frequency adaptive nulling and we propose an integration of the WB antenna nulling scheme within the focusing algorithm for Multichannel Synthetic Aperture Radar (M-Synthetic Aperture Radar (SAR)) systems, allowing a fusion between Electronic Counter-Counter Measures (ECCM) and usual SAR processing steps
Since the proposed WB nulling technique operates a DFT on each set of fast-time samples collected on the available receiving channels, the main idea is to apply the cancellation algorithm to the whole set of samples collected by the SAR in the range domain at each Pulse Repetition Time (PRT), allowing an integration of the antenna nulling with a focusing technique working in the wavenumber domain, like, for example, the Range Migration Algorithm (RMA) [25] or the Range Doppler Algorithm (RDA) [26]
Summary
The effect of a wideband (WB) noise-like interference for imaging radars is to mask the scene visible in the imaged area with a high uniform noise level [1,2,3]. This integration between nulling and focusing techniques proves to allow an effective cancellation of the WB interference independently on the jammer equivalent isotropic radiated power (EIRP); differently from [27] where a side-lobe jammer with a high level EIRP was added to a very low noise contribution, two disturbance scenarios are investigated in the performance analysis section, where a single side-lobe jammer with two different levels of EIRP add to a severe noise contribution In both cases jammer appears to be rejected by the proposed integrated wideband nulling and focusing technique potentially recovering the computational cost with respect to the traditional cascade of WB-SLC and focusing depending on the interference characteristics.
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