A characteristic feature of SONAR is the cyclic scan of the area around the ship. To model this phenomenon, the concept of intensity of sound is implemented [19]. Initially, the Acoustic Power Output or Sound Power (P) has to be calculated:
                                                                                                                               (2.1)
where,  is the Power Input and  is the Transducer efficiency, which is defined as the percentage of power output to power input. Then, the Intensity is calculated as the ratio between Sound Power (P) and the area scanned, as it is shown in Figure 2:
                                                                                                                                   (2.2)
where the area is calculated as:
                                                                                                                   (2.3)
And  is the radius of the imaginary sphere around the ship that is scanned.