Satellite- and Epoch Differenced Precise Point Positioning Based on a Regional Augmentation Network

	Satellite- and Epoch Differenced Precise Point Positioning Based on a Regional Augmentation Network
	Li, Haojun 1; Chen, Junping1 ; Wang, Jiexian 2; Wu, Bin1
刊名	SENSORS
	2012-06-01
卷号	12 期号:6 页码:7518-7528
关键词	SDED differential precise point positioning regional augmentation correction information
英文摘要	Precise Point Positioning (PPP) has been demonstrated as a simple and effective approach for user positioning. The key issue in PPP is how to shorten convergence time and improve positioning efficiency. Recent researches mainly focus on the ambiguity resolution by correcting residual phase errors at a single station. The success of this approach (referred to hereafter as NORM-PPP) is subject to how rapidly one can fix wide-lane and narrow-lane ambiguities to achieve the first ambiguity-fixed solution. The convergence time of NORM-PPP is receiver type dependent, and normally takes 15-20 min. Different from the general algorithm and theory by which the float ambiguities are estimated and the integer ambiguities are fixed, we concentrate on a differential PPP approach: the satellite-and epoch differenced (SDED) approach. In general, the SDED approach eliminates receiver clocks and ambiguity parameters and thus avoids the complicated residual phase modeling procedure. As a further development of the SDED approach, we use a regional augmentation network to derive tropospheric delay and remaining un-modeled errors at user sites. By adding these corrections and applying the Robust estimation, the weak mathematic properties due to the ED operation is much improved. Implementing this new approach, we need only two epochs of data to achieve PPP positioning converging to centimeter-positioning accuracy. Using seven days of GPS data at six CORS stations in Shanghai, we demonstrate the success rate, defined as the case when three directions converging to desired positioning accuracy of 10 cm, reaches 100% when the interval between the two epochs is longer than 15 min. Comparing the results of 15 min' interval to that of 10 min', it is observed that the position RMS improves from 2.47, 3.95, 5.78 cm to 2.21, 3.93, 4.90 cm in the North, East and Up directions, respectively. Combining the SDED coordinates at the starting point and the ED relative coordinates thereafter, we demonstrate the performance of RTK PPP with standard deviation of 0.80, 1.34, 0.97 cm in the North, East and Up directions.
WOS标题词	Science & Technology ; Physical Sciences ; Technology
类目[WOS]	Chemistry, Analytical ; Electrochemistry ; Instruments & Instrumentation
研究领域[WOS]	Chemistry ; Electrochemistry ; Instruments & Instrumentation
关键词[WOS]	GPS ; RESOLUTION ; EFFICIENT ; PPP
收录类别	SCI
语种	英语
WOS记录号	WOS:000305801400038
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18100]
专题	上海天文台_天文地球动力学研究中心
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Tongji Univ, Dept Surveying & Geoinformat Engn, Shanghai 200092, Peoples R China
推荐引用方式 GB/T 7714	Li, Haojun,Chen, Junping,Wang, Jiexian,et al. Satellite- and Epoch Differenced Precise Point Positioning Based on a Regional Augmentation Network[J]. SENSORS,2012,12(6):7518-7528.
APA	Li, Haojun,Chen, Junping,Wang, Jiexian,&Wu, Bin.(2012).Satellite- and Epoch Differenced Precise Point Positioning Based on a Regional Augmentation Network.SENSORS,12(6),7518-7528.
MLA	Li, Haojun,et al."Satellite- and Epoch Differenced Precise Point Positioning Based on a Regional Augmentation Network".SENSORS 12.6(2012):7518-7528.