分布式卫星双基SAR分辨特性分析

Analysis of Geometry Resolution Characteristics of Distributed Satellites Bistatic SAR

由于分布式卫星的轨道特点及SAR成像特点所致,分布式卫星双基SAR在一定条件下可近似认为是一种信号发射器与接收器平行运动的双(多)基SAR。该文结合分布式卫星双基SAR的这一特点,应用梯度的概念就分布式卫星双基SAR几何分辨率、分辨方向、分辨单元几何特性等问题进行了研究;以视角、斜视角函数的形式给出了任意基线构型下分布式卫星双基SAR的几何分辨率、分辨方向的表达式;并研究了分布式卫星基线对分辨特性的影响。

Distributed satellites bistatic SAR can be transmitters and receivers move in parallel. Based on considered as a kind of bistatic/multi-static SAR system, whose this, in this paper, the geometry resolution of distributed satellites SAR is analyzed using the concept of gradient. The formulas of resolution characteristics, such as geometry resolution, the direction of resolution vector and the area of resolution cell, are deduced in the form of look angle and squint angle＇s functions. In addition, the influence of satellite＇s baselines on the geometry resolution is also discussed, and the simulated results are also provided here.