| 3种GPS+BDS组合PPP模型比较与分析 |
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| 引用本文： | 臧楠,李博峰,沈云中.3种GPS+BDS组合PPP模型比较与分析[J].测绘学报,2017,46(12):1929-1938. |
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| 作者姓名： | 臧楠 李博峰 沈云中 |
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| 作者单位： | 1. 同济大学测绘与地理信息学院, 上海 200092;2. 大地测量与地球动力学国家重点实验室, 湖北 武汉 430077 |
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| 基金项目： | 国家自然科学基金，大地测量与地球动力学国家重点实验室开放研究基金，The National Natural Science Foundation of China，The Open Fund of the State Key Laboratory of Geodesy and Earth's Dynamics |
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| 摘 要： | 无电离层组合和非组合模型是GNSS精密单点定位(PPP)常用的两种函数模型。本文通过详细分析PPP的两种函数模型各类参数间的相关特性,建立了参数独立的函数模型。对非组合PPP模型的电离层参数引入虚拟观测方程进行约束,有效提高了PPP的收敛速度。最后,从定位精度和收敛时间两方面分析不同函数模型的GPS单系统和GPS+BDS组合PPP静态、模拟动态定位效果。结果表明:GPS单系统和GPS+BDS组合PPP定位精度相当,静态的无电离层组合与非组合PPP均可达到厘米至毫米级精度,动态PPP精度的平面优于3cm,高程优于5cm;无电离层组合PPP收敛时间优于非组合的PPP,电离层加权非组合PPP的收敛时间最短。动态定位中,电离层加权模型相比于无电离层组合模型,可减少约15%的收敛时间,相比于非组合模型,可减少约34%。
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| 关 键 词： | 精密单点定位 函数模型 参数化 电离层先验约束 GPS+BDS |
| 收稿时间： | 2017-03-09 |
| 修稿时间： | 2017-07-03 |
Comparison and Analysis of Three GPS+BDS PPP Models |
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| ZANG Nan,LI Bofeng,SHEN Yunzhong.Comparison and Analysis of Three GPS+BDS PPP Models[J].Acta Geodaetica et Cartographica Sinica,2017,46(12):1929-1938. |
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| Authors: | ZANG Nan LI Bofeng SHEN Yunzhong |
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| Institution: | 1. College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China;2. State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China |
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| Abstract: | In general,ionosphere-free model and uncombined model are applied for GNSS precise point positioning (PPP).This paper detailed analyzes the correlation of different parameters of each model,and deducevarious PPP functional model by means of parameterization methods.And uncombined PPP with ionospheric parameter constrains i.e.ionosphere-weighted model can fasten PPP convergence effectively.This paper takes advantage of GPS-only and GPS and BDS combination dataset as example for positioning in different PPP models.In the perspective of positioning accuracy and convergence time,positioning performance are detailed analyzed in both static PPP and simulated dynamic PPP modes.The results demonstrate that GPS-only has the similar accuracy with GPS-+BDS combination,and both ionosphere-free model and uncombined model static PPP can achieve the positioning accuracy of millimeter to centimeter level,while the horizontal positioning accuracy of dynamic PPP is superior to 3 cm and the vertical positioning accuracy is superior to 5 cm.ln terms of convergence time,ionosphere-free model is superior to uncombined model,and the convergence time of ionosphere-weighted model is the shortest.Compared to the ionosphere-free model,the ionosphere-weighted model can decrease about 15％ convergence time,while it can decrease about 34％ convergence time compared to the uncombined model in the dynamic positioning. |
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| Keywords: | PPP functional model parameterization prior ionospheric constrains GPS+BDS |
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