Application of Independently Estimated DCB and Ionospheric TEC in Single-Frequency PPP

Precise Point Positioning technology is one of the most interesting research topics within the GNSS positioning and navigation community in the last decade for a number of reasons: simplified operation, cost-effectiveness and no base stations required. With the availability of dual-frequency receivers and precise GPS products, PPP has demonstrated capable of providing centimeter to decimeter level point positioning accuracy globally. As for single-frequency PPP, the accuracy deceases, particularly in the height component. One dominant factor for this degradation is the effect of unmodeled ionospheric delay. This paper investigates PPP technique using single-frequency data as single-frequency receivers are the most widely used tools for tracking, navigation and geo-referencing. Since the unmodeled ionospheric error is the biggest error source for a single-frequency receiver based on PPP system, an ionospheric error mitigation method named POLY model based on GPS regional reference station network is introduced for the reason that it can provide independent DCB and ionospheric TEC. In addition, three other different methods, as the Klobuchar model, the GIM model and the GRAPHIC algorithm, are assessed and their accuracy compared. Numerical results show that the POLY method offers better performance than GIM method, which is able to provide approximately 0.5 m point accuracy for static positioning over 24 h observation period.

[1]  Yang Gao,et al.  Real-Time Precise Point Positioning Using Single Frequency Data , 2005 .

[2]  P. A. Cross,et al.  Lecture notes in Earth sciences: Vol. 12. S. Turner (Editor), Applied Geodesy VIII, Springer, Berlin, F.R.G., 1987, 393pp, DM78.00, ISBN 3 540 182195 , 1989 .

[3]  Zhizhao Liu,et al.  Ionosphere modelling using carrier smoothed ionosphere observations from a regional gps network , 2002 .

[4]  J. Klobuchar.  Ionospheric Time-Delay Algorithm for Single-Frequency GPS Users , 1987, IEEE Transactions on Aerospace and Electronic Systems.

[5]  O. Ovstedal,et al.  Absolute Positioning with Single-Frequency GPS Receivers , 2002 .

[6]  Brian Wilson,et al.  Extracting Ionospheric Measurements from GPS in the Presence of Anti-Spoofing , 1994 .

[7]  S. Schaer.  Mapping and predicting the Earth's ionosphere using the Global Positioning System. , 1999 .

[8]  Yunbin Yuan,et al.  A generalized trigonometric series function model for determining ionospheric delay , 2004 .

[9]  Thomas P. Yunck,et al.  Coping with the Atmosphere and Ionosphere in Precise Satellite and Ground Positioning , 2013 .

[10]  Pierre Héroux,et al.  Precise Point Positioning Using IGS Orbit and Clock Products , 2001, GPS Solutions.

[11]  Michael B. Heflin,et al.  Examining the C1-P1 Pseudorange Bias , 2001, GPS Solutions.

[12]  Oliver Montenbruck,et al.  Kinematic GPS positioning of LEO satellites using ionosphere-free single frequency measurements , 2003 .

[13]  James R. Clynch,et al.  Variability of GPS satellite differential group delay biases , 1991 .

[14]  Peter Teunissen,et al.  GPS for geodesy , 1996 .

[15]  Attila Komjathy,et al.  Global ionospheric total electron content mapping using the global positioning system , 1997 .

[16]  J. Kouba.  A GUIDE TO USING INTERNATIONAL GNSS SERVICE (IGS) PRODUCTS , 2003 .

[17]  Yuan Yunbin,et al.  Models and methods for precise determination of Ionospheric delay using GPS , 2007 .

[18]  Kefei Zhang,et al.  An Evaluation of Various Ionospheric Error Mitigation Methods used in Single Frequency PPP , 2008 .

[19]  J. Zumberge,et al.  Precise point positioning for the efficient and robust analysis of GPS data from large networks , 1997 .