分布式衛(wèi)星雙基SAR分辨特性分析
Analysis of Geometry Resolution Characteristics of Distributed Satellites Bistatic SAR
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摘要: 由于分布式衛(wèi)星的軌道特點及SAR成像特點所致，分布式衛(wèi)星雙基SAR在一定條件下可近似認為是一種信號發(fā)射器與接收器平行運動的雙(多)基SAR。該文結合分布式衛(wèi)星雙基SAR的這一特點，應用梯度的概念就分布式衛(wèi)星雙基SAR幾何分辨率、分辨方向、分辨單元幾何特性等問題進行了研究; 以視角、斜視角函數的形式給出了任意基線構型下分布式衛(wèi)星雙基SAR的幾何分辨率、分辨方向的表達式; 并研究了分布式衛(wèi)星基線對分辨特性的影響。Abstract: Distributed satellites bistatic SAR can be considered as a kind of bistatic/multi-static SAR system, whose transmitters and receivers move in parallel. Based on 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 angles functions. In addition, the influence of satellites baselines on the geometry resolution is also discussed, and the simulated results are also provided here.
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