Horizontal directional spectrum estimation of the Heard Island transmissions
Submitted in partial fulfillment of the requirements for the degree of Ocean Engineer at the Massachusetts Institute of Technology and Woods Hole Oceanographic Institution January 1994 In 1991 the Heard Island Feasibility Test demonstrated that it is possible to transmit coded acoustic signals nearl...
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Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
1994
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/5549 2023-05-15T16:33:54+02:00 Horizontal directional spectrum estimation of the Heard Island transmissions Traykovski, Peter A. 1994-01 application/pdf https://hdl.handle.net/1912/5549 en_US eng Massachusetts Institute of Technology and Woods Hole Oceanographic Institution WHOI Theses https://hdl.handle.net/1912/5549 doi:10.1575/1912/5549 doi:10.1575/1912/5549 Signal processing Sound Hearing Underwater acoustics Thesis 1994 ftwhoas https://doi.org/10.1575/1912/5549 2022-05-28T22:58:43Z Submitted in partial fulfillment of the requirements for the degree of Ocean Engineer at the Massachusetts Institute of Technology and Woods Hole Oceanographic Institution January 1994 In 1991 the Heard Island Feasibility Test demonstrated that it is possible to transmit coded acoustic signals nearly half way around the world. One of the key issues in the feasibility test was to determine the spatial structure of the received transmissions. In this thesis, data from the Canadian Defense Research Establishment Pacific horizontal line array is used to form an estimate of the directional power spectrum. This spectrum determines if any horizontal multipath is detectable. The preliminary signal conditioning, including frequency spectrum estimation and demodulation required before beamforming is described. Conventional and adaptive beamforming methods are examined with synthetic data to demonstrate the limitations on the directional spectrum results. The principle result of this work is that no stable horizontal multipath is evident. The mean arrival angle for the five hours of data analyzed is 212° ± 1.5°. The Office of Naval Research provided funding for the author under the ONR fellowship program. Thesis Heard Island Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Heard Island Pacific Woods Hole, MA |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Signal processing Sound Hearing Underwater acoustics |
spellingShingle |
Signal processing Sound Hearing Underwater acoustics Traykovski, Peter A. Horizontal directional spectrum estimation of the Heard Island transmissions |
topic_facet |
Signal processing Sound Hearing Underwater acoustics |
description |
Submitted in partial fulfillment of the requirements for the degree of Ocean Engineer at the Massachusetts Institute of Technology and Woods Hole Oceanographic Institution January 1994 In 1991 the Heard Island Feasibility Test demonstrated that it is possible to transmit coded acoustic signals nearly half way around the world. One of the key issues in the feasibility test was to determine the spatial structure of the received transmissions. In this thesis, data from the Canadian Defense Research Establishment Pacific horizontal line array is used to form an estimate of the directional power spectrum. This spectrum determines if any horizontal multipath is detectable. The preliminary signal conditioning, including frequency spectrum estimation and demodulation required before beamforming is described. Conventional and adaptive beamforming methods are examined with synthetic data to demonstrate the limitations on the directional spectrum results. The principle result of this work is that no stable horizontal multipath is evident. The mean arrival angle for the five hours of data analyzed is 212° ± 1.5°. The Office of Naval Research provided funding for the author under the ONR fellowship program. |
format |
Thesis |
author |
Traykovski, Peter A. |
author_facet |
Traykovski, Peter A. |
author_sort |
Traykovski, Peter A. |
title |
Horizontal directional spectrum estimation of the Heard Island transmissions |
title_short |
Horizontal directional spectrum estimation of the Heard Island transmissions |
title_full |
Horizontal directional spectrum estimation of the Heard Island transmissions |
title_fullStr |
Horizontal directional spectrum estimation of the Heard Island transmissions |
title_full_unstemmed |
Horizontal directional spectrum estimation of the Heard Island transmissions |
title_sort |
horizontal directional spectrum estimation of the heard island transmissions |
publisher |
Massachusetts Institute of Technology and Woods Hole Oceanographic Institution |
publishDate |
1994 |
url |
https://hdl.handle.net/1912/5549 |
geographic |
Heard Island Pacific |
geographic_facet |
Heard Island Pacific |
genre |
Heard Island |
genre_facet |
Heard Island |
op_source |
doi:10.1575/1912/5549 |
op_relation |
WHOI Theses https://hdl.handle.net/1912/5549 doi:10.1575/1912/5549 |
op_doi |
https://doi.org/10.1575/1912/5549 |
op_publisher_place |
Woods Hole, MA |
_version_ |
1766023640292261888 |