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An offshore real-time precise point positioning technique based on a single set of BeiDou short-message communication devices / Zhixi Nie in Journal of geodesy, vol 94 n° 9 (September 2020)  

Public [article]  inJournal of geodesy > vol 94 n° 9 (September 2020) . - n° 78 Titre : An offshore real-time precise point positioning technique based on a single set of BeiDou short-message communication devices Type de document : Article/Communication Auteurs : Zhixi Nie, Auteur ; Boyang Wang, Auteur ; Zhenjie Wang, Auteur ; Kaifei He, Auteur Année de publication : 2020 Article en page(s) : n° 78 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] correction [Termes IGN] horloge du satellite [Termes IGN] international GPS service for geodynamics [Termes IGN] positionnement par GNSS [Termes IGN] positionnement ponctuel précis [Termes IGN] temps réel Résumé : (auteur) Real-time precise point positioning (PPP) based on open-access real-time service (RTS) of the international GNSS service (IGS) has attracted increasing attention in recent years. For offshore applications, the receiving of RTS corrections becomes a major obstacle due to lack of internet-based infrastructures. Short-message communication (SMC) is a particular technique of BeiDou navigation satellite system (BDS), which can provide bidirectional communication between users in a cost-effective way. However, the limited bandwidth and frequency of BDS SMC make it impossible to directly broadcast IGS RTS corrections with BDS SMC. An offshore real-time PPP technique is proposed based on IGS RTS corrections with a single set of BDS SMC devices for communication. RTS orbit corrections in the along-track, cross-track and radial directions, the clock correction and the code bias correction of each satellite are together converted into an equivalent range correction on the basis of user approximate position and will-be-used code observation types. The range corrections within 1 min are fitted into a first-order polynomial. Only the range and range-rate corrections at the reference time are broadcast with BDS SMC. In addition, different from broadcasting corrections of all satellites in the IGS RTS, corrections of only visible satellites are encoded into a BDS SMC correction message to further reduce the data size. The encoding strategy of BDS SMC correction message and a detailed procedure of the offshore real-time PPP technique are presented. The land-simulated and offshore experiment results show that the proposed technique can meet the demands of high-precision offshore applications. Numéro de notice : A2020-543 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-020-01411-6 Date de publication en ligne : 08/08/2020 En ligne : https://doi.org/10.1007/s00190-020-01411-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95745 [article]

GNSS navigation and positioning for the GEOHALO experiment in Italy / Kaifei He in GPS solutions, vol 20 n° 2 (April 2016)  

Public [article]  inGPS solutions > vol 20 n° 2 (April 2016) . - pp 215 - 224 Titre : GNSS navigation and positioning for the GEOHALO experiment in Italy Type de document : Article/Communication Auteurs : Kaifei He, Auteur ; Guochang Xu, Auteur ; Tianhe Xu, Auteur ; Frank Flechtner, Auteur Année de publication : 2016 Article en page(s) : pp 215 - 224 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] gravimétrie aérienne [Termes IGN] Italie [Termes IGN] positionnement cinématique [Termes IGN] positionnement par GNSS Résumé : (Auteur) GEOHALO is a joint experiment of several German institutes for atmospheric research and earth observation where exploring airborne gravimetry over Italy using the High Altitude and LOng Range (HALO) aircraft data is one of the major goals. The kinematic positioning of the aircraft, on which all remote sensing instruments are located, by Global Navigation Satellite System (GNSS) is affected by the characteristics of long-distance, long-time duration, and high-platform dynamics which are a key factor for the success of the GEOHALO project. We outline the strategy and method of GNSS data processing which takes into account multiple GNSS systems (GPS and GLONASS), multiple static reference stations including stations from the International GNSS Service (IGS) and the EUropean REFerence network (EUREF), multiple GNSS-receiving equipments mounted on the kinematic platform, geometric relations between multiple antennas, and assumptions of similar characteristic of atmospheric effects within a small area above the aircraft. From this precondition, various data processing methods for kinematic positioning have been developed, applied and compared. It is shown that the proposed method based on multiple reference stations and multiple kinematic stations with a common atmospheric delay parameter can effectively improve the reliability and accuracy of GNSS kinematic positioning. Numéro de notice : A2016-612 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-014-0430-4 En ligne : http://dx.doi.org/10.1007/s10291-014-0430-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81811 [article]

GNSS kinematic position and velocity determination for airborne gravimetry / Kaifei He (2015)  

Public Titre : GNSS kinematic position and velocity determination for airborne gravimetry Type de document : Thèse/HDR Auteurs : Kaifei He, Auteur Editeur : Postdam : GeoForschungsZentrum Postdam Année de publication : 2015 Collection : Scientific technical reports num. 15-04 Importance : 187 p. Format : 21 x 30 cm Note générale : bibliographie zur Erlangung des akademischen Grades Doktor der Ingenieurwissenschaften – Dr.-Ing. – genehmigte Dissertation Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] gravimétrie aérienne [Termes IGN] positionnement cinématique [Termes IGN] positionnement par GNSS [Termes IGN] positionnement ponctuel précis [Termes IGN] station de référence [Termes IGN] vitesse Mots-clés libres : GNSS, Kinematic Precise Positioning  Airborne Gravimetry  Least Squares  Nuisance Parameter Elimination  Two-way Kalman filter  Receiver Clock Error  Multiple Reference Stations  Robust Estimation  Multiple kinematic Stations  A Priori Distance Constraint  Common Troposphere Parameterization  GNSS Integration  Helmert’s Variance Components Estimation  Doppler Velocity Determination  GEOHALO  HALO  HALO_GNSS Résumé : (auteur) The Global Navigation Satellite System (GNSS) plays a significant role in the fields of airborne gravimetry. The objective of this thesis is to develop reliable GNSS algorithms and software for kinematic highly precise GNSS data analysis in airborne gravimetry. Based on the requirements for practical applications in airborne gravimetry and shipborne gravimetry projects, the core research and the contributions of this thesis are summarized. […] Note de contenu : 1 Introduction 2 GNSS Observations and Error Sources 3 Algorithms Developing and Quality Analysis for GNSS Kinematic Positioning 4 Kinematic Positioning Based on Multiple Reference Stations 5 Kinematic Positioning Based on Multiple Kinematic Stations 6 Kinematic Positioning Based on GNSS Integration 7 GNSS Velocity Determination Based on the Doppler Effect 8 Software Development and Application 9 Summary and Future Work Numéro de notice : 16181 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : mémoire de docteur-ingénieur : sciences de l'ingénieur : Université technique de Berlin : 2015 DOI : 10.2312/GFZ.b103-15044 En ligne : https://doi.org/10.2312/GFZ.b103-15044 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75987