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.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
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)
关键词
双站合成孔径雷达
距离向分辨率
自动合成
bistatic synthetic aperture radar
range resolution
auto-combination