for instance 5-80 Hz per 5 seconds and repeated severally. Geophones (receptors) set along the line between the trucks collect the reflected and refracted vibration coming to the ground after hitting the target material (Terra Dat 8). Reception system sends the data to a control center where the signals are processed. According to the quality of the received signal

certain environmental distractors create a particular distortion element. The analysis done at the control center involves correlation that makes various comparisons with different distortion levels. Different factors of distortions affect the quality of the signal received