Wideband Detection and Classification of Practice Limpet Mines against Various Backgrounds
Abstract
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 projector/hydrophone 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2008
- Accession Number
- AD1005174
Entities
People
- John A. Fawcett
- Richard Fleming