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Correction of troposhere induced errors in global positioning systems

  • US 20070027624A1
  • Filed: 04/19/2004
  • Published: 02/01/2007
  • Est. Priority Date: 04/17/2003
  • Status: Active Grant
First Claim
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1. A method of obtaining tropospheric delay data for use in a satellite positioning system or GNSS by a user location comprising the steps of generating at a location remote from the user location, and from meteorological information, at least one accurate tropospheric delay value, applicable to the user location and either, with knowledge of the user position, generating said at least one accurate tropospheric delay value for the known user location for communication as a correct tropospheric dealy value to said user, or without knowledge of the user location, generating at least one tropospheric delay value presumed by a user to be applicable at a said unknown location then determining from the accurate and presumed tropospheric delay values a correction applicable to the presumed tropospheric delay values for communication as a tropospheric delay correction to a said user.

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