利用GPS系统确定小卫星姿态的一种算法

研究利用GPS系统确定小卫星姿态的方法，是GPS系统在航天器上应用的重要研究内容之一。针对微小卫星利用GPS系统进行载波相位姿态确定时存在的整周模糊度快速确定及简化姿态确定算法问题，给出了一种整周模糊度的快速确定方法，井在此基础上探讨了一种姿态求解的方法。仿真结果表明，所给算法理论简便实用，能够较好地用于微小卫星的姿态确定。

A Better Algorithm for Determining Attitude of Micro-Satellite Using GPS

Past methods for resolving integer ambiguity, which is key to determining attitude of micro satellite using GPS (global positioning system), are, in our opinion, too slow. We propose a better way of resolving integer ambiguity. Different from past algorithms, which search for resolution of integer ambiguity, we resolve it by making use of what is known about the difference of two position vectors of antenna baseline at two different instants; although only the position vector differences for three different GPS satellites are needed, we use position vector differences for many GPS satellites to make this resolving better.Section 1 explains in detail our way of resolving integer ambiguity.Section 2 explains an algorithm which we prefer to use in determining attitude of micro satellite using GPS; it is different from past algorithms and is applicable in the case of coplanar antenna configuration; some past algorithms such as NLLSFit and Wahba are not applicable in the case of coplanar antenna configuration. Simulation results, given in Figs.1, 2, and 3, show preliminarily that our proposed algorithm is effective in determining attitude of micro satellite using GPS.