一种高轨SAR带宽与合成孔径时间的设计方法

发布时间：2019-04-27 02:23

【摘要】：高轨合成孔径雷达星地构型几何复杂,低轨合成孔径雷达系统设计中距离方位不耦合的假设不再成立,常规的带宽和合成孔径时间设计方法在高轨中不再适用.针对上述问题,提出了一种适用于高轨的系统带宽与合成孔径时间优化设计方法.首先根据高轨合成孔径雷达斜距平面与地距平面的几何映射关系,得到了解析的地表分辨率表示方法;然后针对实际应用对合成孔径雷达地表分辨率大小和形状(尽量接近圆)的要求,提出了一种信号带宽与合成孔径时间优化设计方法;最后以高轨椭圆轨道为例,给出了设计实例,分辨率分析结果与后向投影法成像结果吻合,同时给出了相应的带宽与合成孔径时间设计结果.仿真结果验证了文中方法在高轨合成孔径雷达系统设计中的有效性.
[Abstract]:The geometry of high-orbit synthetic aperture radar is complicated, and the assumption that range-azimuth is not coupled in the design of low-orbit synthetic aperture radar system is no longer valid. The conventional methods of bandwidth and synthetic aperture time design are no longer applicable in high-orbit. In order to solve the above problems, an optimal design method of system bandwidth and synthetic aperture time suitable for high orbit is proposed. Firstly, according to the geometric mapping relationship between the oblique range plane and the ground distance plane of high orbit synthetic aperture radar, an analytical representation method of surface resolution is obtained. Then a signal bandwidth and synthetic aperture time optimization design method is proposed to meet the requirements of practical application for the size and shape of synthetic aperture radar (SAR) surface resolution (as close to circle) as far as possible. Finally, taking the high orbit elliptical orbit as an example, the design example is given. The resolution analysis results are in agreement with the imaging results of the backward projection method, and the corresponding bandwidth and synthetic aperture time design results are also given. The simulation results verify the effectiveness of the proposed method in the design of high-orbit synthetic aperture radar system.
【作者单位】：西安电子科技大学雷达信号处理国家重点实验室;西安电子科技大学信息感知技术协同创新中心;
【基金】：国家自然科学基金创新群体资助项目(61621005)
【分类号】：TN958

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