自适应滤波在环火探测器脉冲星自主导航中的应用  

Autonomous Navigation of Mars Probe Using X-ray Pulsar Based on a Modified AEKF

作　　者：魏二虎[1,2] 张帅[1] Wei Jianan 

机构地区：[1]武汉大学测绘学院,湖北武汉430079 [2]地球空间信息技术协同创新中心,湖北武汉430079 [3]新南威尔士大学建筑环境学院

出　　处：《武汉大学学报（信息科学版）》2015年第5期701-705,共5页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(41374012);武汉大学测绘学院2012年本科专业综合改革教学研究项目(201220);国家863计划资助项目(2008AA12Z308)~~

摘　　要：脉冲星自主导航技术能够提供连续、高精度的导航定位信息和高精度的时间标准,能为深空和星际飞行器的自主导航提供有效技术支撑。针对如何提高环火探测器自主导航的精度,并为其提供快速、可靠的导航信息,本文设计了一款自适应扩展卡尔曼滤波器(AEKF)滤波器。仿真数值实验表明,探测器的三个轴向位置精度能够迅速收敛,X轴向收敛精度优于1 000m,Y、Z轴向收敛精度优于350m;三个轴向速度精度也能经过数十个历元后稳定在0.05m/s以内。此外,AEKF能够有效克服滤波初始状态偏差的影响,较快地获得相当精度的状态估值。Autonomous navigation with X-ray pulsar can provide continuous and high-precision autono- mous navigation information and high-precision time, and standard for the deep space probe and inter- stellar vehicle. In order to study how to improve the autonomous navigation accuracy and acquire reli- able navigation information quickly of the Mars probe, a modified adaptive extended Kalman filtering （AEKF） is studied. Results of the numerical experiment show that the three-dimensional positioning accuracy can achieve 1 000 m in X-axis, 350 m in Y-axis and 350 m in Z-axis. The three-dimensional velocity accuracy is stable within 0.05 m/s. Moreover, the AEKF can effectively overcome the influ- ence of the initial state deviation and achieve a good estimate value of the state.

关 键 词：自适应扩展卡尔曼滤波 环火探测器 X射线脉冲星 自主导航 

分 类 号：P228.1[天文地球—大地测量学与测量工程]