圆迹合成孔径雷达成像分辨率分析

摘要

研究提高雷达成像的分辨率,圆迹合成孔径雷达(Circular Synthetic Aperture Radar,CSAR)是一种特殊的曲线合成孔径雷达,能通过机载平台的圆迹巡航方式,对其中心的一片区域实现超高分辨率成像,并且具备一定的三维成像能力.针对新型的合成孔径形式,目前还缺乏一个统一的解析式来描述高度分辨率特性,给系统设计和论证带来不便.为解决上述问题,引入“归一化的模糊函数”,从一般的宽带信号模型人手,结合计算机的高速计算能力,对CSAR系统全空间分辨率进行了分析试验,得出了分辨率和飞行高度、系统带宽、系统载频以及目标位置之间的关系,结果有助于CSAR系统提高图像分辨率.%Circular Synthetic Aperture Radar(CSAR) was a special curvilinear synthetic aperture radar which could get very high horizontal resolution and ability of 3D reconstruction of its center space when the radar was moving along a circle. It brought some obstacles to the design of radar parameters because we were lack of a valid tool to analyze the space resolution. Then the " generalized ambiguity function" based on a common wide - band signal model and the high performance of computer's help was used to analyze the resolution of CSAR, which was necessary in this procedure. Then the relationship of radio frequency, band width, and navigating height to space resolution was indicated in this paper that can improve the system design.