Anomalous frequency behavior in low-frequency sea-surface backscatter

Anomalous frequency behavior in low-frequency sea-surface backscatter

Surface backscattering strengths have been measured between 70 and 1500 Hz using broadband SUS charges as sources in the Critical Sea Test 7 at-sea test. While the results of the measurements for frequencies of 1 kHz and below have been presented previously, the extension of the results up to 1.5 kH...

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Veröffentlicht in:The Journal of the Acoustical Society of America 1994-05, Vol.95 (5_Supplement), p.3019-3019
Hauptverfasser: Ogden, Peter M., Erskine, Fred T., Nicholas, Michael
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container_issue 5_Supplement
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container_title The Journal of the Acoustical Society of America
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creator Ogden, Peter M.
Erskine, Fred T.
Nicholas, Michael
description Surface backscattering strengths have been measured between 70 and 1500 Hz using broadband SUS charges as sources in the Critical Sea Test 7 at-sea test. While the results of the measurements for frequencies of 1 kHz and below have been presented previously, the extension of the results up to 1.5 kHz have shown some unexpected frequency behavior in the scattering strengths as a function of wind speed. For wind speeds of 15 m/s and higher, scattering strengths at a fixed grazing angle are found to peak in the 600- to 1000-Hz region and then decline with increasing frequency, while for lower wind speeds the scattering strengths increase roughly monotonically with increasing frequency. Possible explanations for this behavior will be discussed. [Work supported by ONR.]
doi_str_mv 10.1121/1.408773
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title Anomalous frequency behavior in low-frequency sea-surface backscatter
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