EKF/UKF在基于地磁场的卫星自主定轨中的应用比较  

Compare on the Application of EKF/UKF in Satellite Autonomous Orbit Determination Using Geomagnetic Field

作　　者：王向磊[1] 丁硕 苏牡丹 

机构地区：[1]信息工程大学测绘学院 [2]61081部队 [3]63999部队

出　　处：《测绘科学技术学报》2011年第1期50-53,共4页Journal of Geomatics Science and Technology

基　　金：国家自然科学基金资助项目(40774031)

摘　　要：研究了基于地磁场的自主导航,建立了以卫星轨道动力学方程为基础的系统状态方程,并详细推导了以地磁场矢量为观测量时的观测方程。由于传统的卡尔曼滤波不能解决系统的非线性问题,因此把扩展卡尔曼滤波EKF和无迹卡尔曼滤波UKF引入到系统中;并用Matlab对基于地磁场的自主导航系统进行了仿真。仿真结果表明,UKF有更好的收敛性和稳定性。Autonomous navigation using geomagnetic field was studied.The system state equations based on the dynamic equation of satellite orbit were built,and the observation equations with geomagnetic field vector as the observable were derived in detail.The traditional Kalman Filter can not adapt to the system due to the nonlinear system,so the EKF and UKF method for nonlinear system were introduced into the autonomous navigation system using geomagnetic field;and the simulations were made on the autonomous navigation system using geomagnetic field with Matlab.The results of the simulations showed that the UKF has good performance in stability and convergence.

关 键 词：地磁导航 自主导航 扩展卡尔曼滤波 无迹滤波 地磁场模型 

分 类 号：P228[天文地球—大地测量学与测量工程]