中文摘要：

针对小卫星的一种安装、在轨二次发射方式,通过分析小卫星从母星释放过程中的GPS星座可用性,研究了小卫星的弹出旋转式在轨二次发射的可行性问题。首先,分析了小卫星对单颗GPS卫星可见的数学条件,然后导出了小卫星在二次发射从母星释放过程的三个不同阶段中对单颗GPS卫星可见的数学描述,最后研究了整个过程的GPS星座可用性,提出了一种保证释放过程中GPS星座可用的弹出时刻选取方法,并完成了数值计算验证。本文提出的选取方法,能够保证释放过程中GPS星座可用,避免释放过程中小卫星与母星发生意外碰撞的可能,从而证明了这种弹出旋转式在轨二次发射方式具有可行性。这一结论对我国小卫星在轨二次发射应用有参考价值。

英文摘要：

This paper studied the feasibility of a certain manner in which small satellite given a lift into outer space by our spacecraft was fixed to and separated on orbit from its mother ship. Usability of GPS constellation during small satellite＇ s separation was analyzed. First, a mathematics qualification on small satellite＇ s RHCP antenna visibility was analyzed. Second, a GPS satellite visibility mathematics model was studied during separation. In the end, based on these models, usability of GPS constellation was investigated. This paper proposes the method of choosing second launch moment, which ensures GPS constellation usable during separation. Therefore, small satellite can avoid colliding with its mother ship during separation, which proves our small satellite＇s second launch manner feasible. It can be an important reference to our small satellite＇s second launch application.