基于服务系统的实时精密单点定位技术及应用研究
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摘要
讨论了实时精密单点定位的若干关键技术,着重研究了实时精密钟差估计算法;利用全球40个IGS跟踪站连续、实时的观测数据流进行实时精密卫星钟差估计,解算出的实时精密钟差与CODE事后精密钟差具有较好的一致性,二者互差的RMS优于0.2 ns.采用实时估计的卫星钟差和IGS发布的超快速精密卫星轨道进行实时精密单点定位模拟实验,结果表明:经过大约15～30 min初始化后,实时精密单点定位滤波收敛之后水平方向的定位精度优于5 cm,高程方向的精度优于10 cm,能满足在该精度级别的实时用户的定位需求.处理汶川地震期间震区的GPS观测数据,结果表明实时精密单点定位能够探测地震发生期间的地面同震位移.
Some key technologies of real-time precise point positioning (PPP) are discussed in this paper,and the mathematic model and method applied to estimate precise clock correction in real time is introduced,the real-time observations obtained from GPS continuous operational reference stations are used to estimate the precise clock correction in real time.Comparison between the estimated precise clock correction and final precise clock correction published by CODE indicates that RMS of the difference between each other is better than 0.2 ns.The satellite clock correction estimated in real time and ultra-rapid precise ephemeris from IGS are used to simulate real-time PPP,the results show that the positioning accuracy of real-time PPP is better than 5 cm in horizontal after half an hour convergence,the accuracy in vertical is better than 10 cm,which can satisfy the requirement of real-time user at this accuracy level.GPS observations from Wenchuan earthquake are also processed with the proposed method,its results show that the surface coseismic displacement caused by the earthquake can be detected by real-time PPP method.
Some key technologies of real-time precise point positioning (PPP) are discussed in this paper,and the mathematic model and method applied to estimate precise clock correction in real time is introduced,the real-time observations obtained from GPS continuous operational reference stations are used to estimate the precise clock correction in real time.Comparison between the estimated precise clock correction and final precise clock correction published by CODE indicates that RMS of the difference between each other is better than 0.2 ns.The satellite clock correction estimated in real time and ultra-rapid precise ephemeris from IGS are used to simulate real-time PPP,the results show that the positioning accuracy of real-time PPP is better than 5 cm in horizontal after half an hour convergence,the accuracy in vertical is better than 10 cm,which can satisfy the requirement of real-time user at this accuracy level.GPS observations from Wenchuan earthquake are also processed with the proposed method,its results show that the surface coseismic displacement caused by the earthquake can be detected by real-time PPP method.
引文
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[5] About OmniSTAR Worldwide DGPS Service.http://www.omnistar.com/about.html
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[9] Shi C,Zhao Q L,Geng J H,et al.Recent development of PANDA software in GNSS data processing.International Conference on Earth Observation Data Processing and Analysis (ICEODPA).Wuhan,China:SPIE.2008
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[11] Chen K.Real-time precise point positioning and its potential applications.In:Proceedings of 17th Int Tech Meet Satellite Div Inst Navigation GNSS,21-24,September,2004． Long Beach,CA,USA
[12] Bisnath S,Gao Y.Current state of precise point positioning and future prospects and limitations.International Association of Geodesy Symposia,2008,133:615～623
[13] Geng J,Teferle F N,Meng X,et al.Kinematic precise point positioning at remote marine platforms.GPS Solut,2010,1521～1886 (Online),doi:10． 1007/s10291-009-0157-9
[14] Ray J,Griffiths J.Status of IGS ultra rapid products for realtime applications.AGU Fall Meeting Abstracts,2008
[15] Lou Y D,Shi C,Ge M R,et al.Determination of GPS realtime precise clock offset.International Conference on Earth Observation Data Processing and Analysis (ICEODPA).Wuhan,China:SPIE.2008(7285)
[16] 楼益栋.导航卫星实时精密定轨与钟差确定[博士论文].武汉:武汉大学测绘学院,2008 Lou Y D.Research on real time precise GPS orbit and clock offset determination[Ph.D.thesis](in Chinese).Wuhan:School of Geodesy and Geomatics,Wuhan University,2008
[2] Kouba J,Heroux P.Precise point positioning using IGS orbit and clock products.GPS Solut,2001,5(2) :12～28
[3] Dixon K.StarFire~(TM) a global SBAS for sub-decimeter precise point positioning.ION GNSS 19th International Technical Meeting of the Satellite Division.Fort Worth,Texas.2006． 2286～2296
[4] 冯林刚,赵永贵.星基差分GPS--Star Fire系统.测绘通报,2006,(11) :6～8 Feng L G,Zhao Y G.Star-based differential GPS system StarFire.Bulletin of Surveying and Mapping (in Chinese),2006,(11) :6～8
[5] About OmniSTAR Worldwide DGPS Service.http://www.omnistar.com/about.html
[6] W(u|¨)bbena G,Schmitz M,Bagge A.PPP-RTK:precise point positioning using state-space representation in RTK networks.18th International Technical Meeting,ION GNSS-05． 2005:Long Beach,California
[7] Kouba J.A guide to using International GNSS Service (IGS) products[online].2009:IGS Central Bureau May 2009 Avail at http://igscb.jpl.nasa.gov/igscb/resource/pubs/ UsingIGSProductsVer21． pdf.Accessed 11 June 2009
[8] Ge M R,Chen J,Gendt G.EPOS-RT:software for realtime GNSS data processing.General Assembly European Geosciences Union.Vienna,Austria,2009
[9] Shi C,Zhao Q L,Geng J H,et al.Recent development of PANDA software in GNSS data processing.International Conference on Earth Observation Data Processing and Analysis (ICEODPA).Wuhan,China:SPIE.2008
[10] Gao R,Meng X,Geng J,et al.Application of real time precise point positioning and GIS for rail track deformation monitoring of the Qinghai Tibet Railway.2008 Proceedings of the 11th International IEEE Conference on Intelligent Transportation Systems,Beijing,2008,ITSC.693～698
[11] Chen K.Real-time precise point positioning and its potential applications.In:Proceedings of 17th Int Tech Meet Satellite Div Inst Navigation GNSS,21-24,September,2004． Long Beach,CA,USA
[12] Bisnath S,Gao Y.Current state of precise point positioning and future prospects and limitations.International Association of Geodesy Symposia,2008,133:615～623
[13] Geng J,Teferle F N,Meng X,et al.Kinematic precise point positioning at remote marine platforms.GPS Solut,2010,1521～1886 (Online),doi:10． 1007/s10291-009-0157-9
[14] Ray J,Griffiths J.Status of IGS ultra rapid products for realtime applications.AGU Fall Meeting Abstracts,2008
[15] Lou Y D,Shi C,Ge M R,et al.Determination of GPS realtime precise clock offset.International Conference on Earth Observation Data Processing and Analysis (ICEODPA).Wuhan,China:SPIE.2008(7285)
[16] 楼益栋.导航卫星实时精密定轨与钟差确定[博士论文].武汉:武汉大学测绘学院,2008 Lou Y D.Research on real time precise GPS orbit and clock offset determination[Ph.D.thesis](in Chinese).Wuhan:School of Geodesy and Geomatics,Wuhan University,2008
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