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http://dx.doi.org/10.7780/kjrs.2011.27.2.151

PGA Implementation Technique for Stripmap SAR Signal Processing  

Yoon, Sang-Ho (ADD)
Koh, Bo-Yeon (ADD)
Kong, Young-Kyun (LIG Nex1)
Shin, Hee-Sub (LIG Nex1)
Publication Information
Korean Journal of Remote Sensing / v.27, no.2, 2011 , pp. 151-161 More about this Journal
Abstract
PGA(Phase Gradient Autofocus) is a representative autofocus technique to improve the SAR(Synthetic Aperture Radar) image quality. PGA can estimate high order phase errors and have good robustness in noisy environments. However, PGA is not suitable to apply to the stripmap mode data directly because it is based on the spotlight mode operation. In this paper, the PGA implementation technique for stripmap mode data and the method of ROI(Region of Interest) selection that affects severely on PGA performance have been proposed. The proposed technique was verified by the point target simulation first, and was applied to the real SAR signal data acquired by the flight test. Finally, the significant improvements in focusing quality were shown in the processed SAR images using the proposed method.
Keywords
PGA; SAR; Autofocus; Phase Error; Stripmap Mode;
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