23 May 2013 An algorithm for upsampling spotlight SAR imagery: a Radarsat-2 SLC perspective
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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.
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Khalid El-Darymli, Khalid El-Darymli, Peter McGuire, Peter McGuire, Desmond Power, Desmond Power, Cecilia Moloney, 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); doi: 10.1117/12.2011151; https://doi.org/10.1117/12.2011151

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