本文主要是介绍大疆Mid360雷达使用教程总结，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
大疆Mid360雷达使用教程总结
Reference:
- https://github.com/Livox-SDK/livox_ros_driver2
1. 下载编译安装Livox-SDK2
Reference:
- https://github.com/Livox-SDK/Livox-SDK2/blob/master/README.md
下载编译安装Livox-SDK2：
git clone https://github.com/Livox-SDK/Livox-SDK2.gitcd ./Livox-SDK2/mkdir buildcd buildcmake .. && make -jsudo make install
编译生成的库文件为静态库，库文件安装路径为"/usr/local/lib"，头文件安装路径为"/usr/local/include"。
如果需要移除Livox-SDK2：
$ sudo rm -rf /usr/local/lib/liblivox_lidar_sdk_*
$ sudo rm -rf /usr/local/include/livox_lidar_*
2. 下载编译Livox ROS Driver 2
下载Livox ROS Driver 2
mkdir -p catkin_livox_ros_driver2/src/livox_ros_driver2git clone https://github.com/Livox-SDK/livox_ros_driver2.git
For ROS1
以ROS Noetic环境下编译为例：
source /opt/ros/noetic/setup.shcd catkin_livox_ros_driver2/src/livox_ros_driver2./build.sh ROS1
For ROS2 Foxy
source /opt/ros/foxy/setup.shcd catkin_livox_ros_driver2/src/livox_ros_driver2./build.sh ROS2
For ROS2 Humble
source /opt/ros/humble/setup.shsource /opt/ros/humble/setup.sh./build.sh humble
3. 运行Livox ROS Driver 2
注意，如果运行如下命令后Rviz中没有显示点云数据，则有可能是雷达配置问题。
这里需要的配置包括：
- 将点云格式设置为
PointXYZRTLT，对应参数为xfer_format=0，其位于ROS1的launch文件rviz_MID360.launch中或ROS2的launch文件rviz_MID360_launch.py中 - 设置雷达ip地址。查看雷达背后的id码，以
47MDL960020112为例，其最后两位即为当前雷达的默认ip地址，即雷达的出厂默认ip地址为192.168.1.112。对应需要设置参数为文件MID360_config.json中的ip。 - 设置目标主机ip地址，即连接雷达和雷达进行通信的主机ip地址。这里需要设置到相同网段，这里设置为
192.168.1.50，则对应需要在文件MID360_config.json中指定host_net_info的ip地址。
完整的文件MID360_config.json如下：
{"lidar_summary_info" : {"lidar_type": 8},"MID360": {"lidar_net_info" : {"cmd_data_port": 56100,"push_msg_port": 56200,"point_data_port": 56300,"imu_data_port": 56400,"log_data_port": 56500},"host_net_info" : {"cmd_data_ip" : "192.168.1.50","cmd_data_port": 56101,"push_msg_ip": "192.168.1.50","push_msg_port": 56201,"point_data_ip": "192.168.1.50","point_data_port": 56301,"imu_data_ip" : "192.168.1.50","imu_data_port": 56401,"log_data_ip" : "","log_data_port": 56501}},"lidar_configs" : [{"ip" : "192.168.1.112","pcl_data_type" : 1,"pattern_mode" : 0,"extrinsic_parameter" : {"roll": 0.0,"pitch": 0.0,"yaw": 0.0,"x": 0,"y": 0,"z": 0}}]
}
For ROS
cd catkin_livox_ros_driver2source devel/setup.shroslaunch livox_ros_driver2 rviz_MID360.launch
For ROS2
cd catkin_livox_ros_driver2source install/setup.shros2 launch livox_ros_driver2 rviz_MID360_launch.py
4. ROS1和ROS2的launch文件
ROS的启动文件位于如下目录：
catkin_livox_ros_driver2/src/livox_ros_driver2/launch_ROS1
ROS2的启动文件位于如下目录：
catkin_livox_ros_driver2/src/livox_ros_driver2/launch_ROS2
不同的启动文件对应不同的雷达和配置，并在不同的场景中使用。
| launch file name | Description |
|---|---|
| rviz_HAP.launch | Connect to HAP LiDAR device Publish pointcloud2 format data Autoload rviz |
| msg_HAP.launch | Connect to HAP LiDAR device Publish livox customized pointcloud data |
| rviz_MID360.launch | Connect to MID360 LiDAR device Publish pointcloud2 format data Autoload rviz |
| msg_MID360.launch | Connect to MID360 LiDAR device Publish livox customized pointcloud data |
| rviz_mixed.launch | Connect to HAP and MID360 LiDAR device Publish pointcloud2 format data Autoload rviz |
| msg_mixed.launch | Connect to HAP and MID360 LiDAR device Publish livox customized pointcloud data |
5. 雷达参数配置之launch文件
Livox_ros_driver2的所有内部参数配置均位于launch文件中。
如下为三个常用参数的功能描述，包括
- 设置点云发布频率，最高为100Hz
- 多个雷达时，设置每个雷达的话题名称
- 设置点云消息格式，包括
| Parameter | Detailed description | Default |
|---|---|---|
publish_freq | Set the frequency of point cloud publish Floating-point data type, recommended values 5.0, 10.0, 20.0, 50.0, etc. The maximum publish frequency is 100.0 Hz. | 10.0 |
multi_topic | If the LiDAR device has an independent topic to publish pointcloud data 0 – All LiDAR devices use the same topic to publish pointcloud data 1 – Each LiDAR device has its own topic to publish point cloud data | 0 |
xfer_format | Set pointcloud format 0 – Livox pointcloud2( PointXYZRTLT) pointcloud format 1 – Livox customized pointcloud format 2 – Standard pointcloud2 ( pcl :: PointXYZI) pointcloud format in the PCL library (just for ROS) | 0 |
设置点云发布频率
打开对应的launch文件，配置参数publish_freq
设置点云消息的数据格式
打开对应的launch文件，配置参数xfer_format。这里支持以下三种格式：
| 格式代号 | 消息类型 | 说明 |
|---|---|---|
| 0 | PointXYZRTLT | Livox pointcloud2pointcloud format |
| 1 | livox_ros_driver2::CustomMsg | Livox customized pointcloud format |
| 2 | pcl::PointXYZI | Standard pointcloud2 pointcloud format in the PCL library (just for ROS) |
其中，Livox自定义的用于支持PCL库的PointXYZRTLT点格式的定义如下：
float32 x # X axis, unit:m
float32 y # Y axis, unit:m
float32 z # Z axis, unit:m
float32 intensity # the value is reflectivity, 0.0~255.0
uint8 tag # livox tag
uint8 line # laser number in lidar
float64 timestamp # Timestamp of point
在C++中可以定义如下：
#include <pcl/point_cloud.h>
#include <pcl/point_types.h>
#include <pcl/impl/pcl_base.hpp>/*** @brief Livox Mid360 Point Type*/
namespace mid360_ros {
struct Point
{PCL_ADD_POINT4DPCL_ADD_INTENSITYstd::uint8_t tag; // livox tag --- 对于Mid360, 其取值为[0,1,2,3,4]std::uint8_t line; // laser number in lidar --- 对于Mid360, 其取值为[0,1,2,3]，即总共4条激光线，每次采样四个点的线号依次为0,1,2,3double timestamp; // 单位为ns的绝对时间戳EIGEN_MAKE_ALIGNED_OPERATOR_NEW
} EIGEN_ALIGN16;
}
POINT_CLOUD_REGISTER_POINT_STRUCT(mid360_ros::Point,(float, x, x)(float, y, y)(float, z, z)(float, intensity, intensity)(std::uint8_t, tag, tag)(std::uint8_t, line, line)(double, timestamp, timestamp)
)
另外一种Livox自定义的点云数据格式为：
std_msgs/Header header # ROS standard message header
uint64 timebase # The time of first point
uint32 point_num # Total number of pointclouds
uint8 lidar_id # Lidar device id number
uint8[3] rsvd # Reserved use
CustomPoint[] points # Pointcloud data
上述点云数据格式中的一个点的格式（CustomPoint）的定义如下：
uint32 offset_time # offset time relative to the base time
float32 x # X axis, unit:m
float32 y # Y axis, unit:m
float32 z # Z axis, unit:m
uint8 reflectivity # reflectivity, 0~255
uint8 tag # livox tag
uint8 line # laser number in lidar
设置多个雷达的点云话题
打开对应的launch文件，配置参数multi_topic
6. 雷达参数配置之Json文件
修改雷达的IP、端口
Lidar的IP和端口等设置位于config文件夹下的json-style的配置文件中。
参数说明如下：
| Parameter | Type | Description | Default |
|---|---|---|---|
ip | String | Ip of the LiDAR you want to config | 192.168.1.100 |
pcl_data_type | Int | Choose the resolution of the point cloud data to send 1 – Cartesian coordinate data ( 32 bits) 2 – Cartesian coordinate data ( 16 bits) 3 --Spherical coordinate data | 1 |
pattern_mode | Int | Space scan pattern 0 – non-repeating scanning pattern mode 1 – repeating scanning pattern mode 2 – repeating scanning pattern mode (low scanning rate) | 0 |
blind_spot_set (Only for HAP LiDAR) | Int | Set blind spot Range from 50 cm to 200 cm | 50 |
extrinsic_parameter | Set extrinsic parameter The data types of “roll” “picth” “yaw” are float The data types of “x” “y” “z” are int |
示例如下：
{"lidar_summary_info" : {"lidar_type": 8 # protocol type index, please don't revise this value},"HAP": {"device_type" : "HAP","lidar_ipaddr": "","lidar_net_info" : {"cmd_data_port": 56000, # command port"push_msg_port": 0,"point_data_port": 57000,"imu_data_port": 58000,"log_data_port": 59000},"host_net_info" : {"cmd_data_ip" : "192.168.1.5", # host ip (it can be revised)"cmd_data_port": 56000,"push_msg_ip": "","push_msg_port": 0,"point_data_ip": "192.168.1.5", # host ip"point_data_port": 57000,"imu_data_ip" : "192.168.1.5", # host ip"imu_data_port": 58000,"log_data_ip" : "","log_data_port": 59000}},"lidar_configs" : [{"ip" : "192.168.1.100", # ip of the LiDAR you want to config"pcl_data_type" : 1,"pattern_mode" : 0,"blind_spot_set" : 50,"extrinsic_parameter" : {"roll": 0.0,"pitch": 0.0,"yaw": 0.0,"x": 0,"y": 0,"z": 0}}]
}
当连接多个激光雷达时，将不同激光雷达对应的对象添加到 “lidar_configs” 数组中即可。
示例如下：
{"lidar_summary_info" : {"lidar_type": 8 # protocol type index, please don't revise this value},"HAP": {"lidar_net_info" : { # HAP ports, please don't revise these values"cmd_data_port": 56000, # HAP command port"push_msg_port": 0,"point_data_port": 57000,"imu_data_port": 58000,"log_data_port": 59000},"host_net_info" : {"cmd_data_ip" : "192.168.1.5", # host ip"cmd_data_port": 56000,"push_msg_ip": "","push_msg_port": 0,"point_data_ip": "192.168.1.5", # host ip"point_data_port": 57000,"imu_data_ip" : "192.168.1.5", # host ip"imu_data_port": 58000,"log_data_ip" : "","log_data_port": 59000}},"MID360": {"lidar_net_info" : { # Mid360 ports, please don't revise these values"cmd_data_port": 56100, # Mid360 command port"push_msg_port": 56200,"point_data_port": 56300,"imu_data_port": 56400,"log_data_port": 56500},"host_net_info" : {"cmd_data_ip" : "192.168.1.5", # host ip"cmd_data_port": 56101,"push_msg_ip": "192.168.1.5", # host ip"push_msg_port": 56201,"point_data_ip": "192.168.1.5", # host ip"point_data_port": 56301,"imu_data_ip" : "192.168.1.5", # host ip"imu_data_port": 56401,"log_data_ip" : "","log_data_port": 56501}},"lidar_configs" : [{"ip" : "192.168.1.100", # ip of the HAP you want to config"pcl_data_type" : 1,"pattern_mode" : 0,"blind_spot_set" : 50,"extrinsic_parameter" : {"roll": 0.0,"pitch": 0.0,"yaw": 0.0,"x": 0,"y": 0,"z": 0}},{"ip" : "192.168.1.12", # ip of the Mid360 you want to config"pcl_data_type" : 1,"pattern_mode" : 0,"extrinsic_parameter" : {"roll": 0.0,"pitch": 0.0,"yaw": 0.0,"x": 0,"y": 0,"z": 0}}]
}
修改雷达的扫描模式 — 不支持
很遗憾，从官方Github上的issues看，MID360当前尚不支持重复扫描模式，即只支持默认的非重复扫描模式！尝试修改pattern_mode参数并不会起作用。
具体可见：
- https://github.com/Livox-SDK/livox_ros_driver2/issues/36
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