Point Real-Time Kinematic Positioning
Autonomous point positioning was the original aim of GPS. However, due to errors caused by satellite ephemerides, satellite clock corrections, ionosphere, troposphere, multipath and noise, the accuracy of autonomous point positioning cannot be better than a couple of meters, even after Selective Availability (SA) was turned off.
Nowadays, with the emergence of Point Real-Time Kinematic (P-RTK) positioning, a lot of attention is again focused on standalone positioning. This method arose from the availability of precise ephemeris and satellite clock corrections. The concept behind this method is to make use of un-differenced code and carrier phase observations along with precise corrections to get the best accuracy out of GPS. The concepts, challenges, processing steps and results of the P-RTK system are presented in this paper.
Currently at the University of Calgary, a software system has been developed that achieves centimeter to decimeter level accuracy with a single GPS receiver. All components of P-RTK have been incorporated in this software, which is portable and user-friendly, containing many graphical interface tools for analyzing data.
KeywordsGPS Precise Point Positioning RTK
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- Gao, Y. and X. Shen (2002). “A New Method Of Carrier Phase Based Precise Point Positioning”, Navigation: Journal of the Institute of Navigation, Vol. 49, No. 2.Google Scholar
- IGS, (2000). The IGS-2000 Annual Report.Google Scholar
- Kouba, J and P. Heroux (2000). “GPS Precise Point Positioning Using IGS Orbit Products”, GPS Solutions, Vol.5, No.2, Fall.Google Scholar
- Michael J. Gabor (2000) “Characteristics Of Satellite-Satellite Single Difference Widelane Fractional Carrier Phase Biases”. Proceedings of ION GPS 2000, Salt Lake City, UT, 19–22 September.Google Scholar
- Teunissen, P.J.G. and A. Kleusberg (Eds.) (1998). GPS for Geodesy. Second Edition, Springer-Verlag, New York.Google Scholar
- Zumberge James. F., M. M. Watkins and F. H. Webb (1997). “Characteristics And Applications Of Precise GPS Clock Solutions Every 30 Seconds”. Navigation, Journal of the Institute of Navigation. 44(4), 449–456 winters 1997–1998.Google Scholar
- GPS*C ICD, 2001, Natural Resources Canada. URL: www.cdgps.com/e-test/cdgps_documents/%5B14%5D%20-%20ICD%20-0/o20GPSC%20-%202001-02-06.pdfGoogle Scholar