一种多系统组合单点定位随机模型的确定方法
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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.
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.
引文
[1]杨元喜,曾安敏,景一帆.函数模型和随机模型双约束的GNSS数据融合及其性质[J].武汉大学学报(信息科学版),2014,39(2):127-131.
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[6]张帆.基于相对电离层延迟模型的单频GPS精密单点定位算法研究[J].测绘与空间地理信息,2016,39(5):122-124,128.
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[9]尚梦云,高晖,常青,等.GPS/GLONASS/BDS三系统组合定位的定权方法[J].太赫兹科学与电子信息学报,2014(3):375-379.
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[13]赵俊,郭建锋.方差分量估计的通用公式[J].武汉大学学报(信息科学版),2013,38(5):580-583.
[14]崔希璋.广义测量平差[M].武汉:武汉大学出版社,2005.
[15]张勤,张菊清,岳东杰.近代测量数据处理与应用[M].北京:测绘出版社,2011.
[2]张小红,郭斐,李星星,等.GPS/GLONASS组合精密单点定位研究[J].武汉大学学报(信息科学版),2010,35(1):9-12.
[3]张寅生,程洪玮,姚静,等.组合导航卫星系统定位技术进展[J].全球定位系统,2009(5):1-6.
[4]胡国荣,崔伟宏.组合GPS/GLONASS精密定位的观测值随机模型[J].遥感学报,2001,5(2):95-99.
[5]王晓波,钱枫,金丽华.“北斗二号”导航定位系统与GPS伪距单点定位性能对比研究[J].测绘与空间地理信息,2016,39(2):97-99,103.
[6]张帆.基于相对电离层延迟模型的单频GPS精密单点定位算法研究[J].测绘与空间地理信息,2016,39(5):122-124,128.
[7]蔡昌盛,戴吾蛟,匡翠林,等.单频GPS/GLONASS组合单点定位的精度评估[J].大地测量与地球动力学,2011(3):85-90.
[8]何俊,袁小玲,曾琪,等.GPS/BDS/GLONASS组合单点定位研究[J].测绘科学,2014(8):124-128.
[9]尚梦云,高晖,常青,等.GPS/GLONASS/BDS三系统组合定位的定权方法[J].太赫兹科学与电子信息学报,2014(3):375-379.
[10]余文坤.GPS/GLONASS组合定位技术及其在变形监测中的应用[D].长沙:中南大学,2013.
[11]BLANCO-DELGADO N,NUNES F D.Satellite selection based on WDOP concept and convex geometry[M].Esa Workshop on Satellite Navigation Technologies&European Workshop on Gnss Signals&Signal Processing,2010,1-8.
[12]PARKINSON B,SPILKER J.The Global Positioning System:Theory and Applications,ser.Progress in astronautics and aeronautics[M].Washington,DC:American Institute of Aeronautics and Astronautics,1996,vol.I.
[13]赵俊,郭建锋.方差分量估计的通用公式[J].武汉大学学报(信息科学版),2013,38(5):580-583.
[14]崔希璋.广义测量平差[M].武汉:武汉大学出版社,2005.
[15]张勤,张菊清,岳东杰.近代测量数据处理与应用[M].北京:测绘出版社,2011.