Novatel OM-20000053 Rev 2 Manual Do Utilizador
H
Some Common Unit Conversions
MiLLennium GPSCard SW Version 4.503/4.52 Command Descriptions Manual Rev 2
243
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. 13:30 hours, January 28, 2005)
Days from January 6, 1980 to January 28, 2005
=
6 years x 365 days /year
=
9125 days
Add one day for each leap year (a year which is divisible by 4 but not by 100 unless it is divisible by 400;
every 100 years a leap year is skipped)
7 days
Days into 2005 (28th is not finished)
27 days
Total days
9159 days
Deduct 5 days: Jan. 1 through 5, 1980
9154 days
GPS Week:
9154 x 86400 seconds per day =
790905600 seconds/ 604800 sec per week = 785
Seconds into week
6th day:
13.5 hrs x 3600 sec/hr
48600 seconds
GPS time of week:
Week 1307, 48600 second