The contribution of multipathing effects in ground-wave radar return from the sea surface
Thesis (M.Eng.)--Memorial University of Newfoundland, 1988. Engineering and Applied Science Bibliography: leaves 69-71. The second-order ground wave spectral cross section of the ocean surface given by existing theories corresponds to the case where both theoretical scatterings occur within the boun...
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ftmemorialunivdc:oai:collections.mun.ca:theses2/43913 2023-05-15T17:23:30+02:00 The contribution of multipathing effects in ground-wave radar return from the sea surface Srivastava, Ravi Swarup Memorial University of Newfoundland. Faculty of Engineering and Applied Science 1987 xi, 98 leaves : ill. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses2/id/43913 Eng eng Electronic Theses and Dissertations (16.89 MB) -- http://collections.mun.ca/PDFs/theses/Srivastava_RaviSwarup.pdf 76082964 http://collections.mun.ca/cdm/ref/collection/theses2/id/43913 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Doppler radar Text Electronic thesis or dissertation 1987 ftmemorialunivdc 2015-08-06T19:16:35Z Thesis (M.Eng.)--Memorial University of Newfoundland, 1988. Engineering and Applied Science Bibliography: leaves 69-71. The second-order ground wave spectral cross section of the ocean surface given by existing theories corresponds to the case where both theoretical scatterings occur within the bounds of a specific area or patch of the ocean surface. Another additional term in the second-order cross section given by Walsh and Srivastava (1987), which represents the phenomenon where at least one scattering occurs outside the bounds of the patch of the ocean surface, is examined. The properties and significance of this off-patch scatter (a multi-pathing effect) are discussed. -- The off-patch spectral cross section expression is simplified for a narrow beam receiving antenna. By using suitable numerical techniques, a computer program is developed for calculating this cross section. The program is applicable for wide beam transmitting antenna. Theoretical Doppler spectra are generated for different radar frequencies and sea states to study the importance of this type of scatter. A comparison is carried out between the Doppler spectra of the above two kinds of scatter for various sea conditions to infer the effect of off-patch scatter in extraction of ocean surface parameters. Two possible cases, first when the radar is located on the open ocean and second when it is located on the beach, are considered for the comparison. -- It is determined that off-patch scatter is not significant in Doppler regions near the first-order peaks, which are commonly used to extract the ocean surface parameters. However, at some Doppler frequencies its contribution may be important as contending ocean clutter in target detection problems. Thesis Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
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Open Polar |
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Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
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ftmemorialunivdc |
language |
English |
topic |
Doppler radar |
spellingShingle |
Doppler radar Srivastava, Ravi Swarup The contribution of multipathing effects in ground-wave radar return from the sea surface |
topic_facet |
Doppler radar |
description |
Thesis (M.Eng.)--Memorial University of Newfoundland, 1988. Engineering and Applied Science Bibliography: leaves 69-71. The second-order ground wave spectral cross section of the ocean surface given by existing theories corresponds to the case where both theoretical scatterings occur within the bounds of a specific area or patch of the ocean surface. Another additional term in the second-order cross section given by Walsh and Srivastava (1987), which represents the phenomenon where at least one scattering occurs outside the bounds of the patch of the ocean surface, is examined. The properties and significance of this off-patch scatter (a multi-pathing effect) are discussed. -- The off-patch spectral cross section expression is simplified for a narrow beam receiving antenna. By using suitable numerical techniques, a computer program is developed for calculating this cross section. The program is applicable for wide beam transmitting antenna. Theoretical Doppler spectra are generated for different radar frequencies and sea states to study the importance of this type of scatter. A comparison is carried out between the Doppler spectra of the above two kinds of scatter for various sea conditions to infer the effect of off-patch scatter in extraction of ocean surface parameters. Two possible cases, first when the radar is located on the open ocean and second when it is located on the beach, are considered for the comparison. -- It is determined that off-patch scatter is not significant in Doppler regions near the first-order peaks, which are commonly used to extract the ocean surface parameters. However, at some Doppler frequencies its contribution may be important as contending ocean clutter in target detection problems. |
author2 |
Memorial University of Newfoundland. Faculty of Engineering and Applied Science |
format |
Thesis |
author |
Srivastava, Ravi Swarup |
author_facet |
Srivastava, Ravi Swarup |
author_sort |
Srivastava, Ravi Swarup |
title |
The contribution of multipathing effects in ground-wave radar return from the sea surface |
title_short |
The contribution of multipathing effects in ground-wave radar return from the sea surface |
title_full |
The contribution of multipathing effects in ground-wave radar return from the sea surface |
title_fullStr |
The contribution of multipathing effects in ground-wave radar return from the sea surface |
title_full_unstemmed |
The contribution of multipathing effects in ground-wave radar return from the sea surface |
title_sort |
contribution of multipathing effects in ground-wave radar return from the sea surface |
publishDate |
1987 |
url |
http://collections.mun.ca/cdm/ref/collection/theses2/id/43913 |
genre |
Newfoundland studies University of Newfoundland |
genre_facet |
Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (16.89 MB) -- http://collections.mun.ca/PDFs/theses/Srivastava_RaviSwarup.pdf 76082964 http://collections.mun.ca/cdm/ref/collection/theses2/id/43913 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
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1766112814569619456 |