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《Science of Surveying and Mapping》 2014-08
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Study on GPS/BDS/GLONASS combined single point positioning

HE Jun;YUAN Xiao-ling;ZENG Qi;LIU Wan-ke;School of Geodesy and Geomatics,Wuhan University;  
The combined single point positioning of GPS,BDS and GLONASS was realized in the paper.On this basis,the global visibility and PDOP value of each system and their combination were analyzed.As to the inaccuracy of stochastic model in combined positioning,a comparison of equal weight model,elevation based model and Helmert variance component estimation model was carried out then.Experimental results showed that:1the average number of visible satellite was 10 for GPS and 7.7for GLONASS,which would not change much,but for BDS,this could be not the case,its satellite number changed greatly,when in 45°E~170°E,a total of more than 4BDS satellites could be seen;2once three systems combined,available satellites in single epoch increased by 2~3times,resulting in a sharp decrease in PDOP value;3elevation based model could express weight between observations of different systems well,Helmert variance component estimation showed that the weight ratio between GPS,BDS and GLONASS was about 1:0.8:0.8.
【Fund】: 国家自然科学基金资助(41204030);; 中电集团54所新技术研究高校合作项目(KX132600031)
【CateGory Index】: P228.4
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