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Journal of Geodetic Science

Editor-in-Chief: Eshagh, Mehdi

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Incorporation of the GPS satellite ephemeris covariance matrix into the precise point positioning

Masoud Shirazian
  • Corresponding author
  • Division of Geodesy and Geoinformatics, Royal institute of Technology, 100 44 Stockholm, Sweden
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Published Online: 2013-10-15 | DOI: https://doi.org/10.2478/jogs-2013-0022


In GPS positioning, usually the satellite ephemeris are fixed in the observation equations using broadcast or published values. Therefore, to have a realistic covariance matrix for the observations one must incorporate a well-defined covariance matrix of the satellite ephemeris into the observations covariance matrix. Contributions so far have discussed only the variance and covariance of the observations. Precise Point Positioning (PPP) is a technique aimed at processing of measurements from a single (stand-alone) GPS receiver to compute high-accurate position. In this paper, the covariance matrix of the satellite ephemeris and its impact on the position estimates through the PPP are discussed.

Keywords: covariance matrix; PPP; satellite ephemeris

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About the article

Published Online: 2013-10-15

Published in Print: 2013-09-01

Citation Information: Journal of Geodetic Science, Volume 3, Issue 3, Pages 143–150, ISSN (Online) 2081-9943, ISSN (Print) 2081-9919, DOI: https://doi.org/10.2478/jogs-2013-0022.

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