基于波束形成原理的SAR三维成像算法

Three-dimensional SAR imaging algorithm based on beam-forming principle

合成孔径雷达(SAR)三维成像能解决SAR二维成像中的叠掩、顶底倒置等几何失真问题,在军事侦察、灾害预测、资源调查和地形融合等领域具有广阔的应用前景.本文基于波束形成原理开展了SAR三维成像方法研究,通过在航迹向及跨航向上同时进行数字波束合成,实现对观测目标的三维分辨成像,分析了距离近似条件对三维成像处理的影响并验证其正确性,通过仿真实验数据验证了本文模型及算法的有效性及正确性.

Three-dimensional synthetic aperture radar（ 3D SAR） imaging has the advantage of solving the problems of geometric distortions in 2D SAR imaging,such as layover and top-bottom inversion. The 3D SAR imaging has wide application prospects in military reconnaissance,disaster prediction,resource investigation,and terrain fusion. The 3D SAR imaging method is studied based on beam-forming principle in this work,and digital beam-forming is used in the azimuth and crosstrack directions simultaneously to realize the 3D SAR imaging of the observed target. The distance approximation condition for 3D imaging processing is analyzed and its correctness is verified. Finally,the effectiveness and correctness of the model and algorithm are verified by the simulation data.