Azimuth estimate of ship with MUSIC algorithm
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A method of ship azimuth estimate with MUSIC algorithm is proposed in this paper. First of all, MUSIC algorithm is expatiated. Then, MUSIC algorithm and Bartlett algorithm are applied to deal with underwater experimental data and estimate the direction of arrival which can be used to figure out the azimuth of the ship. As a result, MUSIC algorithm is a more effective method than Bartlett algorithm in estimating the azimuth of ship.Keywords:
Multiple signal classification
A method of ship azimuth estimate with MUSIC algorithm is proposed in this paper. First of all, MUSIC algorithm is expatiated. Then, MUSIC algorithm and Bartlett algorithm are applied to deal with underwater experimental data and estimate the direction of arrival which can be used to figure out the azimuth of the ship. As a result, MUSIC algorithm is a more effective method than Bartlett algorithm in estimating the azimuth of ship.
Multiple signal classification
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An L-shaped array is used to estimate azimuth-elevation angles and polarisation of multiple narrow band waves. A 2-D weighted subspace filling (WSF) method is used to estimate the parameters. Performances improve above WSF without polarisation information and above other DOA methods with polarisation information such as MUSIC or Matrix-Pencil by reducing the number of snapshots and detecting coherent sources with low SNR. Its reachness to the Cramer-Rao lower bound (CRB) shows the goodness of the method.
Elevation (ballistics)
Matrix pencil
Elevation angle
Direction of arrival
Multiple signal classification
Cramér–Rao bound
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This paper presents an effective antenna array based on MUSIC algorithm for two-dimensional direction-of-arrival estimation of multiple narrow-band sources impinging on the far field of the antenna array. Compared with the previous work, the proposed array can improve the performance of MUSIC algorithm, such as it can resolve the incoming rays with very close azimuth angles or very close elevation angles. In addition, the paring of the estimated azimuth angles and elevation angles is automatically determined
Elevation (ballistics)
Elevation angle
Direction of arrival
Angle of arrival
Direction finding
Multiple signal classification
Sensor array
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Abstracting underwater target azimuth tendency feature is a common method to identify underwater target dimension. The cross-spectrum method of splitting beam is often used to abstracting underwater target azimuth tendency feature. But when the SNR is very low, this method is inefficient. In this thesis, an improved algorithm is presented to abstract underwater target azimuth tendency feature which can be used in the low SNR. In the algorithm, the underwater target highlight structure feature is used, and by least square fitting twice the underwater target azimuth tendency feature will be finally obtained. The simulation experiment results show that the proposed algorithm can be used to abstract underwater target azimuth tendency feature even when the SNR is very low. The improved algorithm has made an important foundation for further studying the feature detection and recognition of an underwater target dimension.
Feature (linguistics)
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The problem of increasing the precision of azimuth direction measurement by inclinometric systems (IS) at inclined-directional drilling of oil and gas wells inclined in small angles of about 0...5 degrees are considered. The data of the purpose and traditional structural implementation of inclinometric systems are presented. Instrumental error sources of inclinometric systems are defined. Mathematical models of the 3-component ferro-probe azimuth transducer are considered; the models of azimuth determination error are presented. Azimuth determination errors are estimated in case of the IS downhole tool orientation close to vertical using the known methods of its calculation. Dominating factors are defined, which affects the resulting value of instrumental error of azimuth definition. Mathematical models for azimuth definition are being developed, which exclude the sighting angle usage as carrying in the greatest contribution to resulting error of azimuth angle definition.
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PreviousNext No AccessSEG Technical Program Expanded Abstracts 1993Data acquistion geometry and 3‐D DMOAuthors: Paul C. YaoK. K. SekharanDan EbromPaul C. YaoUniversity of Houston, AGL, K. K. SekharanUniversity of Houston, AGL, and Dan EbromUniversity of Houston, AGLhttps://doi.org/10.1190/1.1822547 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Permalink: https://doi.org/10.1190/1.1822547FiguresReferencesRelatedDetailsCited byReferences29 April 2013 SEG Technical Program Expanded Abstracts 1993ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 1993 Pages: 1396 publication data© 1993 Copyright © 1993 Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 10 Feb 2005 CITATION INFORMATION Paul C. Yao, K. K. Sekharan, and Dan Ebrom, (1993), "Data acquistion geometry and 3‐D DMO," SEG Technical Program Expanded Abstracts : 552-554. https://doi.org/10.1190/1.1822547 Plain-Language Summary PDF DownloadLoading ...
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abstract A relation is derived for correcting dT/dΔ for a single dipping interface under a seismic array: ( d T d Δ ) = ( δ T δ Δ ) ′ sin ( Ω − ω ′ ) sin ( Ω − ω ) . The formula depends only on the azimuth angles: ω is the computed azimuth, ω′ is the observed azimuth, Ω is the azimuth of the normal to the tilted interface, and (δT/δΔ)′ is the observed quantity. The relation is explicitly independent of the dip and the velocities of the media on either side of the interface.
Interface (matter)
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Considering the azimuth discrepancy between the main and sub-inertial navigation systems (INS) for a platform-carried unmanned aerial vehicles(UAV) in case of tilted launching at a large pitch angle, an initial alignment method for improving the accuracy of the azimuth setting is proposed. First, an algorithm for computing the azimuth discrepancy is derived. Then, a mathematical model for initial alignment is established based on azimuth setting. The simulation results show that correcting the azimuth discrepancy between the main and sub-INS can greatly improve the accuracy of azimuth setting, and therefore the initial alignment accuracy of the sub-INS. Meanwhile, the drift for the gyros in three directions can be effectively estimated.
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Бұл зерттеужұмысындaКaно моделітурaлы жәнеоғaн қaтыстытолықмәліметберілгенжәнеуниверситетстуденттерінебaғыттaлғaн қолдaнбaлы (кейстік)зерттеужүргізілген.АхметЯссaуи университетініңстуденттеріүшін Кaно моделіқолдaнылғaн, олaрдың жоғaры білімберусaпaсынa қоятынмaңыздытaлaптaры, яғнисaпaлық қaжеттіліктері,олaрдың мaңыздылығытурaлы жәнесaпaлық қaжеттіліктерінеқaтыстыөз университетінқaлaй бaғaлaйтындығытурaлы сұрaқтaр қойылғaн. Осы зерттеудіңмaқсaты АхметЯсaуи университетіндетуризмменеджментіжәнеқaржы бaкaлaвриaт бaғдaрлaмaлaрыныңсaпaсынa қaтыстыстуденттердіңқaжеттіліктерінaнықтaу, студенттердіңқaнaғaттaну, қaнaғaттaнбaу дәрежелерінбелгілеу,білімберусaпaсын aнықтaу мен жетілдіружолдaрын тaлдaу болыптaбылaды. Осы мaқсaтқaжетуүшін, ең aлдыменКaно сaуaлнaмaсы түзіліп,116 студенткеқолдaнылдыжәнебілімберугежәнеоның сaпaсынa қaтыстыстуденттердіңтaлaптaры мен қaжеттіліктерітоптықжұмыстaрaрқылыaнықтaлды. Екіншіден,бұл aнықтaлғaн тaлaптaр мен қaжеттіліктерКaно бaғaлaу кестесіменжіктелді.Осылaйшa, сaпa тaлaптaры төрт сaнaтқa бөлінді:болуытиіс, бір өлшемді,тaртымдыжәнебейтaрaп.Соңындa,қaнaғaттaну мен қaнaғaттaнбaудың мәндеріесептелдіжәнестуденттердіңқaнaғaттaну мен қaнaғaттaнбaу деңгейлерінжоғaрылaту мен төмендетудеосытaлaптaр мен қaжеттіліктердіңрөліaйқын aнықтaлды.Түйінсөздер:сaпa, сaпaлық қaжеттіліктер,білімберусaпaсы, Кaно моделі.
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