一种双站合成孔径雷达的高分辨率成像与合成方法  

Imaging and Auto-Combination Processing Technique for Bistatic Synthetic Aperture Radar

作　　者：钟华[1] 宋广华[2] 杜昌平[2] 

机构地区：[1]杭州电子科技大学通信学院,杭州310018 [2]浙江大学航空航天学院,杭州310027

出　　处：《上海交通大学学报》2014年第3期317-322,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(61301248);中国航空科学基金(20120576001);中国博士后科学基金面上项目(2011M501000)

摘　　要：针对合成孔径雷达难以提高系统固有分辨率,分析了双站合成孔径雷达之间的频谱关系,提出了一种距离向分辨率自动合成方法.基于该方法,双站合成孔径雷达高分辨率成像处理流程可以分为2步:首先,采用改进的双站非线性Chirp-Scaling算法得到高质量的子图像对;然后,利用子图像对之间存在的频谱偏移关系,利用分辨率自动合成算法将子图像对合成为分辨率更高的图像,从而完成双站合成孔径雷达的高分辨率成像处理.仿真结果表明,该处理技术及成像方法可以得到较好的高分辨率成像效果.To improve the inherent resolution of synthetic aperture radar （SA.R）, the relationship between the spetrums of bistatic SAR （BiSAR） was analyzed and a novel range resolution auto-combination method was proposed in this paper. Based on the proposed method, the whole procedure was divided into two steps： First, the raw echo of BiSAR was well focused by an modified nonlinear chirp scaling algorithm, where no interpolation was required. Secondly, an auto-combination technique based on image quality was introduced to combine sub-images into an improved resolution image. Simulation results show that this technique is effective and robust.

关 键 词：双站合成孔径雷达 距离向分辨率 自动合成 

分 类 号：TN958.04[电子电信—信号与信息处理]