CAJ | 학술논문

　　与传统的直线SAR相比，圆周SAR（CSAR）具有对场景进行三维成像的能力，但对于一般的目标，其有效孔径只是一定角度的圆弧而非完整圆周孔径，使得圆周SAR只能获得航迹向和斜距向的高分辨率，影响了其三维成像能力，所以现在通常采用沿着不同高度角进行多次观测的多航过圆周SAR模式来实现三维成像。针对多航过圆周SAR由于多航过稀疏并且非均匀采样而严重影响成像质量的问题，提出一种将BP算法和压缩传感算法（CS）结合的三维成像算法。该算法先利用BP算法实现每一次航过数据的二维成像，再利用压缩传感算法进行高度向聚焦，来改善高度向的聚焦质量，最后将实测数据成像结果和传统的三维BP算法的结果进行比较，证明该算法可以有效地抑制旁瓣，得到超分辨的三维成像结果。
　　여전통적직선SAR상비，원주SAR（CSAR）구유대장경진행삼유성상적능력，단대우일반적목표，기유효공경지시일정각도적원호이비완정원주공경，사득원주SAR지능획득항적향화사거향적고분변솔，영향료기삼유성상능력，소이현재통상채용연착불동고도각진행다차관측적다항과원주SAR모식래실현삼유성상。침대다항과원주SAR유우다항과희소병차비균균채양이엄중영향성상질량적문제，제출일충장BP산법화압축전감산법（CS）결합적삼유성상산법。해산법선이용BP산법실현매일차항과수거적이유성상，재이용압축전감산법진행고도향취초，래개선고도향적취초질량，최후장실측수거성상결과화전통적삼유BP산법적결과진행비교，증명해산법가이유효지억제방판，득도초분변적삼유성상결과。
The Circular Synthetic Aperture Radar (CSAR),unlike the linear SAR,has the capability to extract three-dimensional imaging information of a target scene. Its effective aperture is not the whole circular aperture but an arc for general target. This causes CSAR to only own the high resolution of along-track direction and slant-range direction,and the three dimension imaging ability is weak,so multi-pass CSAR is adopted to realize three dimensional target construction. According to the problem that multi-pass CSAR usually has sparse and non-uniform elevation samples,this paper proposes a three-dimension image formation algorithm based on the combination of Back Projection (BP)and Compressed Sensing (CS). The algorithm first uses BP algorithm to realize the two-dimensional image of single-pass data,and then uses CS algorithm to focus height dimension,to improve the high quality of the focus. Finally the measured data with the proposed algorithm is compared with the results of the proposed algorithm and BP algorithm′s to prove that the proposed algorithm can effectively in-hibit side-lobe and improve the resolution.