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more than 1 ms.
6.3 gPTP Synchronization
Generalized Precise Time Protocol (gPTP) is derived from Precise Time Protocol
(PTP) and is used to synchronize the time of individual devices within a local
area network with high precision.
This series of lidar supports gPTP timing synchronization. Before synchronizing
the lidar via gPTP, the time source needs to be set to “PTP” in the lidar's point
cloud display software.
The steps are as follows: open the point cloud display software, click on
“parameter” to bring up the parameter modification window, change “Source
Selection” to “PTP” as shown in the figure below.
Note:
When PTP is selected as the clock source, the lidar no longer outputs GPS
packets and the time unit changes to nanoseconds (ns). The Timestamp and
Date & Time in the point cloud packets will be synchronized strictly according
to the time signal provided by the PTP master clock.
If PTP has been selected as the time source and no PTP master clock is currently
available, the lidar will start timing from the internal default start time (00:00:00
on 1 January 2000); if a PTP time source is provided and then interrupted, the
lidar will continue timing from the time of the interruption.
6.4 Lidar Internal Timing
When there is no GPS and other equipment to synchronize, the Lidar uses 1
hour (3,600*10
6
μs) as the cycle. With the microsecond as the timing unit, the
timing value is output as the time stamp of the data packet. At this time, there is
no UTC time reference. If UTC time is required, it must be written in the
configuration package, otherwise the UTC time output information of the device
package is invalid.
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