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Improvement of GPS/acoustic seafloor positioning precision through controlling the ship’s track line / M. Sato in Journal of geodesy, vol 87 n° 9 (September 2013)  

Public [article]  inJournal of geodesy > vol 87 n° 9 (September 2013) . - pp 825 - 842 Titre : Improvement of GPS/acoustic seafloor positioning precision through controlling the ship’s track line Type de document : Article/Communication Auteurs : M. Sato, Auteur ; M. Fujita, Auteur ; Y. Matsumoto, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 825 - 842 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] bathymétrie acoustique [Termes IGN] cable [Termes IGN] fond marin [Termes IGN] GPS assisté pour la navigation (technologies) [Termes IGN] Japon [Termes IGN] lever bathymétrique [Termes IGN] navigation maritime [Termes IGN] navire [Termes IGN] positionnement par GPS [Termes IGN] précision du positionnement [Termes IGN] sondeur acoustique Résumé : (Auteur) The precision of GPS/acoustic seafloor positioning was improved by introducing a hull-mounted onboard system in March 2008, which allows us to conduct acoustic ranging measurements with the vessel sailing along the pre-determined track lines, while the early system before 2008 could only adopt the uncontrollable drifting observation. The continuity of the positioning results due to the transition was first confirmed through the comparison between results from sailing and drifting observations conducted in parallel. Using the data acquired for about 3 years since 2008, the repeatability of the determined position for the sailing observation was evaluated to be about 2 cm in root mean squares in the horizontal component, significantly better than that for the early drifting observation. The improvement of positioning precision probably resulted from the improvement of geometric distribution of acoustic ranging data by controlling the track lines. It was also shown that the sailing observation allows to obtain reliable results with a smaller amount of data. Comparison between the results in different sea regions suggests that positioning precision is better in the region along the Nankai Trough than in the region along the Japan Trench, probably because of the complicated acoustic velocity structure of seawater often observed in the latter. Furthermore, the precision of height determination was also improved, which leads us to expect that vertical crustal movement will be detectable in the future through accumulation of data as well as further technology development. Numéro de notice : A2013-564 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-013-0649-9 Date de publication en ligne : 02/07/2013 En ligne : https://doi.org/10.1007/s00190-013-0649-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32700 [article]

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Comparison of L- and X-band PolSAR data for characterization of polarization orientation angle shift induced by man-made structure / K. Iribe (2007) 

Public Titre : Comparison of L- and X-band PolSAR data for characterization of polarization orientation angle shift induced by man-made structure Type de document : Article/Communication Auteurs : K. Iribe, Auteur ; M. Sato, Auteur Editeur : Paris : Agence Spatiale Européenne ASE / European Space Agency ESA Année de publication : 2007 Collection : ESA Specialist Panel, ISSN 1609-042X num. 644 Conférence : POLinSAR 2007, 3rd International Workshop on Science and Applications of SAR Polarimetry and Polarimetric Interferometry 22/01/2007 26/01/2007 Frascati Italie OA Proceedings Importance : 6 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] analyse comparative [Termes IGN] bande L [Termes IGN] bande X [Termes IGN] détail topographique artificiel [Termes IGN] données polarimétriques [Termes IGN] image radar moirée [Termes IGN] Japon [Termes IGN] milieu urbain [Termes IGN] polarimétrie radar [Termes IGN] polarisation [Termes IGN] Sendaï Résumé : (Auteur) In this paper, we offer an overview of the frequency characteristics on the polarization orientation angle shifts induced by Man-made structures. Nowadays, it is recognized that this parameter is closely related to the target azimuth slope. The algorithm to estimate the orientation angle shifts from polarimetric SAR data of urban area was suggested. By means of this algorithm, we compare longer wavelength L-band and shorter wavelength X-band polarimetric SAR measurements over the same area to understand what useful information can be derived from these measurements. In addition, we examine the similarities and differences of these datasets acquired with different frequency bands. The overview is demonstrated by JAXA L-band and NICT X-band Pi-SAR data over Sendai city, Japan. Numéro de notice : 13579 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64265

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