基于分辨椭圆的前斜SAR分辨率分析方法

摘要

The diving squinted SAR (Synthetic Aperture Radar ,SAR) has the feature of non-uniform resolution in different direction .The resolution description is seriously restricted in the traditional SAR ,which is not applied to the analysis of resolution in the diving squinted SAR .In order to illustrate a complete description of the resolution characteristics ,a method of resolution analysis of squinted SAR based on distinguishable ellipse is presented .The expression of distinguishable ellipse on the slant and ground plane is derived respectively by GAF (Generalized Ambiguity Function ,GAF) .The simulation results show that this method is adaptive to the conditions of different geometry and system parameters ,which can provide a theoretical basis for the design of system parameters and geometry configuration in squinted SAR .%俯冲前斜SAR（Synthetic Aperture Radar ，SAR）具有各方向分辨特性非均匀的特点，传统的合成孔径雷达分辨率描述方法具有一定的局限性，不适用于俯冲前斜SAR的分辨率分析。为了完备地描述前斜SAR系统的分辨率特性，提出了一种基于分辨椭圆的前斜SAR分辨率分析方法，采用广义模糊函数推导了前斜SAR斜平面和地平面分辨椭圆的表达式。仿真结果表明：该方法可以适应SAR系统不同的几何构型和系统参数条件，为前斜SAR系统的参数设计和几何构型配置提供了理论依据。