Enhancing the Accuracy of Global Navigation Satellite Systems
DOI:
https://doi.org/10.54489/ijcim.v4i2.393Keywords:
DGPS, RTK, Klobucher model, Hopfield, Saastimoinen and IGSAbstract
Fast and precise relative positioning for baselines can be achieved using dual-frequency Global Positioning System (GPS) receivers. While the Differential GPS (DGPS) technique enhances GNSS accuracy by mitigating certain errors, it cannot entirely eliminate orbital, ionospheric, and tropospheric errors. This study explores the application of accurate relative positioning for processing GPS data, discussing its advantages and limitations, and compares the outcomes with relative positioning results obtained using the Mecca permanent GPS observation network. The results and analysis of the integrated system are presented. The findings conclude that utilizing precise ephemeris from the International GPS Services (IGS) Network in combination with the Klobuchar ionospheric model and either the Hopfield or Saastamoinen tropospheric model significantly improves the accuracy of DGPS measurements.
References
Alves P. (2004) Development of two novel carrier phase-based methods for multiple Reference station positioning, PhD, The University of Calgary, Canada.
Hofmann et al (1997), "GPS:Theory and Practice". 4th revised ed., Springer Wien New York 389p..
Kouba, J.(2003) "A Guide to using international GPS Services (IGS) Products".GSD,Ottawa, Ontario Canada, February.
Kouba, J. and Heroux, P.(2000), "GPS Precise Point Positioning) using IGS Orbit Products", GSD,NRCan.
Roulston, A. Talbot N.and Zhang K.(2000), " An Evaluation of Various GPS Satellite Ephemeris, "Proceedings of ION GPS 2000,Salt Lake City, UT.
Salam, M.A.Gao , Y. and Shen , X. (2002), "Analyzing the Performance Characteristics of a Precise Point Positioning System", Proceedings of ION GPS,Portland
Shen ,X.(2002), "Improving ambiguity Convergence in Carrier Phase-based Precise Point Positioning" MSc. Theses, Department of Geometrics Engineering, University of Calgary.
Witchayangkoon, B.(2002), "Elements of GPS Precise Point Positioning", M.Sc.Thesis, the University of Maine December
Zhong-yi,C,Cheng. H; Xiao-Gong,H.(2002), "Solution of Regional GPS Network Using Precise Point Positioning with Undifferenced Data", Chinese Astronomy and Astrophysics 26,p 69-80.
