Doppler processing of phase encoded underwater acoustic signals
Travel time of an acoustic signal from transmitter to receiver provides a great deal of information about the ocean environment. Variations in the travel time of the signal may be caused by the changes in the sound speed along the path. Since sound speed is a function of pressure, temperature and sa...
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Monterey, California: Naval Postgraduate School
1990
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ftnavalpschool:oai:calhoun.nps.edu:10945/34885 2024-06-09T07:46:34+00:00 Doppler processing of phase encoded underwater acoustic signals Eldred, Randy Michael Miller, James H. Naval Postgraduate School (U.S.) Electrical Engineering Tummala, Murali. 1990-09 viii, 99 p. ill. application/pdf https://hdl.handle.net/10945/34885 en_US eng Monterey, California: Naval Postgraduate School https://hdl.handle.net/10945/34885 This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. Acoustic tomography Fast Hadamard Transform maximal-length sequences Doppler processing Ocean tomography Underwater acoustics Doppler radar Hadamard matrices Thesis 1990 ftnavalpschool 2024-05-15T00:30:00Z Travel time of an acoustic signal from transmitter to receiver provides a great deal of information about the ocean environment. Variations in the travel time of the signal may be caused by the changes in the sound speed along the path. Since sound speed is a function of pressure, temperature and salinity, measurement of this parameter in acoustic tomography provides a means to observe ocean fluctuations through the use of inverse techniques. The upcoming Heard Island Experiment will attempt to determine the feasibility of measuring global warming by measuring changes in signal travel time that may be caused by temperature changes in the world's oceans. The signals to be transmitted in this experiment are phase encoded maximal-length sequences of various lengths which are well suited to measurement of travel time. The objectives of this thesis are to provide a software package, in C, that will allow participation as a receiver in this experiment, and to provide a general capability to process any maximal-length sequence, transmitted at any carrier frequency and with any reasonable Doppler. A background on wave propagation, maximal-length sequences, and Doppler processing are presented in this thesis. Approved for public release; distribution is unlimited. Lieutenant, United States Navy http://archive.org/details/dopplerprocessin1094534885 Thesis Heard Island Naval Postgraduate School: Calhoun Heard Island |
institution |
Open Polar |
collection |
Naval Postgraduate School: Calhoun |
op_collection_id |
ftnavalpschool |
language |
English |
topic |
Acoustic tomography Fast Hadamard Transform maximal-length sequences Doppler processing Ocean tomography Underwater acoustics Doppler radar Hadamard matrices |
spellingShingle |
Acoustic tomography Fast Hadamard Transform maximal-length sequences Doppler processing Ocean tomography Underwater acoustics Doppler radar Hadamard matrices Eldred, Randy Michael Doppler processing of phase encoded underwater acoustic signals |
topic_facet |
Acoustic tomography Fast Hadamard Transform maximal-length sequences Doppler processing Ocean tomography Underwater acoustics Doppler radar Hadamard matrices |
description |
Travel time of an acoustic signal from transmitter to receiver provides a great deal of information about the ocean environment. Variations in the travel time of the signal may be caused by the changes in the sound speed along the path. Since sound speed is a function of pressure, temperature and salinity, measurement of this parameter in acoustic tomography provides a means to observe ocean fluctuations through the use of inverse techniques. The upcoming Heard Island Experiment will attempt to determine the feasibility of measuring global warming by measuring changes in signal travel time that may be caused by temperature changes in the world's oceans. The signals to be transmitted in this experiment are phase encoded maximal-length sequences of various lengths which are well suited to measurement of travel time. The objectives of this thesis are to provide a software package, in C, that will allow participation as a receiver in this experiment, and to provide a general capability to process any maximal-length sequence, transmitted at any carrier frequency and with any reasonable Doppler. A background on wave propagation, maximal-length sequences, and Doppler processing are presented in this thesis. Approved for public release; distribution is unlimited. Lieutenant, United States Navy http://archive.org/details/dopplerprocessin1094534885 |
author2 |
Miller, James H. Naval Postgraduate School (U.S.) Electrical Engineering Tummala, Murali. |
format |
Thesis |
author |
Eldred, Randy Michael |
author_facet |
Eldred, Randy Michael |
author_sort |
Eldred, Randy Michael |
title |
Doppler processing of phase encoded underwater acoustic signals |
title_short |
Doppler processing of phase encoded underwater acoustic signals |
title_full |
Doppler processing of phase encoded underwater acoustic signals |
title_fullStr |
Doppler processing of phase encoded underwater acoustic signals |
title_full_unstemmed |
Doppler processing of phase encoded underwater acoustic signals |
title_sort |
doppler processing of phase encoded underwater acoustic signals |
publisher |
Monterey, California: Naval Postgraduate School |
publishDate |
1990 |
url |
https://hdl.handle.net/10945/34885 |
geographic |
Heard Island |
geographic_facet |
Heard Island |
genre |
Heard Island |
genre_facet |
Heard Island |
op_relation |
https://hdl.handle.net/10945/34885 |
op_rights |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. |
_version_ |
1801376496633249792 |