一种多系统组合单点定位随机模型的确定方法  

A method of determining the stochastic model of Multi-GNSS single point positioning

作　　者：李文凯[1] 高俊强[1] 栗广才 Li Wenkai Gao Junqiang Li Guangcai(College of Geomatics Engineering, Nanjing Tech University, Nanjing 210000, China School of Geospatial Information, Information Engineering University, Zhengzhou 450052, China)

机构地区：[1]南京工业大学测绘科学与技术学院,江苏南京210000 [2]信息工程大学地理空间信息学院,河南郑州450052

出　　处：《测绘工程》2017年第7期60-65,共6页Engineering of Surveying and Mapping

摘　　要：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。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.

关 键 词：Multi-GNSS 组合定位 随机模型 UERE先验定权 HELMERT方差分量估计 

分 类 号：P228[天文地球—大地测量学与测量工程]