基于最大似然的X射线脉冲星空间定位研究  

X-ray Pulsars-based Spacecrafts' Position Determination Algorithm Based on Maximum Likelihood Estimation

作　　者：谢振华[1] 许录平[1] 倪广仁[2] 

机构地区：[1]西安电子科技大学电子工程学院,西安710071 [2]中国科学院国家授时中心,西安临潼710600

出　　处：《宇航学报》2007年第6期1605-1608,1642,共5页Journal of Astronautics

基　　金：国家自然科学基金(60472085);陕西省自然科学基金(2006F04)

摘　　要：为提高X射线脉冲星空间定位精度,讨论了脉冲TOA测量技术,解释了X射线脉冲星空间导航定位的时间参考原点定义;研究了基于最大似然估计的X射线脉冲星空间定位算法,以4颗X射线脉冲星源作为解脉冲周期模糊的最小运算单元,不断引入新的X射线脉冲星直至确定唯一的脉冲整周期数;选取5颗X射线脉冲星源,建立空间定位模型。仿真实验表明在半径约121309Km的球形试探范围内至少需要5颗脉冲星才能确定唯一的脉冲整周期数,结合最大似然估计可以有效提高空间定位精度。To improve precison of x-ray pulsars-based spacecraft's position determination,the technology of pulse time-of-arrival measurement was studied,and the origin of time-scale of TOA measurement was proposed.Then x-ray pulsars-based position determination algorithm based on maximum likelihood estimation was studied.4 x-ray pulsars were selected as an independent operation unit for pulse period ambiguity resolution.Then one of these 4 pulsars was substituted until exclusive pulse period number was worked out.We ...

关 键 词：天文导航 X射线脉冲星 脉冲到达时间测量 最大似然估计 解脉冲周期模糊 

分 类 号：P128.4[天文地球—天体测量]