The dynamics of the relative motion between two nearby spacecraft is investigated in a local orbitalcoordinatesystem. It' has been pointed out that an equilibrium state may exist in the motion;
采用本地轨道坐标系对两邻近飞船间相对运动动力学展开研究，指出在相对运动中也存在平衡状态；
2
Under a Lagrange coordinatesystem the trajectory of particles was tracked by the use of a random orbital method.
在拉格朗日坐标系下，用随机轨道法跟踪颗粒的轨迹。
3
The equation of satellite orbital motion was derived in the conventional terrestrial coordinatesystem.