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Real-time adjustment underwater positioning system for submarines / W. Cheng in Marine geodesy, vol 33 n° 2-3 (April - September 2010)  

Public [article]  inMarine geodesy > vol 33 n° 2-3 (April - September 2010) . - pp 117 - 134 Titre : Real-time adjustment underwater positioning system for submarines Type de document : Article/Communication Auteurs : W. Cheng, Auteur ; J. Jhou, Auteur Année de publication : 2010 Article en page(s) : pp 117 - 134 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] compensation [Termes IGN] ligne de base [Termes IGN] modèle géométrique [Termes IGN] modèle numérique de terrain [Termes IGN] onde acoustique [Termes IGN] positionnement cinématique en temps réel [Termes IGN] relief sous-marin [Termes IGN] sous-marin [Termes IGN] temps réel [Termes IGN] traitement automatique de données [Termes IGN] vitesse Résumé : (Auteur) A rapid real-time adjustment scheme is proposed for improving the precision of the conventional short-base line (SBL) positioning fix system used by submarines and other underwater vehicles. In the proposed approach, an initial position estimate is obtained by solving the conventional SBL tracking equations of the submarine given the assumptions of a constant speed of sound in water and a straight-line propagation path. In the first stage of the real-time adjustment procedure, this initial estimate is corrected using an iterative computation scheme based on a 3D geometry model. The improved position estimate is then used to compute a new, more accurate value of the speed of sound in water. Finally, in the second stage of the real-time adjustment procedure, the corrected speed of sound in water and the discrepancy between the original and corrected position estimates obtained in the first adjustment procedure are applied to update the coordinates of the submarine based on the second signal received from the pinger. The numerical results show that the proposed real-time adjustment system yields a significant improvement in the accuracy of the positioning fix estimates compared to those obtained from the conventional SBL method or the SBL method with the first adjustment procedure only. Numéro de notice : A2010-555 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/01490419.2010.492279 Date de publication en ligne : 16/05/2011 En ligne : https://doi.org/10.1080/01490419.2010.492279 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30747 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
230-2010021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Web-based GIS as tool for supporting marine research / Marcin Kulawiak in Marine geodesy, vol 33 n° 2-3 (April - September 2010)  

Public [article]  inMarine geodesy > vol 33 n° 2-3 (April - September 2010) . - pp 135 - 153 Titre : Web-based GIS as tool for supporting marine research Type de document : Article/Communication Auteurs : Marcin Kulawiak, Auteur ; A. Chybicki, Auteur ; M. Moszynski, Auteur Année de publication : 2010 Article en page(s) : pp 135 - 153 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] bathymétrie acoustique [Termes IGN] données multicapteurs [Termes IGN] image satellite [Termes IGN] outil d'aide à la décision [Termes IGN] sonar [Termes IGN] sondeur multifaisceaux [Termes IGN] WebSIG Résumé : (Auteur) Collecting marine data during hydroacoustic research surveys is a complex task, which not only consists of measurements but also analysis, validation, and interpretation of information acquired by various sensors. Automatic integration, visualization, and processing of collected data allow for a more precise investigation of the researched phenomena. The paper presents a dedicated Web-based system for fusion and dissemination of data from satellite imagery, hydrological measurements using CTD probes, acoustic surveys by multibeam systems, side-scan sonars and singlebeam echosounders, as well as live radar feed and oil spill spread models. The system has been designed as a tool for supporting research using the aforementioned techniques. Numéro de notice : A2010-556 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/01490419.2010.492280 Date de publication en ligne : 01/10/2012 En ligne : https://doi.org/10.1080/01490419.2010.492280 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30748 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
230-2010021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Shoreline extraction from RADARSAT-2 intensity imagery using a narrow band level set segmentation approach / Y. Shu in Marine geodesy, vol 33 n° 2-3 (April - September 2010)  

Public [article]  inMarine geodesy > vol 33 n° 2-3 (April - September 2010) . - pp 187 - 203 Titre : Shoreline extraction from RADARSAT-2 intensity imagery using a narrow band level set segmentation approach Type de document : Article/Communication Auteurs : Y. Shu, Auteur ; J. Li, Auteur ; G. Gomes, Auteur Année de publication : 2010 Article en page(s) : pp 187 - 203 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] bande spectrale [Termes IGN] extraction de traits caractéristiques [Termes IGN] image Radarsat [Termes IGN] segmentation d'image [Termes IGN] seuillage d'image [Termes IGN] trait de côte Résumé : (Auteur) This paper presents a semi-automated method for shoreline extraction from RADARSAT-2 intensity imagery. First, a preprocessing is applied to enhance the contrast of the SAR image. Second, thresholding combined with morphological filtering is employed to segment the SAR image into the land and the sea. Third, narrow band level set segmentation is implemented to refine the segmentation result. In the last step, morphological filters are utilized to eliminate any remaining spurious segments. Boundaries between the land and the sea are delineated into shorelines based on the segmentation result. Experiment on RADARSAT-2 intensity images demonstrates that the proposed method is promising. Numéro de notice : A2010-557 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/01490419.2010.496681 Date de publication en ligne : 28/04/2010 En ligne : https://doi.org/10.1080/01490419.2010.496681 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30749 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
230-2010021	RAB	Revue	Centre de documentation	En réserve L003	Disponible