An improved regularization method for estimating near real-time systematic errors suitable for medium-long GPS baseline solutions

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	An improved regularization method for estimating near real-time systematic errors suitable for medium-long GPS baseline solutions
	Luo, Xiaowen ; Ou, Jikun ; Yuan, Yunbin ; Gao, Jinyoa ; Jin, Xianglong ; Zhang, Kefei ; Xu, Huajun
刊名	Earth Planets and Space
	2008
期号	8 页码:793-800
中文摘要	It is well known that the key problem associated with network-based real-time kinematic (RTK) positioning is the estimation of systematic errors of GPS observations, such as residual ionospheric delays, tropospheric delays, and orbit errors, particularly for medium-long baselines. Existing methods dealing with these systematic errors are either not applicable for making estimations in real-time or require additional observations in the computation. In both cases, the result is a difficulty in performing rapid positioning. We have developed a new strategy for estimating the systematic errors for near real-time applications. In this approach, only two epochs of observations are used each time to estimate the parameters. In order to overcome severe ill-conditioned problems of the normal equation, the Tikhonov regularization method is used. We suggest that the regularized matrix be constructed by combining the a priori information of the known coordinates of the reference stations, followed by the determination of the corresponding regularized parameter. A series of systematic errors estimation can be obtained using a session of GPS observations, and the new process can assist in resolving the integer ambiguities of medium-long baselines and in constructing the virtual observations for the virtual reference station. A number of tests using three medium- to long-range baselines (from tens of kilometers to longer than 1000 kilometers) are used to validate the new approach. Test results indicate that the coordinates of three baseline lengths derived are in the order of several centimeters after the systematical errors are successfully removed. Our results demonstrate that the proposed method can effectively estimate systematic errors in the near real-time for medium-long GPS baseline solutions.
原文出处	://WOS:000259390700001
公开日期	2012-04-11
内容类型	期刊论文
源URL	[http://ir.whigg.ac.cn/handle/342008/3195]
专题	测量与地球物理研究所_其他_期刊论文
推荐引用方式 GB/T 7714	Luo, Xiaowen,Ou, Jikun,Yuan, Yunbin,et al. An improved regularization method for estimating near real-time systematic errors suitable for medium-long GPS baseline solutions[J]. Earth Planets and Space,2008(8):793-800.
APA	Luo, Xiaowen.,Ou, Jikun.,Yuan, Yunbin.,Gao, Jinyoa.,Jin, Xianglong.,...&Xu, Huajun.(2008).An improved regularization method for estimating near real-time systematic errors suitable for medium-long GPS baseline solutions.Earth Planets and Space(8),793-800.
MLA	Luo, Xiaowen,et al."An improved regularization method for estimating near real-time systematic errors suitable for medium-long GPS baseline solutions".Earth Planets and Space .8(2008):793-800.