基于条带式SAR与聚束式SAR内在联系的SAR成像研究

Study of SAR imaging based on internal relationship between stripmap SAR and spotlight SAR

针对条带式合成孔径雷达(stripmapsar)与聚束式合成孔径雷达(spotlightsar)的方位向频谱结构,讨论了两种模式SAR之间的区别与联系,利用两者之间的内在联系,提出斜视条件下将条带式SAR数据分块,进行聚束式处理的方法,并对聚束式成像区域大小参数的选择进行了分析。对于相同尺寸的成像区域,对条带式SAR进行聚束式处理可以减小运算量。采用空间频率插值成像算法实现了条带式SAR与聚束式SAR成像算法上的统一,最后应用外场实测数据完成成像,成像结果证实了理论分析的正确性。

Based on azimuth spectrum structure of stripmap SAR and spotlight SAR, the difference and relationship of two kinds of SAR are discussed in the paper. Through internal relationship between two kinds of SAR, the method which adopts spotlight process of stripmap SAR data on the squint condition is presented. Choosing parameters of the spotlight imaging area is also analyzed. For the same area, spotlight process of stripmap SAR data could decrease the cost of computation. The spatial frequency interpolation algorithm unifies imaging algorithm of both stripmap SAR and spotlight SAR. Finally, real data is utilized to make imaging, the theoretical analysis discussed in the paper is verified by the imaging results.