NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: GPS as a time authority
From: Antoine Cou�tte
Date: 2009 Sep 15, 08:42 -0700
From: Antoine Cou�tte
Date: 2009 Sep 15, 08:42 -0700
I think that the reason brought up by "M. Lunav" is quite valid : processing times may vary according to types of GPS receivers. There is also an ESSENTIAL REASON, which may have been skipped in this thread. GPS cannot accomodate any time discontinuities. Therefore, some 15 years ago, GPS time - i.e. the one used by the GPS System - was the same as UT1. Now with the extra seconds added now and then to take in account the Earth rotation changes, GPS time itself which is much more stable than UT1 has become different from UT1 by a number of seconds amounting to 8 seconds (this amount to be confirmed) to-day. Antoine M. Cou?tte --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
