摘要
为分析同波束干涉测量这一高精度相对测角技术对月球交会对接两个航天器的相对位置、速度(状态)影响,文章根据协方差分析理论及各测量量的模型,推导测量量关于相对状态量的信息矩阵,建立了相对状态误差协方差模型;结合月球轨道交会对接仿真轨道,开展测量误差对两个航天器的相对状态误差影响协方差分析。结果表明,在当前测量误差条件下,相对位置、速度误差分别达到米级和厘米每秒级。在分析相对状态误差影响因子的基础上,重点对同波束干涉测量差分相时延整周模糊误差及时延率误差对相对状态影响进行了分析,结果表明整周模糊度误差对相对位置误差影响显著,时延率误差对相对速度误差影响显著。
To establish steady relative navigation between two spacecraft in lunar orbit rendezvous and docking,accurate relative state determination between two spacecraft is needed in the long range ground based navigation.Same beam interferometry（SBI）,as a high precision technology for relative angle measurement,is of great sigficant in the relative state determination.However,the system method for analyzing the influence of SBI on the relative states of two spacecraft in lunar orbit rendezvous was not developed.The information matrix of measurements with the relative states was deduced according to the covariance theory,and the model of the relative states error covariance was established.The simulation results show that the relative position and velocity errors are within the meter and millimeter per second under the current range,range rate,VLBI and SBI measurement errors.The error and its influence was obtained,and the influence of cycle ambiguity error on relative state error was analyzed.The resutls show that the cycle ambiguity of SBI reduce from 2to 0,and the relative position error on T and Nis decreased greatly.
出处
《中国空间科学技术》
EI
CSCD
北大核心
2014年第5期32-40,共9页
Chinese Space Science and Technology
基金
探月工程重大关键技术研究专项(TY3Q20100009)资助项目
关键词
同波束干涉测量
相对状态
误差协方差
交会对接
月球探测
Same Beam Interferometry
Relative states
Error covariance analysis
Rendezvous and docking
Lunar exploration
