利用X射线源实现航天器相对定位  

Spacecraft Relative Positioning Using X-ray Source

作　　者：毛悦[1,2] 宋小勇[2] 贾小林[2] 吴显兵[2] 

机构地区：[1]信息工程大学测绘学院,郑州450052 [2]西安测绘研究所

出　　处：《空间科学学报》2009年第5期508-514,共7页Chinese Journal of Space Science

摘　　要：利用X射线源实现航天器相对定位,突破了X射线脉冲星绝对定位中需要选取具有稳定周期脉冲星的限制,通过周期脉冲信号及非周期时变信号互相关时差测量仿真试算,得出信号变化幅度是影响时延测量精度的重要因素。在分析测距和星历误差对相对定位精度影响的基础上,利用脉冲星数据库中提供的脉冲星参数,对同时观测3～6颗脉冲星的相对定位精度进行了试算。The basic principles of spacecraft relative positioning using X-ray source are presented in this paper. This method can break through the restriction of X-ray pulsar absolute positioning which must select steady periodical pulsars. Time differences are simulated using cross-correlation periodic pulse signal and aperiodic changing signal. Results can be derived from the fact that the change amplitude of signals have significant influence on the precision of time difference measurement. The influences of range and ephemeris error on position precision are analyzed. Relative positioning preeisions are calculated by simultaneously observing three to six pulsars which parameters are taken from the pulsar database.

关 键 词：X射线源 相对定位 DOP 互相关 

分 类 号：V448.22[航空宇航科学与技术—飞行器设计]