agv_ros_ws/costmap_2d/urdf/sensors/lidar.xacro

<?xml version="1.0"?>
<robot xmlns:xacro="http://www.ros.org/wiki/xacro" name="lidar">

    <xacro:macro name="lidar" params="prefix:=laser">
        <!-- Create laser reference frame -->
        <link name="${prefix}_link">
            <inertial>
                <mass value="0.001" />
                <origin xyz="0 0 0" />
                <inertia ixx="0.001" ixy="0.0" ixz="0.0"
                         iyy="0.001" iyz="0.0"
                         izz="0.001" />
            </inertial>

            <visual>
                <origin xyz=" 0 0 0 " rpy="0 0 0" />
                <geometry>
                    <cylinder length="0.05" radius="0.05"/>
                </geometry>
                <material name="tire_mat"/>
            </visual>

            <collision>
                <origin xyz="0.0 0.0 0.0" rpy="0 0 0" />
                <geometry>
                    <cylinder length="0.06" radius="0.05"/>
                </geometry>
            </collision>
        </link>
        <gazebo reference="${prefix}_link">
            <material>Gazebo/Black</material>
        </gazebo>

        <gazebo reference="${prefix}_link">
            <sensor type="ray" name="ls01g">
                <pose>0 0 0 0 0 0</pose>
                <visualize>false</visualize>
                <update_rate>10.0</update_rate>
                <ray>
                    <scan>
                        <horizontal>
                            <samples>360</samples>
                            <resolution>1</resolution>
                            <min_angle>-3.1415926</min_angle>
                            <max_angle>3.1415926</max_angle>
                        </horizontal>
                    </scan>
                    <range>
                        <min>0.10</min>
                        <max>8.0</max>
                        <resolution>0.01</resolution>
                    </range>
                    <noise>
                        <type>gaussian</type>
                        <mean>0.0</mean>
                        <stddev>0.01</stddev> <!-- 雷达的噪声模拟  默认是0.01 -->
                    </noise>
                </ray>
                <plugin name="gazebo_ls01g" filename="libgazebo_ros_laser.so">
                    <topicName>/scan</topicName>
                    <frameName>laser_link</frameName>
                </plugin>
            </sensor>
        </gazebo>

    </xacro:macro>
    <xacro:lidar prefix="laser"/>

</robot>