以太阳同步轨道为例,讨论了星载光学遥感器地面幅宽与轨道参数(特别是轨道高度)的关系,提出了满足星载光学遥感器地面幅宽要求的太阳同步轨道高度的选取方法。从地球非球形摄动理论的讨论开始,引出了太阳同步轨道的定义。通过引入假想交点的概念,推导出了交点周期、基本交点距与轨道高度的关系。基于上述讨论,得出了满足幅宽要求的轨道高度的约束条件。首次提出了假想交点这个概念,该概念的提出对太阳同步轨道相关理论的理解以及一些重要公式的推导有很大的帮助。推导出的太阳同步轨道交点周期与轨道半长轴的关系式已成功应用于某课题的太阳同步轨道设计中。

By taking Sun Synchronous Orbit(SS-O) for example,the relationship between swath width and orbital elements(especially the orbital altitude) was discussed,and a SS-O design method for satisfying the swath width requirement of space borne optical sensor was also given.The theory of non-spherical earth perturbation and the definition of SS-O were discussed.Then,the relationship among nodal period,fundamental interval and orbital altitude was educed by deriving the definitions of fictitious node.Finally,the restriction conditions of orbit altitude satisfying swath width requirement based on the discussion above were given.The definition of fictitious node very helpful to comprehend the theory on SS-O was first put forward.Furthermore,the mathematical relationship between SS-O nodal period and orbital semimajor axis was deduce,which has been available for SS-O design.