【作者】 赖涛； 韦海军； 董臻； 梁甸农；

【Author】 Lai Tao,Wei Hai-jun,Dong Zhen,Liang Dian-nong (College of Electronic Science and Engineering,National Univ.of Defense Technology,Changsha,410073,China)

【机构】 湖南长沙国防科技大学电子科学与工程学院二所空间微波探测教研室；

【摘要】 针对双站星载合成孔径雷达中一个站发射,另一站多个相位中心接收的几何结构,在分析了各相位中心回波历程之间的关系,得出结论为:若以最靠近发射站的接收相位中心的回波为参考,则其他相位中心的回波在补偿一个常数相位后,可以认为是参考回波的延时。基于此提出将双站多相位中心成像转化为双站成像的思想,具体方法为,根据各相位中心组合回波信号具有周期非均匀采样的特性,采用谱分解法来重建无方位模糊回波,然后采样传统成像算法完成成像。更多还原

【Abstract】 A space-borne bistatic SAR formation with one transmitter and multiple receivers located on one satellite or more is researched in this paper.Through analyzing correlations of echoes from multiple phase centers,a conclusion is draw as follow on the condition of certain imaging geometry.If the echo from the PC nearest to the transmitter is selected as reference echo,it is taken for that echoes from other PCs can be obtained from reference echo by delayed appropriately and sampled with PRF.So the echo combined by all echoes of all PCs is a periodic nonuniform sampled signal.Based on this conclusion,an approach which based on theory of periodically nonuniform sampling of band-pass signals is presented to reconstruct unambiguous SAR echo,then the approach is proved to be validity by simulation trials.更多还原