جستجوی مقالات مرتبط با کلیدواژه « Transmission losses » در نشریات گروه « مهندسی دریا »

In this study, the manner of performance acoustic equipment using active sonar equations, for both the northern and southern areas of the Caspian Sea were studied in the spring. In this study, acoustic wave equation was solved through a ray theory in 40 KHz frequency, then environment transmission losses were calculated. Then a hypothetical object with the strength 12 dB in distance 9km from the acoustic source at a depth of 5 meters was installed, The transmission loss the return signal at the receiver at the location of the acoustic source were installed at depths of 50.5 and 300 meters, were calculated, The results showed that at North Station, when the receiver at a depth of 5 meters at the site of transmission, is installed, The return signal from the body in about -50 dB show transmission losses compared to South Station, but in the lower depths of 50 meters, about -15 db was observed.