README

Velodyne

velodyne driver runs as component, including:

1. data packet processing --> /driver
2. point cloud generation --> /convert
3. velodyne 16 fusion --> /fusion
4. compensation --> /compensator

Compensation relies on tf to query the coordination transform, so gnss_driver is required to run the velodyne components.

Output Channels

1. data packet channel: /apollo/sensor/lidar128/Scan type: apollo::drivers::velodyne::VelodyneScan proto: modules/drivers/lidar/velodyne/proto/velodyne.proto
2. point cloud channel: /apollo/sensor/lidar128/PointCloud2 type: apollo::drivers::PointCloud proto: [modules/drivers/proto/pointcloud.proto]https://github.com/ApolloAuto/apollo/blob/master/modules/drivers/proto/pointcloud.proto
3. compensation point cloud channel: /apollo/sensor/lidar128/compensator/PointCloud2 type: apollo::drivers::PointCloud proto: [modules/drivers/proto/pointcloud.proto]https://github.com/ApolloAuto/apollo/blob/master/modules/drivers/proto/pointcloud.proto

Coordination

• world
• novatel
• velodyne128

Start

Please change the parameters in the launch file for cars when you start

#in docker
cyber_launch start velodyne.launch

FAQ

1. "basetime is zero" The position pack is not valid, please check gps signal.
2. 'velodyne port 2368 poll() timeout' The network between the host and velodyne is having problem. Please use sudo tcpdump -i eth0 udp port 2368 to check if velodyne packets are received.
3. 'cannot find transform ...' Compensaton relies on tf, please double check if gnss_driver has been started, and also use cyber_monitor check /tf channel output.