[time-nuts] GPS week rollover
Tom Van Baak
tvb at LeapSecond.com
Wed May 6 14:50:54 UTC 2015
> Whats useful is the method for calculating the week mentioned. Granted
> there are tools online that help. But the math associated with reversing
> the date now is clearer using the Julian date. May tinker in excel as I
> think there are date macros and such available.
> The output needed for the old receivers is now - 1024 weeks given as a date.
> On some of the really old ones I think it may be 2 rollovers at this point.
>
> Regards
> Paul
> WB8TSL
Paul, there's lots of JD/MJD and GPS date time code at www.leapsecond.com/tools/
Look for gpsweek.c gpsdate.c gpsepoch.c mjd.c mjdclock.c to name a few.
To plan ahead for the next century try this:
C:\tvb\cl> gpsweek 1980 2100 | grep rollover
1023 0 1023 1999-08-15 227 228 229 230 231 232 233 rollover
2047 1 1023 2019-03-31 90 91 92 93 94 95 96 rollover
3071 2 1023 2038-11-14 318 319 320 321 322 323 324 rollover
4095 3 1023 2058-06-30 181 182 183 184 185 186 187 rollover
5119 4 1023 2078-02-13 44 45 46 47 48 49 50 rollover
6143 5 1023 2097-09-29 272 273 274 275 276 277 278 rollover
/tvb
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