synchronization between devices. Compared with various existing time synchronization
mechanisms, PTP has the following advantages:
1) Compared with NTP (Network Time Protocol), PTP can meet higher-precision time
synchronization requirements. NTP can generally only achieve sub-second time synchronization
accuracy, while PTP can reach sub-microsecond time synchronization accuracy.
2) Compared with GPS (Global Positioning System), PTP has lower construction and maintenance
costs, and can be used independently from the GPS.
5.6.4 PTP wiring Method
To use the PTP synchronization method, you need to make the following preparations, and then
connect according to the connection method shown in the figure below:
1) Select PTP mode in the web interface (please see Appendix A.2 Web Interface configuration);
2) Prepare a PTP Master timing host (plug and play, no additional configuration required);
3) Ethernet switch;
4) Device supporting PTP protocol
Figure 10 PTP Connecting Diagram
Note:
1. The PTP Master timing equipment is a third-party equipment that needs to be purchased by the user
independently, which is not included in the RoboSense standard product shipping package.
2. As a PTP Slave device, our LiDAR only obtains the time sent by the PTP Master, and does not make accuracy
judgments. If the time of the LiDAR deviates from the real time, please check whether the time provided by the PTP
Master is accurate;
3. After the LiDAR is synchronized, the PTP Master is disconnected, and the time in the point cloud data packet will
be superimposed according to the LiDAR's internal clock, and it will be reset after the LiDAR is powered off and
restarted.
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