Development of a Modified Time Delay Spectrometry Technique for Underwater Acoustic Measurements in a Multipath Environment PDF Download
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Languages : en
Pages : 0
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A measurement technique has been developed which makes possible the determination of the acoustic transmission loss for various paths between a source and a receiver at relatively short ranges in the ocean. The method is based upon a technique called Time Delay Spectrometry (TDS). The theory for utilizing TDS to perform measurements on an underwater test range with a homogeneous water column is presented. The experimental parameters concerning test geometry together with criteria for the source signal are discussed and the limitations are described. A computer program written in HP BASIC is the tool in a multipath measurement system where analog sound signals recorded on tape are processed by an HP 356A Dynamic Signal Analyzer under program control. Originator-supplied keywords include: Time Delay Spectrometry (TDS), Under water acoustic propagation, Dynamic signal analyzer, Linear frequency modified pulse (LFM pulse).
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Category :
Languages : en
Pages : 0
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Book Description
A measurement technique has been developed which makes possible the determination of the acoustic transmission loss for various paths between a source and a receiver at relatively short ranges in the ocean. The method is based upon a technique called Time Delay Spectrometry (TDS). The theory for utilizing TDS to perform measurements on an underwater test range with a homogeneous water column is presented. The experimental parameters concerning test geometry together with criteria for the source signal are discussed and the limitations are described. A computer program written in HP BASIC is the tool in a multipath measurement system where analog sound signals recorded on tape are processed by an HP 356A Dynamic Signal Analyzer under program control. Originator-supplied keywords include: Time Delay Spectrometry (TDS), Under water acoustic propagation, Dynamic signal analyzer, Linear frequency modified pulse (LFM pulse).
Author: Bjoern Brekke
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 96
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Book Description
A measurement technique has been developed which makes possible the determination of the acoustic transmission loss for various paths between a source and a receiver at relatively short ranges in the ocean. The method is based upon a technique called Time Delay Spectrometry (TDS). The theory for utilizing TDS to perform measurements on an underwater test range with a homogeneous water column is presented. The experimental parameters concerning test geometry together with criteria for the source signal are discussed and the limitations are described. A computer program written in HP BASIC is the tool in a multipath measurement system where analog sound signals recorded on tape are processed by an HP 356A Dynamic Signal Analyzer under program control. Originator-supplied keywords include: Time Delay Spectrometry (TDS), Under water acoustic propagation, Dynamic signal analyzer, Linear frequency modified pulse (LFM pulse).
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Category : Aeronautics
Languages : en
Pages : 892
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Author: Louis L. Prudhomme
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Category :
Languages : en
Pages : 62
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Book Description
The analysis of sound propagating by multiple paths in an ocean at short ranges has been conducted using a Modified Time Delay Spectrometry (TDS) technique. In this version of TDS, a source driven by a linear FM slide and an HP3561A Dynamic Signal Analyzer are used to measure the amplitude as a function of frequency of signals traveling by different paths and having different arrival times. Two sets of data from the acoustic test ranges at the Naval Undersea Weapons Engineering Station were analyzed for different environment conditions to determine the relative amplitudes of the directly propagating and surface reflected signals. Comparisons with simple rough surface scattering theory showed reasonable agreement. Results and control software are presented and discussed. Recommendations for future applications are made. Keywords: Multipath acoustic propagation; Time delay spectrometry; Surface reflection; Theses.
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Category : Marine biology
Languages : en
Pages : 672
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Category : Science
Languages : en
Pages : 716
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ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 954
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ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 976
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Author: Frederick E. White
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ISBN:
Category : Acoustical engineering
Languages : en
Pages : 496
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Author:
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ISBN:
Category : Physics
Languages : en
Pages : 790
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