Adding noise to P3DX model

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Hi Ros users:

I am trying to add gaussian noise to velocities of P3DX. The model that I am using is from this source https://github.com/RafBerkvens/ua_ros... I have modified this part of code:

  <!-- ground truth -->
    <gazebo>
        <plugin name="p3d_base_controller" filename="libgazebo_ros_p3d.so">
            <alwaysOn>true</alwaysOn>
            <updateRate>100.0</updateRate>
            <bodyName>base_link</bodyName>
            <topicName>${ns}/base_pose_ground_truth</topicName>
             <gaussianNoise>0.01</gaussianNoise>
            <frameName>map</frameName>
            <!-- initialize odometry for fake localization -->
            <xyzOffsets>0 0 0</xyzOffsets>
            <rpyOffsets>0 0 0</rpyOffsets>
    <velocityGaussianNoise>10 10 10</velocityGaussianNoise>
        </plugin>
    </gazebo>

I change the part where it says "gaussiannoise nad velocityGaussianNoise" but it works in the same way.

Does anybody know how i can add gaussian noise to P3DX model??

Thank you so much.