Abstract
New signal-processing techniques used in airborne active sonar systems have provided the impetus for this paper. The frequency spectrum of reverberation is needed in order to develop an optimum signal-processing system. A sea test was conducted in a 1500-fathom water-depth area to gather reverberation data. Data were gathered using a vertically directional line transducer at a depth of 60 ft. Reverberation from 1-sec-duration pulsed sine-wave sonar centered at 15.4 kHz was analyzed and the spectrum measured. Average reverberation level as a function of time curves for 100-, 10-, and 1-Hz filter bandwidths are presented. The reverberation spectrum at 2, 3, 4, 5, 6, 7, and 8 sec after the end of the pulse have been graphed and are compared to the pulse spectrum, τ sin(12Wτ)/12Wτ. The verberation spectrum is shown to be significantly wider than the pulse spectrum. The effect of scatterer velocity on volume scattering strength and a general formula for reverberation bandwidth are also presented.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
