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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Predicting the effects of sea surface scatter on broad band pulse propagation with an ocean acoustic parabolic equation model /

Ead, Richard M. January 2004 (has links) (PDF)
Thesis (M.S. in Engineering Acoustics)--Naval Postgraduate School, June 2004. / Thesis advisor(s): Kevin B. Smith. Includes bibliographical references (p. 57-58). Also available online.
12

Implementation of an underwater digital acoustic telemetry receiver /

McAvoy, Raymond A., January 2002 (has links)
Thesis (M.S.) in Electrical Engineering--University of Maine, 2002. / Includes vita. Includes bibliographical references (leaf 104).
13

Shallow under water communication with passive phase conjugation and iterative demodulation and decoding

Keeser, Christopher Corson, January 2008 (has links) (PDF)
Thesis (M.S. in electrical engineering)--Washington State University, December 2008. / Title from PDF title page (viewed on Jan. 21, 2009). "School of Electrical Engineering and Computer Science." Includes bibliographical references (p. 51-53)
14

DESIGN AND EXPERIMENTATION WITH A SOFTWARE-DEFINED ACOUSTIC TELEMETRY MODEM

Doonan, Daniel, Fu, Tricia, Utley, Chris, Iltis, Ronald, Kastner, Ryan, Lee, Hua 10 1900 (has links)
ITC/USA 2006 Conference Proceedings / The Forty-Second Annual International Telemetering Conference and Technical Exhibition / October 23-26, 2006 / Town and Country Resort & Convention Center, San Diego, California / This paper describes the design and successful development of an acoustic modem for potential use in underwater ecological sensor networks. The presentation includes theoretical study, design and development of both software and hardware, laboratory experiments, full-scale field tests, and the documentation and analysis of field-test results.
15

Acoustic Telemetry for UUVs using Walsh/m-sequence Waveforms

Iltis, Ronald A. 10 1900 (has links)
ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada / Underwater acoustic (UWA) telemetry requires wideband waveforms for anti-multipath which are simultaneously easy to equalize and demodulate. The Walsh/m-sequence waveforms proposed here are robust to multipath and with appropriate time-guard bands do not require equalization. For example, in the UCSB prototype acoustic modem, a data rate of 133 bps is achieved using 8-ary Walsh signaling with an 11.2 msec. symbol duration. Demodulation is performed using noncoherent detection, and hence accurate phase tracking, which is difficult to achieve in the UWA channel, is not required. However, telemetry from unmanned underwater vehicles (UUVs) is more problematic due to large Doppler shifts resulting from platform motion. A new receiver algorithm based on Matching Pursuits is proposed which combines channel and Doppler shift estimation. Symbol-error rate (SER) simulation results are presented for the UWA modem under realistic Doppler/multipath conditions.
16

Undersea navigation via a distributed acoustic communications network

Hahn, Matthew J. 06 1900 (has links)
Acoustic modems are the basis for emerging undersea wireless communications networks. US Navy Seaweb technology offers an opportunity to perform undersea navigation and tracking by virtue of node-to-node ranging measurements acquired as a by-product of the acoustic communications protocol. A simple localization algorithm is developed and verified with synthetic data and is then tested with an Unmanned Undersea Vehicle (UUV) during an experiment at sea.
17

Underwater multimode directional transducer evaluation /

Sineiro, Guilherme da Silva. January 2003 (has links) (PDF)
Thesis (M.S. in Engineering Acoustics)--Naval Postgraduate School, December 2003. / Thesis advisor(s): Thomas J. Hofler, Joseph A. Rice. Includes bibliographical references (p. 53-54). Also available online.
18

Autonomous optimal rendezvous of underwater vehicles /

Nicholson, John W. January 2004 (has links) (PDF)
Thesis (Ph. D. in Mechanical Engineering)--Naval Postgraduate School, Sept. 2004. / Thesis Advisor(s): Anthony J. Healey. Includes bibliographical references (p. 123-125). Also available online.
19

Underwater Acoustic Networks : evaluation of the impact of Media Access Control on latency, in a delay constrained network /

Coelho, Jose Manuel dos Santos. January 2005 (has links) (PDF)
Thesis (M.S. in Computer Science)--Naval Postgraduate School, March 2005. / Thesis Advisor(s): Su Wen, Geoffrey Xie. Includes bibliographical references (p. 167-168). Also available online.
20

Denoising of ocean acoustic signals using wavelet-based techniques

Barsanti, Robert J. January 1996 (has links) (PDF)
Thesis (M.S. in Electrical Engineering and M.S. in Engineering Acoustics) Naval Postgraduate School, December 1996. / Thesis advisor(s): Monique P. Fargues and Ralph Hippenstiel. "December 1996." Includes bibliographical references (p. 99-101). Also available online.

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