箭载GNSS数据融合处理及精度分析

摘要

针对箭载GPS、GLONASS与北斗导航系统(BeiDou Navigation Satellite System,BDS)多星座导航接收机融合定位中多系统多星冗余信息的处理问题,研究了不同导航系统下观测数据的权值确定策略,给出了改进的简化Helmert方差分量估计方法,实现了箭载GNSS数据融合定位处理中观测数据的自适应定权,通过实测数据计算分析表明:该权值确定策略,能充分利用可用冗余卫星信息,提高定位结果的可靠性,对定位精度有明显改善,且计算量小,适用于运载火箭GNSS实时弹道确定.%For the multisystem and multisatellite redundance of observation data in on-board GPS、GLONASS and BDS constellation navigation system fusion positioning,the strategy of observation data weight determination on two different navigation system is researched,the improved method of simplified Helmert variance component estimation is presented in this paper,to realized the adaptive weight determination of observation data in on-board GNSS Fusion positioning.The calculation and analysis of the measured data show that the weight determination strategy can make full use of available redundant satellite information,and improve the reliability of the position results.This weight determination strategy has a significant improvement on the positioning accuracy and the calculation is small,and it is suitable for the real time on-board GNSS ballistic calculation.