大椭圆轨道SAR滑动聚束模式设计及斜距模型

针对大椭圆轨道合成孔径雷达存在大偏心率，时变轨道高度及时变卫星速度等特性，首次开展了大椭圆轨道SAR滑动模式设计研究.对大椭圆轨道SAR滑动聚束模式设计，考虑了不同轨道位置处不同分辨率改善因子、地面波束足迹一致性、天线扫描角度、天线扫描角速度等.对大椭圆轨道SAR滑动聚束模式回波斜距模型研究.仿真分析结果表明大椭圆轨道SAR滑动聚束模式参数需要随轨道位置变化进行调整，为了满足成像需求斜距模型需要展开到三阶. 

Sliding Spotlight Mode Design and Slant Range Model for Elliptical Orbit SAR

Focusing on the characteristics of large eccentricity, time-varying orbit height and satellite speed in elliptical orbit SAR, the sliding mode design was studied for large elliptical orbit SAR. Firstly, considering different resolution improvement factors at different orbital positions, ground beam footprint consistency, antenna scanning angle, antenna scanning angular velocity and so on, a sliding spotlight mode was designed for large elliptical orbit SAR. Then, the slant range model of gliding spotlight mode echo was studied. Finally, a simulation validation was carried out. The simulation results show that the parameters of sliding spotlight mode for elliptical orbit SAR need to be adjusted with the change of orbit position. In order to meet the imaging requirements, the slant model needs to be expanded to third order.