一种多系统组合单点定位随机模型的确定方法

摘要

Analysis is made on the Multi-GNSS Single point positioning performance and stochastic models.As to the accuracy of stochastic model in combined positioning,a method combining prior weighting based on UERE and posterior weighting based on variance estimation is proposed.Experimental results show that:compared with single-system,Multi-GNSS has more available satellite in single epoch and smaller GDOP,which makes the positioning accuracy,integrity,availability and other navigation performance greatly improved;compared with prior weighting or posterior variance estimation weighting,the weighting method can effectively improve the accuracy of Multi-GNSS positioning and reduce the number of iterations.%分析多系统组合单点定位性能,针对组合定位时随机模型不够精确的问题,提出一种基于UERE的Helmert方差分量估计定权方法.结果表明:多系统组合定位时,单历元可用卫星数增大,GDOP值明显减小,精度以及稳定性等定位性能得到有效提升.基于UERE的Helmert方差分量估计定权方法相较传统的先验定权和基于验后方差估计的定权方法,可明显改善多系统组合定位的精确度,且降低迭代计算次数.