Results from the DARPA and ONR synthetic aperture sonar programs

Chatham, Ralph E.; Nelson, Matthew A.; Chang, Enson

doi:10.1117/12.396268

Cited by 2 publications

(3 citation statements)

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“…DTI has shown SAS to work in shallow and deep water [1] [2][3] [4]. While this system is our first foray into the VSWJSZ on a crawling vehicle, our experience with motion estimation and autofocusing techniques means focusing an image from this system is feasible.…”

Section: Introductionmentioning

confidence: 99%

“…Since other works cover SAS processing in greater detail [1] [2][3] [4], this work will only touch upon the processing for completeness. The processing consists of three basic steps.…”

Section: Introductionmentioning

confidence: 99%

“…In the past, SAS has been used in shallow and some very shallow water and Dynamics Technology, Inc. (DTI) processed data from eleven such systems [1] [2][3] [4]. The surf zone does not posses such a pedigree.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bottom crawling synthetic aperture sonar for very shallow water mine countermeasures

Putney

Savidge²,

Chang³

et al.

MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)

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Synthetic aperture sonar (SAS) is a promising technology for rapidly detecting and classifying underwater mines. Previous SAS systems have been mounted on swimming vehicles that typically undergo smoothly varying motion. E D 0 Electro-Ceramics built a SAS for us and Foster-Miller, Inc. mounted it on one of their underwater crawling vehicles. This SAS-Crawler operates at 160 kHz, has a theoretical resolution of 2.54 cm (1 in) in range and 1.27 cm (0.5 in) in cross-range (azimuth) out to 50 m, and is intended to operate in the very shallow water and surf zones.The motion of a bottom crawling SAS is expected to be jerky as it follows the rough terrain. This presents new problems in motion estimation and correction. Furthermore, the acoustic environment, e.g., coherence properties, of the very shallow water and surf zones is less stable than the deeper waters. The slow speed of the vehicle in conjunction with a relatively high ping rate, however, yields many overlapping, or redundant, phase centers, which should help us overcome the motion estimation and coherence problems.

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Section: Introductionmentioning

confidence: 99%

“…Since other works cover SAS processing in greater detail [1] [2][3] [4], this work will only touch upon the processing for completeness. The processing consists of three basic steps.…”

Section: Introductionmentioning

confidence: 99%