引言作为天地间往返运输系统的航天飞机、其任务是把有效载荷送到离地球表面某一高度的近地轨道——任务轨道,在那里实现与空间站的对接。本文假定了三个任务轨道,它们是离地面高度分别为300公里、400公里、500公里的圆形轨道。从经济方面考虑,航天飞机从起飞、爬升,直到完成向任务轨道的机动,常常要求 INTRODUCTION As a space shuttle to and from the transport system between heaven and earth, its mission is to send the payload to a near-Earth orbit-orbit at a certain altitude from the Earth’s surface, where docking with the space station is achieved. This article assumes three mission orbits, which are circular orbits at altitudes of 300 km, 400 km, and 500 km, respectively, from the ground. From an economic point of view, the space shuttle from take-off, climb, until the completion of maneuver to the mission orbit, often require