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Distinguishing automatically the echoes from acoustically “hard” and “soft” objects with particular reference to the detection of fish
Abstract A method of automatically distinguishing the echoes in a sonar system which come from objects which are acoustically “hard” or “soft” is described, with particular reference to a systemExpand
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Narrow beam focused array for electronically scanned sonar: Some experimental results
Successful trials are described of a focused array, used in conjunction with a within-pulse sector-scanning sonar. The array operates at 500 kHz and is 690 wavelengths long so its 3 dB beamwidth isExpand
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