敏捷卫星立体成像覆盖能力分析

摘要

成像幅宽确定时,敏捷卫星的覆盖能力仅取决于成像条带长度.根据敏捷卫星的立体成像过程,推导出基于圆形地球模型星下点轨迹下的立体成像条带长度通用公式,分析了敏捷卫星实现立体成像的最小机动能力需求,并推导出立体成像条带长度所对应的姿态机动能力需求通用公式.基于某卫星典型姿态机动能力进行实际应用分析,得到轨道高度、俯仰预置角、立体观测视角数量等因素对其影响规律.分析结果表明:在其他条件相同时,轨道高度增加或俯仰预置角增大,均会带来立体成像条带长度增加,双视立体成像获取的条带长度也大于三视立体成像.文章采用的分析方法和推导出的相关公式,可为敏捷卫星的总体分析设计提供参考.%The coverage ability of agile satellite only depends on mapping strip length when swath is determined.According to the stereo mapping process of agile satellite,the general equation of stereo mapping strip length based circular earth model and satellite ground track is deduced,the minimum maneuver ability requirement of agile satellite for stereo mapping is analyzed,and the general equations of attitude maneuver ability requirement for stereo mapping strip length are de duced.Based on typical attitude maneuver ability of some satellite,one application is analyzed,and the effective rules of orbital altitude,preset pitch angle and stereo mapping angel number are obtained.Simulation results show that the increase of orbital altitude and preset pitch angle will result in the increase of stereo mapping strip length with the same other conditions,and the strip length of double-view stereo mapping is longer than three-view stereo mapping.The analysis method and the formula in this paper can provide a reference for system analysis and design of agile satellite.