OXTS xNAV650, Руководство по оборудованию

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Please note that data logging does not work for all LiDAR. Data rates from LiDAR devices can be very
large which can be overbearing for the CPU of the xNAV650. For Velodyne LiDAR usage, a 16 laser
LiDAR will log comfortably onto the xNAV but a 32 laser LiDAR will not log correctly onto the xNAV.
3MB/s is the given specification for data recording reliably.
This setting can be enabled or disabled in the LiDAR Scanner tab of the Hardware Setup in NAVconfig.
Select the Velodyne VLP-16 as your scanner type (regardless of your
device) and then select ‘Log data’
and ‘Log telemetry’.
PPS and NMEA
Many survey devices require to receive PPS synchronisation and NMEA data. This can be easily
configured using NAVconfig. The hardware setup will also have to be made to support this via a suitable
cable. Furthermore, ensure that the PPS requirements for the device are the same as the INS output.
If you require TTL input, for example, you will need an adapter between the two devices.
In NAVconfig PPS and NMEA can be set in the LiDAR Scanner tab of the Hardware Setup section.
Choosing Velodyne VLP-16 (regardless of your device) will allow you to choose NMEA settings.
Depending on the cabling setup you have used you are able to send NMEA messages over either
ethernet or serial. For example, when using a PTP setup you will want NMEA and PTP messages to
both be sent over ethernet to the device.
There are further PPS options in the PPS/Triggers section.
Figure 12: NAVconfig LiDAR Scanner tab