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GPS Solutions

, Volume 5, Issue 2, pp 71–77 | Cite as

Time-Relative Positioning with a Single Civil GPS Receiver

  • Stephanie Michaud
  • Rock Santerre
FEATURE ARTICLES

Time-relative positioning is a recent method for processing GPS phase observations. The operational method undertaken in this paper consists of the following steps: first, recording phase observations at a station of known coordinates; second, moving the GPS receiver to an unknown station (which can be located up to a few hundred meters away, dependint on what type of transportation – e. g., walking, motorcycle – is available) while continuously observing carrier phases; and, third, recording phase observations at a second station of unknown coordinates with a single GPS receiver. To obtain the position of the unknown station relative to the first (known) station, the processing method uses combined observations taken at two different epochs and two different stations with the same receiver. For this reason, the errors that vary between two epochs must be taken into account in an appropriate way, especially errors in satellite clock corrections and ephemerides, and errors related to tropospheric and ionospheric delays. Ionospheric modeling using IONEX files (the ionospheric maps calculated by the International GPS Service) was also tested to correct L1 phase observations. This method has been used to calculate short vectors with an accuracy of a few centimeters (for a processing interval of 30 s) using a single civil GPS receiver. © 2001 John Wiley & Sons, Inc.

Keywords

Unknown Station Ionospheric Delay Satellite Clock Phase Observation Ionospheric Modeling 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© John Wiley & Sons, Inc. 2001

Authors and Affiliations

  • Stephanie Michaud
    • 1
  • Rock Santerre
    • 1
  1. 1.Centre for Research in Geomatics, Laval University, Quebec City, Canada G1K 7P4CA

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