Integrated use of GPS and EGNOS Carrier Phase Observations for High Precision Kinematic Positioning

K. Sauer and W.Y. Ochieng

Abstract:	Real-time satellite positioning at the sub-decimeter or even sub-centimeter level of accuracy requires the use of carrier phase data. However, in harsh operational environments such as those encountered in engineering environments, often the number and geometry of available satellites are insufficient, due to signal blockage. Combined use of GPS dual frequency and EGNOS single frequency carrier phase data should provide a degree of increased reliability and availability of positioning with carrier phase. To exploit this to a full extent, the different error sources should be reduced significantly. This paper assesses the possibility of creating a local ionospheric model for the EGNOS single frequency data, using GPS dual frequency measurements, a Kalman filter and a weighted 2-D biharmonic spline interpolation algorithm. The results show that the local ionospheric model can facilitate significantly, the correct determination of integer ambiguities particularly in those cases where some GPS satellites are unavailable due to blockage.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	914 - 920
Cite this article:	Sauer, K., Ochieng, W.Y., "Integrated use of GPS and EGNOS Carrier Phase Observations for High Precision Kinematic Positioning," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 914-920.
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