GPS Solutions

, Volume 11, Issue 1, pp 71–76 | Cite as

Finding the repeat times of the GPS constellation

  • Duncan Carr AgnewEmail author
  • Kristine M. Larson
GPS Tool Box


Single-epoch estimates of position using GPS are improved by removing multipath signals, which repeat when the GPS constellation does. We present two programs for finding this repeat time, one using the orbital period and the other the topocentric positions of the satellites. Both methods show that the repeat time is variable across the constellation, at the few-second level for most satellites, but with a few showing much different values. The repeat time for topocentric positions, which we term the aspect repeat time, averages 247 s less than a day, with fluctuations through the day that may be as much as 2.5 s at high latitudes.


Orbital Period Repeat Time Ground Track Multipath Signal Broadcast Ephemeris 
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.



We thank Penina Axelrad and George Rosborough for valuable discussions. This research was in part supported by the Southern California Earthquake Center, which is funded by NSF EAR-0106924 and USGS 02HQAG0008, and in part by NSF EAR-0337206. This is SCEC contribution 1012.


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Institute of Geophysics and Planetary Physics, Scripps Institution of OceanographyUniversity of California, San DiegoLa JollaUSA
  2. 2.Department of Aerospace Engineering SciencesUniversity of ColoradoBoulderUSA

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