中文摘要：

针对星载GNSS接收机的采样间隔较长以及EKF处理非线性问题会引入线性化误差的问题,提出了利用UKF进行GEO星定轨计算的方法。依照GEO轨道动力学特性建立了状态模型,并对星载接收机进行了可见性分析,将UKF算法应用于接收机输出信息的处理。仿真结果表明该算法比EKF更适用于定轨计算,尤其当因采样间隔较长而使得系统非线性较强时,仍可保证定轨结果拥有较高的精度。

英文摘要：

The method to determine the GEO satellite orbit by UKF is proposed in this paper to overcome the long sampling interval of the GNSS receiver in orbit and eliminate the linearization error which is introduced when EKF deals with nonlinear problems.The Unscented transformation is applied in order to obtain some sampling points.The state model is established in accordance with the dynamics characteristics of GEO.The visibility analysis is conducted for the satelliteborne receiver.The UKF algorithm is applied to the processing of the output information coming from the receiver.The simulation results show that the algorithm is more suitable for the orbit determination calculation than EKF.Especially,the algorithm can still guarantee the high accuracy of orbit determination when the system nonlinear is more obvious due to the long sampling interval.