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C.6.1 CALENDAR DATE TO GPS TIME
Example:
Days from January 6, 1980 to January 28, 2005 = 6 years x 365 days /year =
Add one day for each leap year (a year is a leap year if it is divisible by 4
but not by 100, except for years that are divisible by 400)
Days into 2005 (28th is not finished)
Total days
Deduct 5 days: (Jan. 1 - 5, 1980)
GPS Week: 9154 x 86400 seconds per day = 790905600 seconds/ 604800 sec per week
Every 1023 weeks the week rolls over to 0
Seconds into week
6th day:
GPS time of week:
C.7 ANGULAR CONVERSIONS
z
p = pi
3.1415927...
radians = degrees
degrees = radians
Magnetic bearing = True bearing + Magnetic variation
True bearing = Magnetic bearing - Magnetic variation
1
NOTE:
A variation west is negative while a variation east is positive, see Pages 86 and 103 for illustrations.
GPS/GLONASS Receiver User Manual Rev 1
13.5 hrs x 3600 sec/hr 48600 seconds
Week 283, 48600 second
×
(
180 π ⁄
)
×
(
π 180
⁄
)
C Common Unit Conversions
1
1
9125 days
7 days
27 days
9159 days
9154 days
283 weeks
55
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