Novatel OM-20000041 Manuel D’Utilisation
H
Some Common Unit Conversions
MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1
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H.6
GPS TIME OF WEEK TO CALENDAR DAY (EXAMPLE)
511200 seconds
Day
511200 / 86400 seconds per day
=
5.916666667 days
Hour
.916666667 x 86400 / 3600 seconds per hour
=
22.0000 hours
Minute
.000 x 3600 / 60 seconds per minute
=
0.000 minutes
Second
.000 x 60
=
0.00 seconds
Day 5 (Thursday) + 22 hours, 0 minutes, 0 seconds into Friday.
H.6.1 Calendar Date to GPS Time (e.g. 11:30 hours, January 22, 1995)
Days from January 6, 1980 to January 22, 1995
=
15 years x 365 days /year
=
5475 days
Add one day for each leap year (a year which is divisible by 4 or 400 but not by 100;
every 100 years a leap year is skipped)
4 days
Days into 1997 (22nd is not finished)
21 days
Total days
5500 days
Deduct 5 days: Jan. 1 through 5, 1980
5495 days
GPS Week:
5495 x 86400 seconds per day =
474768000 seconds/ 604800 sec per week = 785
Seconds into week
22nd day:
11.5 hrs x 3600 sec/hr
41400 seconds
GPS time of week:
Week 785, 41400 second