Study on Squint Sliding Spotlight Mode SAR Imaging
Han Xiao-lei①② Li Shi-qiang① Wang Yu① Yu Wei-dong①
①(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ②(University of the Chinese Academy of Sciences, Beijing 100039, China)
Abstract：When the sliding spotlight mode SAR works in spaceborne squint case or airborne high-squint high- resolution case, the coupling between range and azimuth rises rapidly. It leads to a new two-dimensional (2-D) spectrum skew phenomenon. The skew extend the azimuth spectrum and enlarge the Doppler bandwidth, which causes a new azimuth spectral folding effect. The folding can not be eliminated by the conventional two-step processing algorithm. In this paper, a modified two-step processing algorithm is proposed. Efficiently implemented without large zero padding, it eliminates the effect of the 2-D spectrum skew. Therefore, the algorithm can process the data of squint sliding spotlight mode efficiently. The processing flow of the algorithm is described in detail, and compared with the conventional two-step processing algorithm. Finally, experiments on simulated and real data validate the effectiveness of the proposed algorithm in squint sliding spotlight case.
韩晓磊, 李世强, 王宇, 禹卫东. 斜视滑动聚束模式SAR成像算法研究[J]. 电子与信息学报, 2013, 35(12): 2843-2849.
Han Xiao-Lei, Li Shi-Qiang, Wang Yu, Yu Wei-Dong. Study on Squint Sliding Spotlight Mode SAR Imaging. , 2013, 35(12): 2843-2849.
2013, Vol. 35 
