The Contribution of GLONASS and Galileo to Kinematic GPS Precise Point Positioning

J.G.O. Gjevestad and O. Ovstedal, and N.S. Kjorsvik

Abstract:	Precise Point Positioning (PPP) involves observations from a single GNSS receiver only and is a precise and cost effective alternative to dierential methods. Dependent on satellite availability, time span of continuous observations and quality of observations, potential accuracies are at the centimeter level for static applications and sub-decimeter level for kinematic applications. In PPP carrier phase ambiguities are estimated along with other parameters in the adjustment process. The burden of the ambiguity parameters makes PPP somewhat more vulnerable to reduced satellite availability than dierential methods with fixed carrier phase ambiguities. In applications like marine surveys in waters with severe terrain obstructions at high latitudes one single GNSS system will experience poor positioning performance. A study is performed to assess PPP performance of the present GPS system in a steep Norwegian fjord surrounded by high mountains. The performances of full constellation GLONASS and future GALILEO systems as well as dual and triple system combinations are also assessed. Quality numbers are given in terms of availability, satellite geometry, precision and reliability measures based on rigorous statistics. The analysis is based on PPP processing of synthetic GNSS observations from a software simulator. For the simulated scenarios, no single GNSS system is available to provide coordinates for all epochs. Height reliability improve from typical meter level for single GNSS systems to a few decimeters for dual systems and further to decimeter level for the triple system combination.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	876 - 882
Cite this article:	Gjevestad, J.G.O., Ovstedal, O., Kjorsvik, N.S., "The Contribution of GLONASS and Galileo to Kinematic GPS Precise Point Positioning," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 876-882.
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