Low Power Beamforming for Underwater Acoustic Sensing Using a 5-Element Circular Hydrophone Array

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Authors
  1. McIntyre, G.
  2. Loadman, C.
  3. Bousquet, J.-F.
  4. Blouin, S.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN);DALHOUSIE UNIV, HALIFAX NS (CAN) DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
Abstract
In this paper we present a technique for underwater acoustic beamforming based on soundfield recording that encodes both the temporal and spatial characteristics of a signal. Here, we introduce the basic theory behind soundfield recording and present a first-order beamformer that beamforms the encoded data in a specific direction (scientific characters) and with a variable polar pattern, p. The appeal of this beamformer being that a 2-dimensional beam can be created using only 4 multiplications and 2 additions. A method for implementing a wideband, planar soundfield recorder using a 5-element array is then discussed. Results from underwater experimental trials using this 5-element array are then presented that compare the measured beam patterns and frequency response of the physical beamformer to the ideal, theoretical beam patterns and frequency response.
Report Number
DRDC-RDDC-2015-N049 — External Literature
Date of publication
28 Aug 2015
Number of Pages
8
DSTKIM No
CA040779
CANDIS No
802009
Format(s):
Electronic Document(PDF)

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