GPS Antenna
Synchronization Source Timing Accuracy to Reference Comments
GPS, 1 Satellite, position
known within 50m
<5 uS to UTC(USNO) Position from satellite fix
or entered by the user.
GPS, 1 Satellite, position
known within 1 km
<100 uS to UTC(USNO) Position from satellite fix
or entered by the user.
GPS, 1 Satellite, position
known within 10,000 km
<1 mS to UTC(USNO) User must provide a
guess at the position
within 10,000 km
IRIG AM
A13x
B12x
E11x
E12x
G14x
NASA 36 AM
XR3 AM
2137 AM
IRIG DCLS
A00x
B00x
E00x
G00x
NASA 36
XR3
2137
±5 uS relative to 1PPS output
±10 uS relative to 1PPS output
±100 uS relative to 1PPS output
±10 uS relative to 1PPS output
±5 uS relative to 1PPS output
±10 uS relative to 1PPS output
±10 uS relative to 1PPS output
±10 uS relative to 1PPS output
±500 nS relative to 1PPS output
±500 nS relative to 1PPS output
±500 nS relative to 1PPS output
±500 nS relative to 1PPS output
±500 nS relative to 1PPS output
±500 nS relative to 1PPS output
±500 nS relative to 1PPS output
10kHz
1kHz
100Hz
1kHz
100kHz
1kHz
250Hz
1kHz
1PPS ±100 nS
Ext. 10MHz Coherent with 1PPS
ACTS Modem
1
±100 mS < ±50 mS typical
LFR ±50 mS < ±20 mS typical
NTP Client Mode, Local
server
±10 mS Local server means on
same subnet
The stability of the various outputs depends on the oscillator installed. Shown below is the
Allan Deviation Stability of the system when synchronized to GPS.
1x10-12 at 1 day All oscillators
3x10-12 at 100 sec Rb Only
GPS Antenna
Frequency:1575 +/- 2 MHz
1
Accuracy with default polling intervals. Can be degraded with longer polling interval.
997-01520-02 Rev. F1.......................................................................... Page 125
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