双站SAR的海面速度聚束调制机理研究  

A Study on Bistatic SAR Velocity Bunching Modulation of Ocean Surface

作　　者：余颖[1,2] 王小青[1] 朱敏慧[1] 肖疆[1] 

机构地区：[1]中国科学院电子学研究所微波成像技术国家重点实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《电子与信息学报》2008年第12期2840-2843,共4页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(40706063)资助课题

摘　　要：为了利用双站SAR对海洋进行研究,首先必须正确理解双站SAR对海面成像的调制机理。而速度聚束调制是SAR所特有的调制机理。该文推导出平飞斜视情况下双站SAR图像平面中方位向强度变化表达式,定量地描述了目标方位位置偏移量和方位向分辨率的下降程度。并在线性近似条件下,求得双站SAR的线性速度聚束调制传递函数。通过仿真分析,定性地给出载机观测条件对双站SAR海浪线性成像范围大小的影响。In order to develop bistatic SAR ocean investigation, the first issue is the study of bistatic SAR ocean surface imaging mechanism. And velocity bunching mechanism is a SAR inherent modulation. Thus, the intensity expression in the bistatic SAR image plane is derived in this paper. The expression describes quantificationally the displacement of the scatter elements in the image plane and a degradation in radar resolution in azimuthal direction. In addition, a bistatic SAR linear velocity bunching transfer function is obtained in the linear parameter regime. Finally, this paper analyzes qualitatively the effects that various platform observation conditions have on the bistatic SAR linear imaging range of wave spectrum.

关 键 词：双站SAR 海面 速度聚束调制 观测条件 

分 类 号：TN959.72[电子电信—信号与信息处理]