NMEA status Date and time (accurate
to the second)
Lidar behavior
Unlocked (Lost) Drifting When the lidar goes from Locked to Unlocked, it starts counting from the last
synchronized time using the lidar's internal 1 Hz signal.
This absolute time will gradually drift from the actual GPS time.
PPS status μs time Lidar behavior
Unlocked (Initial) Not synchronized The lidar's internal 1 Hz signal is not aligned with the GPS second.
Locked Synchronized The rising edge of the lidar's internal 1 Hz signal is aligned with the rising edge of the PPS
signal (i.e. the start of each GPS second).
Unlocked (Lost) Drifting The lidar counts the absolute time using the internal 1 Hz signal.
This absolute time will gradually drift from the actual GPS second.
B.1.2. PTP as the clock source
•
Users can configure PTP using web control or PTC commands.
•
Users can check PTP signal status using web control or PTC commands.
•
The lidar does not output GPS Data Packets.
The absolute time is updated as follows:
PTP status Date and time (accurate
to the microsecond)
Lidar behavior
Free run Virtual Since the lidar has not been locked before, it starts counting from a virtual UTC (such as
2000–01–01 00:00:00) using the lidar's internal 1 Hz signal.
Tracking or Locked Synchronized The lidar extracts the actual date and time from the PTP Master's messages.
Pandar64
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