轻小型SAR卫星平飞模式设计

Design of Translational Invariant Mode Based on Small SAR Satellite

对于轻小型合成孔径雷达(SAR)卫星在轨使用时对重点区域多目标观测效能提升的需求,提出轻小型SAR卫星平飞模式设计方法。介绍了卫星平飞模式设计方法,提出载荷平面相控阵天线距离维大角度扫描能力设计;针对区域多目标,提出条件触发方式目标决策策略,以及星上雷达工作参数计算策略;基于建立的目标决策和任务规划模型,分别针对卫星左侧视、在侧视、平飞、左右机动侧视等4种工作模式下进行多目标观测效能评估仿真分析。结果表明:相比于卫星斜飞模式下,平飞模式目标观测效能可提升至41%;相比于卫星左右机动侧视模式下,平飞模式目标观测效能可提升至73%。因此,设计的卫星平飞模式可有效提升面向区域多目标的观测效能。

In response to the requirements for improving the emergency observation efficiency of multiple targets of in-orbit small synthetic aperture radar(SAR)satellites in key areas,a design method for the translational invariant mode based on small SAR satellites is proposed.First,the design method is introduced,and the range dimension and large angle scanning capability of loaded planar phased array antenna are designed.Then,in view of regional multiple targets,a conditional trigger target-decision strategy and an on-board radar working parameter calculation strategy are proposed.Finally,based on the task-decision strategy and the task-planning model established in this paper,the simulation analyses of multi-target observation efficiency evaluation are carried out in four working modes,respectively,i.e.,left view,side view,translational invariant,and left and right maneuvering side view.The results show that compared with the side view mode,the target observation efficiency of the translational invariant mode can be improved to 41%.Compared with the left and right maneuvering side view mode,the target observation efficiency of the translational invariant mode can be improved to 73%.Therefore,the translational invariant mode designed in this article can effectively improve the observation efficiency towards regional multiple targets.