Figure 123: Gps. Tai And Utc Time - Applanix POS MV V5 Installation And Operation Manual

POS MV V5 Installation and Operation Guide
POS-GPS
Timing
Notes:
1. GPS and TAI are ahead of UTC time, see Figure 123.
2. Consult the International Earth Rotation Service (IERS) web pages for more quantitative
information.
GNSS Timing Basics
One Pulse Per Second
The basis for all time and frequency functions is the One Pulse Per Second (1PPS) signal supplied by the
GNSS receiver. This signal is typically a short logic pulse, one edge of which is adjusted by the receiver
to be 'on time' with respect to the one second epoch of UTC. In order to do this, the GNSS receiver needs
to know its position.
H-2
GPS to UTC
Date
Offset (sec)
Jan 1, 1988 5
Jan 1, 1990 6
Jan 1, 1991 7
Jul 1, 1992 8
Jul 1, 1993 9
Jul 1, 1994 10
Jan 1, 1996 11
Jul 1, 1997 12
Jan 1, 1999 13
Jan 1, 2006 14
Jan 1, 2009 15
Jul 1, 2012 16
Jul 1, 2015 17
Dec 30, 2016 18
UTC GPS
17 Leap
Seconds
17 Leap
Seconds

Figure 123: GPS. TAI and UTC Time

TAI to UTC
Date
Offset (sec)
Jan 1, 1988 24
Jan 1, 1990 25
Jan 1, 1991 26
Jul 1, 1992 27
Jul 1, 1993 28
Jul 1, 1994 29
Jan 1, 1996 30
Jul 1, 1997 31
Jan 1, 1999 32
Jan 1, 2006 33
Jan 1, 2009 34
Jul 1, 2012 35
Jul 1, 2015 36
Dec 30, 2016 37
TAI
t
19 Seconds
Fixed
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