Low-power high-resolution 3D sonar imaging system

Steven R. Broadstone; Alice M. Chiang; John Impagliazzo

doi:10.1117/12.354666

23 July 1999 Low-power high-resolution 3D sonar imaging system

Steven R. Broadstone, Alice M. Chiang, John Impagliazzo

Proceedings Volume 3711, Information Systems for Navy Divers and Autonomous Underwater Vehicles Operating in Very Shallow Water and Surf Zone Regions; (1999) https://doi.org/10.1117/12.354666
Event: AeroSense '99, 1999, Orlando, FL, United States

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.

Citation Download Citation

Steven R. Broadstone, Alice M. Chiang, and John Impagliazzo "Low-power high-resolution 3D sonar imaging system", Proc. SPIE 3711, Information Systems for Navy Divers and Autonomous Underwater Vehicles Operating in Very Shallow Water and Surf Zone Regions, (23 July 1999); https://doi.org/10.1117/12.354666

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