GEO卫星波束指向地面轨迹的计算与应用

摘要

由于受到各种空间因素的影响， GEO卫星通常工作在小倾角轨道，通过姿态偏置控制可以维持卫星多波束天线的中心视轴对地指向点固定，但除视轴外的其他波束中心以天为单位，进行周期性移动，在工程中会造成地面站指向偏移，影响卫星多波束资源的使用。通过理论分析与公式推导，给出了卫星多波束天线中任意波束中心指向地面轨迹的解算过程，并对其进行了仿真计算与分析，可以作为实际工程应用的理论参考。%Due to influence of various spatial factors,the geostationary orbit satellite usually works on the inclined geostationary orbit.The boresight of satellite multi⁃beam antenna direction is fixed by the attitude control system.Except boresight,the center of other beam drift periodically,resulting in beam pointing offset and influencing satellite resource utilization. By theoretic analysis and deriva⁃tion,the calculation process of satellite beam pointing track on the ground is given.The simulation results show that this method can be used as theoretic reference in practice.