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Proceedings Paper

Low-power high-resolution 3D sonar imaging system
Author(s): Steven R. Broadstone; Alice M. Chiang; John Impagliazzo
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Paper Abstract

The need for multiple, cost-effective deployment of undersea acoustic mine-field reconnaissance and mine-hunting systems requires the development of light-weight, low-power, high- resolution sonars. These imaging sonars should be portable enough for use in a diver's hands or in a remote imaging sonar on an unmanned undersea vehicle in shallow waters. Under the support of the DARPA Sonoelectronics program, a system that can simultaneously focus many signals using multiple CCD/CMOS, programmable time-delay beamforming circuits connected to a sparsely-populated 2D acoustic array, is being developed. Using this approach, a real-time image could be formed to search for mine-like objects. To make a sparse array practical, the combination of low insertion loss and wide bandwidth performance is critical to realizing acceptable imaging performance with low illumination levels. In this system, a 20 cm diameter 2 MHz sparse array providing a 0.21 degree main beamwidth is proposed. Using this array, a real-time 2D cross-sectional scan of 128 X 128 pixels is achievable with a down-range and cross-range resolution of approximately 1 cm at a range of 3 m. In this paper, the signal-to-clutter ratios as a function of array bandwidth and sparse-array elements placement are presented. Furthermore, the performance of a CCD/CMOS subarray processor will be reported.

Paper Details

Date Published: 23 July 1999
PDF: 11 pages
Proc. SPIE 3711, Information Systems for Navy Divers and Autonomous Underwater Vehicles Operating in Very Shallow Water and Surf Zone Regions, (23 July 1999); doi: 10.1117/12.354666
Show Author Affiliations
Steven R. Broadstone, Teratech Corp. (United States)
Alice M. Chiang, Teratech Corp. (United States)
John Impagliazzo, Naval Undersea Warfare Ctr. (United States)

Published in SPIE Proceedings Vol. 3711:
Information Systems for Navy Divers and Autonomous Underwater Vehicles Operating in Very Shallow Water and Surf Zone Regions
Jody L. Wood-Putnam, Editor(s)

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