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A novel approach to design measurement models of single-frequency GPS receivers for cost-effective structural monitoring networks / H. Lee in Survey review, vol 49 n° 354 (September 2017)  

Public [article]  inSurvey review > vol 49 n° 354 (September 2017) . - pp 160 - 170 Titre : A novel approach to design measurement models of single-frequency GPS receivers for cost-effective structural monitoring networks Type de document : Article/Communication Auteurs : H. Lee, Auteur ; J.O. Lee, Auteur ; A. Musa, Auteur ; H.-Y. Chen, Auteur Année de publication : 2017 Article en page(s) : pp 160 - 170 Note générale : Bibliographie Langues : Anglais (eng) Résumé : (Auteur) The global positioning system (GPS) has become an effective tool for measuring the dynamics of engineering structures from their absolute displacements. Although dual-frequency GPS receivers are widely adopted for structural monitoring applications to guarantee coordinate accuracy of the order of a few centimetres, the associated cost is too high to place larger number of these sensors. It has been recently recognised that single-frequency GPS receivers have great potential to be the smart sensors for measuring structural displacement due to their low-cost, small form-factor and low power consumption. Hence, the structural monitoring using single-frequency GPS receivers provides a much more cost-effective and compact tool for these applications; however, it remains a challenge to resolve the ambiguities rapidly and reliably. To address such a technical issue, this research focuses on design of GPS measurement models that can be effectively implemented in the structural monitoring networks. The main feature of these models is that they simultaneously model all available observables within the network, including not only GPS satellite ranging signals but also some dynamic constraints of structural monitoring networks, such as nominal coordinates and baselines of the target antennas. A series of tests has been carried out, using simulated satellite geometries and measurements, to assess impact of the proposed models on kinematic positioning performance. The results indicate that overall performance of the models that employ the single-frequency GPS observables and the dynamic constraints can be significantly improved by employing the redundant measurements. Numéro de notice : A2017-542 Affiliation des auteurs : non IGN Nature : Article DOI : 10.1080/00396265.2016.1140394 En ligne : https://doi.org/10.1080/00396265.2016.1140394 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86597 [article]

Louisiana wetland water level monitoring using retracked Topex-Poseidon altimetry / H. Lee in Marine geodesy, vol 32 n° 3 (July - September 2009)  

Public [article]  inMarine geodesy > vol 32 n° 3 (July - September 2009) . - pp 284 - 302 Titre : Louisiana wetland water level monitoring using retracked Topex-Poseidon altimetry Type de document : Article/Communication Auteurs : H. Lee, Auteur ; Alexander Braun, Auteur ; C.Y. Kuo, Auteur ; Zhong Lu, Auteur Année de publication : 2009 Article en page(s) : pp 284 - 302 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] altimétrie satellitaire par radar [Termes IGN] données altimétriques [Termes IGN] données multitemporelles [Termes IGN] données Topex-Poseidon [Termes IGN] Louisiane (Etats-Unis) [Termes IGN] marais [Termes IGN] rivière [Termes IGN] surveillance hydrologique Résumé : (Auteur) Previous studies using satellite radar altimetry to observe inland river and wetland water level changes usually spatially average high-rate (10-Hz for TOPEX, 18-Hz for Envisat) measurements. Here we develop a technique to apply retracking of TOPEX waveforms by optimizing the estimated retracked gate positions using the Offset Center of Gravity retracker. This study, for the first time, utilizes stacking of retracked TOPEX data over Louisiana wetland and concludes that the water level observed by each of 10-Hz data with along-track sampling of ~660 m exhibit variations, indicating detection of wetland dynamics. After further validations using nearby river gauges, we conclude that TOPEX is capable of measuring accurate water level changes beneath heavy-vegetation canopy region (swamp forest), and that it revealed wetland dynamic flow characteristics along track with spatial scale of 660 m or longer. Copyright Taylor & Francis Numéro de notice : A2009-449 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/01490410903094767 En ligne : https://doi.org/10.1080/01490410903094767 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30080 [article]

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