关于大行星（或月球）轨道器的冻结轨道

关于人造地球卫星的冻结轨道问题早已为人们所熟知，而且已有相应的卫星在轨运行。在考虑该冻结轨道形成时，主要依据地球扁率J3项与J2项的相对关系，这是由地球非球形引力场的特征所决定的，原理十分清楚，但其原理和结论不能随意地用于其他大行星(或月球)的轨道器。在一般情况下，对于低轨卫星形成冻结轨道的条件，非球形引力位中的奇次带谐项(J21 1，l≥1)将起重要作用。不仅仅是一个J3项，例如月球轨道器，J3，J5，J7和J9均有不可忽视的影响，而且与轨道倾角有一定的关系。为此，本文根据轨道理论对冻结轨道的存在性及其有关问题作进一步的分析，给将来的深空探测提供轨道设计的有关信息和依据。

The Frozen Orbit of the Orbiter of the Major Planet (or Moon)

It was known about the subject of frozen orbit of an artificial satellite, and there are some corresponding satellites running in their orbits. We mainly reference the relations between the earth oblateness J 3 and J 2 to study the formulating of frozen orbit, that is decided by the characteristics of earth nonspherical gravitational field. Even the theory is completely explicity, we should not optionally use these theories and conclusions to the spacecraft surrounding other major planet (or moon). In the general condition, the odd zonal harmonic terms(J 2l+1, l>1) in the nonspherical gravitational potential, not only J 3 term, will take significantly effect together to the formulating of frozen orbit of satellite in orbit. For example, to the moon spacecraft, the terms J 3, J 5, J 7 and J 9 should not be neglectable either, and the orbit obliquity also works relatively. Therefore, this essay ulteriorly analyses about the existence of frozen orbit and it's other concerned problems based on the orbit theory. We hope that we can offer information and basis about orbit design to interplanetary exploration in the future.