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Synthetic Aperture Processing of Wideband Scattering Measurements Made in the DRDC Atlantic Acoustic Calibration Tank

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Technical Report

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Defence R and D Canada - Atlantic Dartmouth, Nova Scotia Canada

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In this experiment we placed various objects, including 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 MMPP projector and hydrophone. The geometry was arranged so that the mineshapes would appear directly under the projectorhydrophoneduring the rotation. The time series data and the corresponding spectra were presented and used for detection and classification experiments in another DRDC Atlantic technical memorandum. In this report, we consider the beamforming of the time series. There was only a single hydrophone used as a receiver so that the array for the beamforming is constructed using the motion of the disc with respect to the hydrophone. Examples of the scattered time series before and after beamforming will be presented.

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