共享星位式静止轨道卫星群构形简析

共享星位式静止轨道卫星群（Ｃｏ－ｌｏｃａｔｅｄＧｅｏｓｔａｔｉｏｎａｒｙＳａｔｅｌｉｔｅｓ）共占一个星位以完成对地通信任务。在这种共享星位的方式下每颗卫星间的位置差异很小，整个卫星群在经度和纬度方向上的允许偏差通常小于±０．１°。在这个范围内必须对卫星精确控制。经典的Ｃ－Ｗ方程形式简单，便于分析，但它的结果不能精确地反映卫星的相对运动，因而不宜用来研究共位式静止卫星群的几何构形及其控制。作者给出了一组修正的Ｃ－Ｗ方程以弥补其不足；并且根据卫星群偏心率与倾角综合的分离思想，讨论了两种策略，使得卫星群的构形可通过每个成员的轨道要素简单表出。适当调整每颗卫星的轨道要素可以保持卫星群的构形在空间不变，或者对地（近赤道观测站）不变。

AN INTRODUCTION TO CONFIGURATION OF CO LOCATED GEOSTATIONARY SATELLITES

Co located geostationary satellites are described as a group of GEO satellites that share the same nominal longitude and a common control box of typical ±0 1° in latitude and longitude.It's convenient to study relative motions in a reference orbital coordinate system using Clohessy Wiltshire equation,provided that the reference orbit is a standard geostationary orbit.However,a set of modified C W equation is presented to avoid a defect of the original C W equation.The satellites follow a combined eccentricity and inclination vector separation strategy,so that the group geometry can be expressed simply by the orbital elements of each member.The group geometry in space (or reference to ground station)can be keeped unchanged with a simple modification of the orbital elements of each member.