STK在太阳同步轨道降交点地方时仿真中的应用

The Sun-synchronous Orbit Simulation of Local Time of Descending Node by Using STK

理论分析了轨道半长轴和轨道倾角对太阳同步轨道降交点地方时的影响。通过STK大量仿真获得不同年份、月份相同地方时的太阳同步轨道降交点地方时漂移情况,并与理论漂移量进行比较,发现差异较大。提出了一种修正方法,缩小STK仿真与理论分析的差异,为利用STK进行降交点地方时控制或初始轨道的轨道半长轴、轨道倾角预偏置打下基础。

The effect of semi-major axis and inclination on the local time of descending node of Sun-syn- chronous orbit is analyzed. The orbit drift of local time of descending node within years and months can be obtained by STK and the simulative results and theoretic results are compared, then the contrasts show a great difference. A modification approach to the disparity reduction is presented, which lays a foundation for control of local time of descending node of Sun-synchronous orbit and applying bias to initial semi-major axis and inclination simulation using STK.