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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.
Figure 3.1.1 Configuration of GPS Receiver Unit
Receiver
Mixing Circuit
E/O
Antenna
1 Pulse per second
(1PPS)
E/O E/O E/O
Backup
Capacitor
Fibre-optic Cable
Noise
Filter
+5V
Power supply
DC/DC
Converter
Time data
E/O E/O E/O E/O
0V
+48V
0V
Electrical-to-optical
Converter