Wideband Detection and Classification of Practice Limpet Mines against Various Backgrounds
Defence R and D Canada - Atlantic Dartmouth, Nova Scotia Canada
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In this experiment we placed actual practice limpet mines on a one-metre diameter disc which was suspended in the DRDC Atlantic acoustic calibration tank from a rotator pole. Two different discs were considered one, aluminum and the other fibreglass. These discs were then rotated under a fixed multi-mode pipe projector MMPP and hydrophone. The geometry was arranged so that the mineshapes would appear directly under the projectorhydrophone during the rotation. The measurements were made at 2 different disc-projector offsets and for a slightly bistatic arrangement. Various different incident pulses were considered corresponding to different frequency bands. It is shown that the mineshapes are often easily discriminated from the surrounding disc response, in terms of both the echo travel time and the characteristics temporal and spectral of the echoes.