利用升交点经度进行轨道设计的方法

以升交点经度的范围来描述所有能覆盖到目标的轨道。利用球面三角方法详细讨论了在考虑地球形状Ｊ２项的摄动影响时，各种情况下能覆盖目标点的轨道的升交点经度范围，并将其推广到对区域目标的覆盖，给出了完整的解析表达式。结合实例给出了利用该表达式进行有连续覆盖、覆盖次数及过顶时间要求时的轨道设计方法。该方法的优点是无需进行轨道读物计算，仅用解析表达式即可快速地设计出满足覆盖要求的轨道。

METHOD FOR ORBIT DESIGN USING LONGITUDE OF ASCENDING NODE

All orbits by which targets can be covered are described according to the longitude of ascending node. This paper discusses in detail the range of longitude of ascending node of the orbits, by which point and area targets can be covered in different conditions by considering the disturbance of the earth shape J 2 using a sphere triangle method, and provides a whole analytic expression. It also introduces a method to design orbits, by the expression through living examples. The advantage of the method is that the orbit to meet the needs of coverage can be quickly and exactly designed only by the above analytic expression without orbit computation.