卫星星下点

基于OpenGL的卫星星下点轨迹可视化仿真

Visual Simulation of the Track of Sub-Satellite Point by Using OpenGL

使用等距墨卡托投影，将卫星的星下点轨迹绘制在地球平面图上。

The track of sub-satellite points are drawn on the ichnography of the earth with the projection of Mercator .

轨道维持的任务是将卫星的星下点轨迹保持在设计的参考轨迹附近。

The ground tracks of satellites required for mission should be maintained close to those of reference orbits over the lifetime of satellites .

轨道偏离赤道平面的同步卫星，其星下点（或视位置）的口漂移轨迹址对称于静止位置的8字形。

When the geostationary satellite orbit deviates from equatorial plane , the day-drift trace of it 's sub-satellite point ( or apparent place ) is a " 8 " - shape pattern symmetrical about the stationary position .

实现了在全球卫星影像地图上卫星的星下点轨迹的绘制和显示，以及覆盖区域的显示；

Realize the render and display of subastral point tracks on the global satellite images . Also include the display of satellite coverage ;

根据GEO卫星的线性化状态转移方程，通过设定地面跟踪网坐标和卫星星下点经度计算叠加矩阵，由观测弧长和采样间隔直接计算定轨精度评定公式中的主要部分。

The superposition matrix was computed by setting coordinate of ground tracking net and satellite ground longitude according to the linear state transfer equation of GEO satellite . The main part of the evaluation equation for orbit determination accuracy was calculated by observation arc and sampling interval .