An algorithm for upsampling spotlight SAR imagery: a Radarsat-2 SLC perspective

Khalid El-Darymli; Peter McGuire; Desmond Power; Cecilia Moloney

doi:10.1117/12.2011151

23 May 2013 An algorithm for upsampling spotlight SAR imagery: a Radarsat-2 SLC perspective

Khalid El-Darymli, Peter McGuire, Desmond Power, Cecilia Moloney

Proceedings Volume 8746, Algorithms for Synthetic Aperture Radar Imagery XX; 874607 (2013) https://doi.org/10.1117/12.2011151
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

This paper presents a novel algorithm for upsmapling level-1 processed (i.e., focused) Spotlight SAR imagery. A Spotlight Radarsat-2 single look complex (SLC) image for ground-truthed vehicle targets in Long-Harbour, Newfoundland (Canada) is used to demonstrate the applicability of our proposed algorithm. To achieve a finer resolution in the azimuth direction, the Spotlight imaging mode allows for a controllable steering of the radar antenna towards the same ground position. In effect, this creates a time-varying Doppler centroid system, wherein the Doppler centroid varies almost linearly with the platform velocity. Although the focused Spotlight Radarsat-2 SLC imagery is delivered referenced to zero-Doppler, linear variations in the Doppler frequency are preserved along the range direction around the zero-Doppler line. The impact of this effect on SAR image upsampling is pinpointed and accounted for in our proposed upsampling algorithm.

Citation Download Citation

Khalid El-Darymli, Peter McGuire, Desmond Power, and Cecilia Moloney "An algorithm for upsampling spotlight SAR imagery: a Radarsat-2 SLC perspective", Proc. SPIE 8746, Algorithms for Synthetic Aperture Radar Imagery XX, 874607 (23 May 2013); https://doi.org/10.1117/12.2011151

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KEYWORDS

Synthetic aperture radar

Doppler effect

Image processing

Stanford Linear Collider

Detection and tracking algorithms

Radar

Antennas

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