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3. Configuration
3.1 Configuration of GPS Receiver Unit
Figure 3.1.1 shows the configuration of the GPS receiver unit.
The GPS receiver unit receives electromagnetic signals from satellites through an antenna and
outputs time data to external devices. Through an internal receiver, the unit generates serial time
data and 1-second pulses (1PPS signals), based on the received electromagnetic signal. Each
1PPS signal occurs at the instant in time given by its accompanying frame of serial data.
To reduce the number of cables to external devices, time data and 1PPS signals are superimposed
through a mixing circuit before being output to the optical fibre.
Antenna
Receiver
Time data
Mixing Circuit
E/O
E/O
E/O
Fibre-optic Cable
Power supply
+48V
0V
Figure 3.1.1
Configuration of GPS Receiver Unit
6
1 Pulse per second
(1PPS)
E/O
E/O
E/O
Noise
DC/DC
Filter
Converter
6 F 2 S 0 7 3 8
Backup
Capacitor
E/O
E/O
Electrical-to-optical
Converter
+5V
0V
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