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Hi @hn_on_fire

Try changing the body name, most likely you already have something called base_link to something like sensor

   <gazebo>
            <plugin name="gazebo_ros_gps" filename="libhector_gazebo_ros_gps.so">
                <alwaysOn>true</alwaysOn>
                <updateRate>100.0</updateRate>
                <robotNamespace>/bot</robotNamespace>
                <bodyName>sensor</bodyName>
                <frameId>sensor</frameId>
                <topicName>/gps/fix</topicName>
                <velocityTopicName>/gps/fix_velocity</velocityTopicName>
                <drift>0.001 0.001 0.001</drift>
                <gaussianNoise>0.05 0.05 0.05</gaussianNoise>
                <velocityDrift>0.001 0.001 0.001</velocityDrift>
                <velocityGaussianNoise>0.5 0.5 0.5</velocityGaussianNoise>

            </plugin>
        </gazebo>