C-Nav 2050, User Manual

Page: 20 / 75

2050 User Guide
GPS LED s
GPS Status
Power is off
Power is on. No satellites tracked
Tracking satellites, position not available yet
Non-differential positioning
Code based differential positioning
Dual frequency Phase positioning
Table 5: GPS Light Indication
Note – The GPS LEDs will blink at the PVT positioning rate selected (1, 2, 5, 10 and 25 Hz).
1 PPS
The 2050M has the ability to output a precise pulse every second with a relative accuracy to
within 12.5ns, and an absolute accuracy better than 100ns. The 1
PPS is 50-Ohm, TTL
level. By using the appropriate NCT proprietary command, the 1 PPS pulse width is user
configurable between 0.01 and 0.50 seconds, with the default width set to 0.10 seconds.
The delay default is set to 0.0 seconds from the
GPS zero second mark and is configurable
between 0.0 seconds and 0.999 seconds.
This precise pulse can be used for a variety of time mark applications where precise timing
is a must. The 1
PPS pulse is user configurable to sync on the rising or falling edge of the
pulse. Connecting the 1 PPS output requires a cable with a BNC male connector.
C&C P/N 425006-3 provides a 0.9m (3ft) long BNC male to BNC male connection.
2-12