GEO-UAV空天双基SAR二维分辨能力分析

收发平台分置于地球同步轨道（GEO）和无人机（UAV）的GEO-UAV空天双基合成孔径雷达（SAR）系统能够实现对重点观测区域高精度、高时相的观测，二维分辨能力为其重要的系统指标。针对GEO-UAV空天双基SAR的二维分辨能力进行了分析:首先，基于梯度法给出了空天双基SAR矢量化的二维分辨率的计算方法；其次，基于GEO-UAV空天双基SAR的构型计算了其距离分辨率、方位分辨率以及二维分辨矢量夹角；最后，基于系统的二维分辨能力提出了GEO-UAV空天双基SAR的构型设计准则，通过点目标仿真对该准则的有效性进行了验证。所提设计准则能够为GEO-UAV空天双基SAR的系统设计提供有力支撑。 

Two-dimensional resolution ability of GEO-UAV bistatic SAR

Mounted on the Geostationary Earth Orbit (GEO) and Unmanned Aerial Vehiclel (UAV) platforms, the GEO-UAV bistatic Synthetic Aperture Radar (SAR) can achieve precise and quick observation on the interested areas. The two-dimensional resolution ability is important performance metrics. The analysis on the two-dimensional resolution ability of GEO-UAV bistatic SAR is given. First, the calculation method of bistatic SAR vectored two-dimensional resolution based on the gradient method is given. Then, the range resolution, azimuth resolution and the angle between the azimuth and range vector are calculated according to the configuration of the GEO-UAV bistatic SAR. Finally, based on the two-dimensional resolution ability of the system, a configuration criterion for GEO-UAV bistatic SAR is proposed, which is verified via experiments on simulated point targets. The proposed configuration criterion is beneficial to the system design of GEO-UAV bistatic SAR.