低轨飞行器利用GPS定轨的算法研究

详细讨论了低轨飞行器利用ＧＰＳ系统定轨的原理和方法。分析了低轨飞行器选星时应考虑的问题，并根据导航星及用户模型进行了选星试验；探讨了利用最小二乘法进行解算定轨；详细分析了卡尔曼滤波算法，针对低轨飞行器提出了一个九状态卡尔曼滤波模型，并在此基础上进行了仿真模拟计算。另外，根据用户对电源能量和可靠性的特殊要求，提出了一种比较实用的定轨方法。仿真结果表明，提出的方法在精度上满足用户的要求，适合于工程实际应用。

ALGORITHM RESEARCH OF ORBIT DETERMINATION FOR LOW ORBIT SATELLITES USING GPS

The theory and method about determination of spacecrafts orbit using the GPS is discussed detail in this paper.The this includes these aspects:1)the special factors on the constellation selection of the low orbit satellite,2)determination of the orbit using the Least Square method,3)Kalman Filter model composed of nine states for the low orbit satellites.All of these aspect were simulated on the computer AST PA4/33. Baced on the particular raquests of the electrical power and reliability of the user'S satellite,a practical method of the orbit determination is put forword in this paper. According to the results of simulation, the accuracy of the method in this thesis satisfies the user's request.The method can be used in practical application.