摘要
对导航卫星广播星历参数拟合算法和接口设计问题进行了研究。通过条件数、参数相关性分析,指出小倾角问题是造成GPS开普勒轨道根数广播星历拟合算法不能适用于GEO卫星的最主要原因;通过分析定轨理论和拟合实例证明,GEO卫星星历参数Crc、Crs超限的主要原因是由于其轨道特性决定的;针对GEO卫星星历参数拟合法方程严重病态的问题,提出了动态加权的带参数约束条件平差算法。该方法能有效稳定星历拟合结果,解决Δn等星历参数超限的问题。
The engineering design for broadcast ephemeris parameters fitting arithmetic and their interface are studied.Through the analysis of normal equation by condition number and parameters relativity,the small inclination is protected to be the primary reason that causes the inapplicability of GPS Kepler orbit elements ephemeris fitting arithmetic to fit GEO orbit.And more,the characteristic of earth-stationary orbit leads the value of parameter Crc or Crs out of the GPS ephemeris interface limits,so they must be enlarged twice for GEO.At last,a new arithmetic,named parameters restriction adjustment with dynamic weighting,is proposed for morbid normal equation problem of navigation ephemeris fitting.The experiments show that the new arithmetic can stabilize the fitting results,limit all the ephemeris results within the interface bounds as well.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2011年第1期18-23,共6页
Geomatics and Information Science of Wuhan University
基金
国家863计划资助项目(2007AA12Z345)
国家教育部博士后科学基金资助项目(20080440092
200902259)
地球空间环境与大地测量教育部重点实验室开放研究基金资助项目(06-07
08-01-07)
关键词
天体测量学
广播星历
参数平差
条件数
相关性
astrometry
ephemeris
parameters adjustment
condition number
relativity
