| The Correcting Algorithm on Geometric Distortion of Polar Format Algorithm |
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Hankil Lee, Donghwan Kim, Inhye Son |
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The 3rd Research and Development Institute, Agency for Defense Development |
| PFA의 기하 왜곡 보정 기법 |
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이한길, 김동환, 손인혜 |
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국방과학연구소 제3기술연구본부 |
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| Abstract |
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Polar fomat algorithm (PFA) was derived from medical imaging theory, known as back projection, to process synthetic aperture radar(SAR) data. The difference between the operating condition of SAR and back projection assumption makes two distortions. First, the focusing performance of PFA is degraded in proportion to distances from the scene center. Second, the geometric accuracy in SAR images is distorted. Several methods were introduced to mitigate the distortions, but some disadvantages, such as the geometric discontinuity, are arisen when sub-images are combined. This paper proposes the novel method to compensate the geometric distortion with chirp Z-transform (CZT). This method corrects precisely the geometric errors without any problems, because a whole image can be processed all at once. |
| Key Words:
Synthetic Aperture Radar, Polar Format Algorithm, Geometric Distortion |
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