Hi Matthias:
Trimble thought they had come up with a way to account for GPS week rollover,
but the Earth has not cooperated. See:
Leap-second cure for 1999 GPS rollover problem
https://www.google.com/patents/US5923618
Do you know anything about the Northern Telecom GPS Satellite Simulator STR2760?
http://www.prc68.com/I/NTgpsSTR2760.shtml
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Matthias Jelen wrote:
Hello,
I got a Trimble Thunderbolt a few months ago and implemented a simple monitor on a MCU to display time, no of
satellites etc. on a lcd display.
While working on this, I found the hint for the upcoming rollover in 2017 in the user manual. I couldn?t find any
details on this in the internet - the question for me was if the unit becomes useless in about three years (which
would minimize my motivation to put all the stuff in a shiny enclosure) or if simply the calculation of the date will
fail.
So I took the unit to work and hooked it to a signal generator capable of simulating GPS, GNSS etc. systems. As
expected, everything works fine until July, 2017. If I try dates later than this, Lady Heather refuses to display time
and date. The strange thing is that time and date are still sent in the serial protocol. August 20th, 2018 is decoded
as January, 4t, 1999. As expected, time is OK.
So, hopefully this is only a problem in LH and the Thunderbolt will be usable after July, 2017 - I?d be happy to live
with a wrong date.
Can anyone confirm this observations or does anyone have more information on
this topic?
Thanks a lot and regards,
Matthias, DK4YJ
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