An Experimental Investigation of the Performance of a New Wideband, Directional Receiver/Transmitter Sonar System
Defence R and D Canada Atlantic Dartmouth, Nova Scotia
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In this report, we describe a wideband projector4-element receiver sonar system that we constructed. The wideband projector was a medium frequency multi-mode pipe projector and four wideband rectangular 1-3 piezocomposite hydrophones were used as receive elements. The combined projectorreceiver system has a combined beamwidth of about 2 degrees at a frequency of 45 kHz. The directional characteristics depend significantly upon the frequency. Measurements of the projectors transmit voltage response TVR curves and the projectors and receive elements beampatterns were carried out at the DRDC Atlantic barge facility and are described. This wideband system was tested in the DRDC Atlantic acoustic calibration tank and at the barge in a series of target-scattering detectionclassification experiments that are described. In particular, one of the targets was a small aluminum-shelled float. A hole was drilled into the float that allowed different materials to be placed within and it was found that these resulting objects could be discriminated based on their echo. Finally, we conclude with a discussion of some of the problems that were encountered and future work.