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Maximum likelihood estimates of azim...

Warin, Raphael.

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Maximum likelihood estimates of azimuth and elevation for a frequency-hopped active source using a tetrahedral ultra-short baseline.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Maximum likelihood estimates of azimuth and elevation for a frequency-hopped active source using a tetrahedral ultra-short baseline./
Author:	Warin, Raphael.
Description:	149 p.
Notes:	Source: Masters Abstracts International, Volume: 42-05, page: 1843.
Contained By:	Masters Abstracts International42-05.
Subject:	Engineering, Marine and Ocean. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1419381
ISBN:	0496241516

Maximum likelihood estimates of azimuth and elevation for a frequency-hopped active source using a tetrahedral ultra-short baseline.
Warin, Raphael.

Maximum likelihood estimates of azimuth and elevation for a frequency-hopped active source using a tetrahedral ultra-short baseline. - 149 p.

Source: Masters Abstracts International, Volume: 42-05, page: 1843.

Thesis (M.S.)--Florida Atlantic University, 2004.

Ultra-Short-BaseLine (USBL) is the most practical underwater acoustic positioning system for autonomous underwater vehicles because of its small space requirement. The objective of this research is to develop a USBL system capable of estimating a source location transmitting frequency-hopped tones sequences. Such sequences are characteristic of spread spectrum signaling used in underwater acoustic communication network. It must be able to provide azimuth and elevation of a modem-type source with an accuracy of 0.3° for both angles using the synchronization stage of the transmission. The acoustic antenna is composed of four transducers arranged as a tetrahedron. Using the model of Quazi and Lerro, which provides an expression for the variance of the bearing angle, azimuth and elevation of the transmitter are estimated employing maximum likelihood estimation. This system is simulated, tested and calibrated in a tank. Simulated results satisfy the requirement with a SNR of 32dB and 8 symbols. The latest experimental measurements present an accuracy of 3°.

ISBN: 0496241516Subjects--Topical Terms:

1019064
Engineering, Marine and Ocean.

Maximum likelihood estimates of azimuth and elevation for a frequency-hopped active source using a tetrahedral ultra-short baseline.
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035 $a (UnM)AAI1419381
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040 $a UnM $c UnM
100 1 $a Warin, Raphael. $3 1937834
245 1 0 $a Maximum likelihood estimates of azimuth and elevation for a frequency-hopped active source using a tetrahedral ultra-short baseline.
300 $a 149 p.
500 $a Source: Masters Abstracts International, Volume: 42-05, page: 1843.
500 $a Adviser: Pierre-Philippe Beaujean.
502 $a Thesis (M.S.)--Florida Atlantic University, 2004.
520 $a Ultra-Short-BaseLine (USBL) is the most practical underwater acoustic positioning system for autonomous underwater vehicles because of its small space requirement. The objective of this research is to develop a USBL system capable of estimating a source location transmitting frequency-hopped tones sequences. Such sequences are characteristic of spread spectrum signaling used in underwater acoustic communication network. It must be able to provide azimuth and elevation of a modem-type source with an accuracy of 0.3° for both angles using the synchronization stage of the transmission. The acoustic antenna is composed of four transducers arranged as a tetrahedron. Using the model of Quazi and Lerro, which provides an expression for the variance of the bearing angle, azimuth and elevation of the transmitter are estimated employing maximum likelihood estimation. This system is simulated, tested and calibrated in a tank. Simulated results satisfy the requirement with a SNR of 32dB and 8 symbols. The latest experimental measurements present an accuracy of 3°.
590 $a School code: 0119.
650 4 $a Engineering, Marine and Ocean. $3 1019064
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Physics, Acoustics. $3 1019086
690 $a 0547
690 $a 0544
690 $a 0986
710 2 0 $a Florida Atlantic University. $3 1017837
773 0 $t Masters Abstracts International $g 42-05.
790 1 0 $a Beaujean, Pierre-Philippe, $e advisor
790 $a 0119
791 $a M.S.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1419381