| 1. | 2 . systems analyzed on the design principle of near - earth orbit , regression orbit , stationary orbit , critical orbit and construction orbit . base on this , a orbit design model is given 2 、系统研究了近地轨道、太阳同步轨道、回归轨道、静止轨道、临界和冻结轨道的设计原理,在此基础上,建立了轨道设计模型。 |