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《Chinese Journal of Geophysics》 2012-07
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Rapid integer ambiguity-fixing in precise point positioning

ZHANG Bao-Cheng1,2,TEUNISSEN J G Peter3,4,ODIJK Dennis3, OU Ji-Kun1,JIANG Zhen-Wei1,2 1 Key Laboratory of Dynamic Geodesy,Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan 430077,China 2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China 3 GNSS Research Centre,Department of Spatial Sciences,Curtin University,Perth 6845,Australia 4 Delft Institute of Earth Observation and Space Systems,Delft University of Technology,2600 GB Delft,The Netherlands  
In this contribution,a method of isolating ionospheric delays,Satellite Phase Biases(SPBs) from a regional GPS network is presented to enable Precise Point Positioning(PPP) with rapid integer ambiguity-fixing.Experimental results based upon a reference station network whose inter-station distances range from 100~200 km demonstrate that the interpolation and extrapolation errors of the ionospheric delays are less than 1 dm,and the intra-day variation of the SPBs is no more than 0.2 cycles.Besides,starting from arbitrary epochs within the test day,the durations required for integer ambiguities fixing in PPP are at most 10 min,and after successful ambiguity-fixing,the obtainable accuracy of the 3-dimension positions can reach 80% improvements in contrast to their ambiguity-float counterparts.The proposed method is likely to overcome the long convergence behavior that is commonly experienced during PPP implementations and therefore promotes the practicability of the PPP.
【Fund】: 国家自然科学基金(41174015 41074013 41174031 41104012);; 中国科学院计算地球动力学重点实验室开放基金课题(007);; 中国卫星导航学术年会青年优秀论文获得者资助课题;; 国家海洋局第二海洋研究所基本科研业务经费(JT1003)联合资助
【CateGory Index】: P228.4
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