基于射线跟踪法的SAR图像相干仿真与评估  

SAR IMAGE COHERENT SIMULATION AND EVALUATION BASED ON SBR

作　　者：聂春霞[1] 孔莹莹[1] 

机构地区：[1]南京航空航天大学电子信息工程学院,江苏南京211106

出　　处：《计算机应用与软件》2017年第5期168-174,199,共8页Computer Applications and Software

基　　金：国家自然科学基金项目(61501228);航空科学基金项目(20152052029);江苏省自然科学基金项目(SBK2014043002)

摘　　要：由于直接根据射线跟踪法进行SAR图像仿真时未考虑周围各点散射量之间的相互影响,提出一种基于射线跟踪法的相干仿真算法并引入四种仿真图像逼真度的评估方法。首先利用射线跟踪法得到成像的幅度矩阵;其次,利用sinc函数旁瓣加权对幅度矩阵进行相干仿真,并引入PCA相似度、SIFT特征匹配率、变化检测率、目标视场比差值来衡量SAR图像仿真逼真度;最后通过仿真SAR图像与实测SAR图像的比对,验证了该相干仿真的图像比射线跟踪法直接成像的图像逼真度要高。Since the SAR image simulation directly based on SBR does not take into account the interaction between the surrounding scattered points,a coherent simulation algorithm based on SBR is proposed and four kinds of simulation image fidelity evaluation methods are introduced. Firstly, the amplitude matrix of imaging is obtained by SBR.Secondly,coherent simulation is conducted on the imaging amplitude matrix by the sum of the side-lobe of Sinc function,and the PCA similarity,SIFT feature matching rate,change detection rate and difference-value of target rate field of are verified by experiments are introduced to measure the fidelity of SAR image. Finally,by comparing the SAR image with the measured SAR image,it is verified that the coherence simulation image of this paper has higher image fidelity than the SBR.

关 键 词：射线跟踪法 SAR图像 相干仿真 仿真逼真度 

分 类 号：TP753[自动化与计算机技术—检测技术与自动化装置]