机载下视圆周SAR三维BP成像

结合机载下视三维SAR和曲线合成孔径雷达(CSAR),提出了一种下视圆周SAR的三维成像结构。在此结构下推导回波信号模型,发现回波信号中切航向和沿航向存在二维耦合项,使得传统的RD算法、CS算法、距离徙动算法等受限。后向投影算法(BP算法)通过二维场景搜索,避免了回波模型中耦合项的影响。文中分析了圆周SAR三维BP成像的机理,并给出了整个成像过程的流程图。仿真结果表明,圆周SAR能够精确地还原场景目标的三维信息,从而验证了此种结构的可行性和理论分析的正确性。

Imaging of Downward-Looking 3D Circle-SAR by BP Algorithm

Combining downward-looking 3D SAR and CSAR,we put forward an imaging structure of downward-looking 3D circle SAR.Deducing the receiving signal model,we find that it has the coupling term in along-track and cross-track direction,so the traditional RD,CS and Range Migration algorithm can't be used in this situation.The Back Projection algorithm avoids dealing with the coupling term by two-dimensional scene searching.The principle of 3D circle SAR by BP algorithm is analyzed and the flow charts of the whole im...