Hi again Mark, > Most GPS receivers base their rollover point from their data of > manufacture/firmware creation/etc. The week rolls over 1024 weeks after > that. They tend to not be dependent upon when the actual GPS week rolls > over. Better receivers have ways of inferring the actual week after a > rollover occurs... it appears that the Thunderbolt does not do this. > Also, most GPS receivers do not cease to work after a rollover... they > just report a bad date. > > From the Thunderbolt manual: > The first week number roll-over will occur as August 21, 1999 (GPS) > transitions to August 22, 1999 (GPS). The ThunderBolt adjusts for this > week rollover by adding 1024 to any week number reported by GPS which is > less that week number 936 which began on December 14, 1997. With this > technique, the ThunderBolt will provide an accurate translation of GPS > week number and TOW to time and date until July 30, 2017.
A neat solution to this would be if the time-nuts could reverse engineer enough of the Tbolt to mod the firmware and fix any upcoming roll-over issues. Anyone know if Trimble has issued any firmware upgrades to the general public? Both my Nortel GPSTM 45000-boards have later firmwares inside than in the printing on the physical board. -- Björn _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
