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Geoacoustic inversions using sound f...

Giddens, Eric M.

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Geoacoustic inversions using sound from light aircraft.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Geoacoustic inversions using sound from light aircraft./
作者:	Giddens, Eric M.
面頁冊數:	253 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-04, Section: B, page: 1955.
Contained By:	Dissertation Abstracts International66-04B.
標題:	Physical Oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3171115
ISBN:	9780542078002

Geoacoustic inversions using sound from light aircraft.
Giddens, Eric M.

Geoacoustic inversions using sound from light aircraft. - 253 p.

Source: Dissertation Abstracts International, Volume: 66-04, Section: B, page: 1955.

Thesis (Ph.D.)--University of California, San Diego, 2005.

A geoacoustic inversion technique using sound generated by propeller-driven light-aircraft has been developed for applications in underwater acoustics. In its simplest form, this method uses a single sensor in the ocean and the Doppler-shifted, narrow-band component of aircraft noise to determine the acoustic properties of marine sediments. In conjunction with this work, a wavenumber integration model and a normal-mode model have been developed for an airborne, constant speed, harmonic point-source in horizontal motion over a range-independent ocean, and are capable of computing the pressure field at any receiver location as a function of time. Acoustic measurements of a variety of aircraft have been made in both static and in-flight conditions and ocean experiments have been conducted using acoustic sensors in the air, water and buried in the sediment. Using the sensor in the air, estimates can be obtained of the aircraft speed, altitude, fundamental frequency and time at the closest point of approach. From a sensor in the water column or the sediment, estimates can be obtained of the sediment sound speed and attenuation. Data have been collected for an experimental site off the coast of La Jolla, California. The sound speed estimate of 1652.3 m/s and attenuation estimate of 0.40 dB/lambda using the 79 Hz harmonic of the engine are within the range of expected values for the fine to very-fine quartz sand sediment found in this area.

ISBN: 9780542078002Subjects--Topical Terms:

1019163
Physical Oceanography.

Geoacoustic inversions using sound from light aircraft.
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502 $a Thesis (Ph.D.)--University of California, San Diego, 2005.
520 $a A geoacoustic inversion technique using sound generated by propeller-driven light-aircraft has been developed for applications in underwater acoustics. In its simplest form, this method uses a single sensor in the ocean and the Doppler-shifted, narrow-band component of aircraft noise to determine the acoustic properties of marine sediments. In conjunction with this work, a wavenumber integration model and a normal-mode model have been developed for an airborne, constant speed, harmonic point-source in horizontal motion over a range-independent ocean, and are capable of computing the pressure field at any receiver location as a function of time. Acoustic measurements of a variety of aircraft have been made in both static and in-flight conditions and ocean experiments have been conducted using acoustic sensors in the air, water and buried in the sediment. Using the sensor in the air, estimates can be obtained of the aircraft speed, altitude, fundamental frequency and time at the closest point of approach. From a sensor in the water column or the sediment, estimates can be obtained of the sediment sound speed and attenuation. Data have been collected for an experimental site off the coast of La Jolla, California. The sound speed estimate of 1652.3 m/s and attenuation estimate of 0.40 dB/lambda using the 79 Hz harmonic of the engine are within the range of expected values for the fine to very-fine quartz sand sediment found in this area.
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