ground trace

A transcendental equation about the eccentric anomaly is proposed to compute the time windows between the J2 perturbed LEO satellite and the ground station, and this equation is solved by using the great circle to locally approximate the ground trace.

针对J2项摄动的LEO卫星与地面站通信链路，提出一种由偏近点角的超越方程计算时间窗口的新方法，采用以大圆近似星下点轨迹的方法求解此方程。

Non-linear equations are ( constructed) with the restriction of the satellite ground trace to resolve the unknown semi-axis and inclination, but it's too complicated to be resolved directly.

以轨道半径和轨道倾角为未知量依据星下点轨迹要求条件构建了非线性方程组，但直接求解过于复杂，采取迭代的方法解决。

The method of designing special elliptic orbit which was critical inclined, sun synchronous and repeating ground trace was expounded, and the calculation process of this method was summarized.

阐述了临界倾角太阳同步回归轨道这种特殊椭圆轨道的设计方法，总结了其轨道要素的计算步骤。