Augmenting synthetic aperture radar with space time adaptive processing

Michael Riedl; Lee C. Potter; Emre Ertin

doi:10.1117/12.2019075

23 May 2013 Augmenting synthetic aperture radar with space time adaptive processing

Michael Riedl, Lee C. Potter, Emre Ertin

Proceedings Volume 8746, Algorithms for Synthetic Aperture Radar Imagery XX; 87460D (2013) https://doi.org/10.1117/12.2019075
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

Wide-area persistent radar video offers the ability to track moving targets. A shortcoming of the current technology is an inability to maintain track when Doppler shift places moving target returns co-located with strong clutter. Further, the high down-link data rate required for wide-area imaging presents a stringent system bottleneck. We present a multi-channel approach to augment the synthetic aperture radar (SAR) modality with space time adaptive processing (STAP) while constraining the down-link data rate to that of a single antenna SAR system. To this end, we adopt a multiple transmit, single receive (MISO) architecture. A frequency division design for orthogonal transmit waveforms is presented; the approach maintains coherence on clutter, achieves the maximal unaliased band of radial velocities, retains full resolution SAR images, and requires no increase in receiver data rate vis-a-vis the wide-area SAR modality. For N_t transmit antennas and N samples per pulse, the enhanced sensing provides a STAP capability with N_t times larger range bins than the SAR mode, at the cost of O(log N) more computations per pulse. The proposed MISO system and the associated signal processing are detailed, and the approach is numerically demonstrated via simulation of an airborne X-band system.

Citation Download Citation

Michael Riedl, Lee C. Potter, and Emre Ertin "Augmenting synthetic aperture radar with space time adaptive processing", Proc. SPIE 8746, Algorithms for Synthetic Aperture Radar Imagery XX, 87460D (23 May 2013); https://doi.org/10.1117/12.2019075

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