A Modified FSA Technique Using Full-aperture for SAR Spotlight Mode

Abstract

In this paper, a modified FSA(Frequency Scaling Algorithm) is proposed for KOMPSAT-5 high-resolution SAR image generation. In order to enhance performance of azimuth compression, degraded in sub-aperture processing due to the imperfect geometric parameter of data acquisition, the full-aperture signal processing algorithm is designed based on the exact time-frequency analysis. In addition, an azimuth scaling function is newly devised to make the full-aperture processing algorithm suitable for KOMPSAT-5 sliding-spotlight mode. Different from the previous sub-aperture FSA schemes, the suggested technique could accommodate the merit of unified signal processing structure regardless of operational modes of KOMPSAT-5. Through the point target simulation, it is verified that the suggested algorithm provides superior performance of azimuth compression over the existing full-aperture processing methods. The experimental results using real data acquired by are also given to demonstrate the effectiveness of our scheme as well. 초 록본 논문에서는 아리랑 5호의 고해상 SAR(Synthetic Aperture Radar) 영상 생성을 위해 수정 된 주파수 스케일링 알고리듬(FSA: Frequency Scaling Algorithm)을 제안한다. 부 개구면