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Performance of real-time undifferenced precise positioning assisted by remote IGS multi-GNSS stations / Zhiqiang Liu in GPS solutions, vol 24 n° 2 (April 2020)  

Public [article]  inGPS solutions > vol 24 n° 2 (April 2020) Titre : Performance of real-time undifferenced precise positioning assisted by remote IGS multi-GNSS stations Type de document : Article/Communication Auteurs : Zhiqiang Liu, Auteur ; Dongjie Yue, Auteur ; Zhangyu Huang, Auteur Année de publication : 2020 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes descripteurs IGN] décalage d'horloge [Termes descripteurs IGN] filtre de Kalman [Termes descripteurs IGN] horloge du satellite [Termes descripteurs IGN] international GPS service for geodynamics [Termes descripteurs IGN] Nouvelle-Zélande [Termes descripteurs IGN] onde sismique [Termes descripteurs IGN] positionnement ponctuel précis [Termes descripteurs IGN] précision du positionnement [Termes descripteurs IGN] retard troposphérique zénithal [Termes descripteurs IGN] séisme [Termes descripteurs IGN] temps de convergence [Termes descripteurs IGN] temps réel Résumé : (auteur) The heavy reliance of real-time precise point positioning (RTPPP) on external satellite clock products may lead to discontinuity or even failure in time-critical applications. We present an alternative approach of real-time undifferenced precise positioning (RUP) that, by combining satellite clock estimation and precise point positioning based on the extended Kalman filter, is independent of external satellite clock corrections. The approach is evaluated in simulated real time with the assistance of a variable number of IGS multi-GNSS stations located between 1359.7 and 4852.5 km from the users. The results show that even with a single auxiliary IGS station, RUP is still feasible and able to retain centimeter-level positioning accuracy. Typically, with three auxiliary IGS stations about 2000–3000 km away, an accuracy of about 2 cm in the horizontal and 5 cm in the vertical can be achieved. The performance of RUP is comparable to that of PPP using 5-s satellite clock products and notably exhibits superior short-term precision in dealing with high-rate (1 Hz) GPS/GLONASS observations. The addition of GLONASS observations reduces the convergence time by 56.9% and improves the 3-D position accuracy by 31.8% while increasing the processing latency by a factor of about 1.6. Employing three IGS stations over 2400 km away from the epicenter, RUP is applied for the rapid determination of coseismic displacements and waveforms for the 2016 Kaikoura earthquake, yielding highly consistent results compared to those obtained from post-processed PPP in the global reference frame. We also explore its potential in facilitating real-time online services in terms of real-time precise positioning, zenith tropospheric delay retrieving, and satellite clock estimation. Numéro de notice : A2020-328 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s10291-020-0972-6 date de publication en ligne : 12/03/2020 En ligne : https://doi.org/10.1007/s10291-020-0972-6 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95209 [article]

The cause of the 2011 Hawthorne (Nevada) earthquake swarm constrained by seismic and InSAR methods / Xianjie Zha in Journal of geodesy, vol 93 n°6 (June 2019)  

Public [article]  inJournal of geodesy > vol 93 n°6 (June 2019) . - pp 899 - 909 Titre : The cause of the 2011 Hawthorne (Nevada) earthquake swarm constrained by seismic and InSAR methods Type de document : Article/Communication Auteurs : Xianjie Zha, Auteur ; Zhe Jia, Auteur ; Zhiyang Dai, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : pp 899 - 909 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes descripteurs IGN] déformation de la croute terrestre [Termes descripteurs IGN] données polarimétriques [Termes descripteurs IGN] épicentre [Termes descripteurs IGN] image radar moirée [Termes descripteurs IGN] modèle de déformation tectonique [Termes descripteurs IGN] Nevada (Etats-Unis) [Termes descripteurs IGN] onde sismique [Termes descripteurs IGN] problème inverse [Termes descripteurs IGN] séisme Résumé : (auteur) We used both seismic and InSAR data to investigate the mechanism behind the 2011 Hawthorne (Nevada) earthquake swarm that occurred between March 15 and August 17, 2011. Regional seismic data were used to estimate the centroid depth and focal mechanism for nine earthquakes that occurred in this swarm, with magnitudes between Mw3.9 and Mw4.8. The inferred focal mechanisms indicate that the source of these earthquakes is normal faulting with a small left-lateral strike-slip component along the southwest direction. Three InSAR displacement maps covering the epicentral zone of the 2011 Hawthorne earthquakes were inverted to get a slip model. The slip distribution shows that the deformation source is characterized by normal faulting, consistent with our inferred focal mechanisms. Our results suggest that the seismogenic zone was in the tensile stress environment. The temporal and spatial evolutions of seismicity suggest that the 2011 Hawthorne swarm might be caused by aseismic slip. Therefore, the 2011 Hawthorne earthquake swarm may have been the result of aseismic slip under the regional tectonic stress, and had nothing to do with volcanic activity. However, the quantitative evidence for aseismic slip is limited to the indication that the geodetic moment is 15% greater than the seismic moment, which is near the level of uncertainty. Numéro de notice : A2019-353 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-018-1212-5 date de publication en ligne : 02/11/2018 En ligne : https://doi.org/10.1007/s00190-018-1212-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93401 [article]

Real-time capturing of seismic waveforms using high-rate BDS, GPS and GLONASS observations: the 2017 Mw 6.5 Jiuzhaigou earthquake in China / Xingxing Li in GPS solutions, vol 23 n° 1 (January 2019)  

Public [article]  inGPS solutions > vol 23 n° 1 (January 2019) Titre : Real-time capturing of seismic waveforms using high-rate BDS, GPS and GLONASS observations: the 2017 Mw 6.5 Jiuzhaigou earthquake in China Type de document : Article/Communication Auteurs : Xingxing Li, Auteur ; Kai Zheng, Auteur ; Xin Li, Auteur ; et al., Auteur Année de publication : 2019 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes descripteurs IGN] Chine [Termes descripteurs IGN] forme d'onde [Termes descripteurs IGN] onde sismique [Termes descripteurs IGN] positionnement par BeiDou [Termes descripteurs IGN] positionnement par GLONASS [Termes descripteurs IGN] positionnement par GPS [Termes descripteurs IGN] positionnement ponctuel précis [Termes descripteurs IGN] temps réel Résumé : (Auteur) The rapid development of the BeiDou Satellite Navigation System (BDS) and other Global Navigation Satellite System (multi-GNSS) constellations provides a great opportunity to contribute to earthquake early warning systems in terms of capturing displacement and velocity waveforms for the estimation of magnitude and fault slip inversion. In this study, we demonstrate the capability of BDS and the benefit of multi-GNSS for real-time capturing seismic waveforms using the combined high-rate BDS + GPS + GLONASS data collected during the 2017 Mw 6.5 Jiuzhaigou earthquake. For this event, we found that the displacements, derived from BDS precise point positioning (PPP) are better than that of Global Positioning System-only (GPS) results, especially in the east and vertical components with improvements of 43% and 23%. While the velocity waveforms from BDS present a comparable performance with GPS. the multi-GNSS fusion can significantly improve the accuracy by 47%, 55%, and 28% in the east, north, and vertical components compared with GPS-only results. The BDS and multi-GNSS derived displacement waveforms agree quite well with those obtained from integrating the acceleration, with accuracy at the millimeter level. In addition, the theoretical permanent displacement field calculated from a finite-fault slip model is selected as an independent reference, and the differences between GNSS derived permanent displacements and theoretical permanent displacements are mostly less than 1 mm. Therefore, we conclude that the BDS and multi-GNSS fusion can significantly contribute to the real-time capture of accurate seismic waveforms and that it has the potential to benefit for earthquake early warning and rapid geohazard assessment. Numéro de notice : A2019-053 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s10291-018-0808-9 date de publication en ligne : 12/12/2018 En ligne : https://doi.org/10.1007/s10291-018-0808-9 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92082 [article]

Western Pyrenees geodetic deformation study using the Guipuzcoa GNSS network / Adriana Martin in Journal of applied geodesy, vol 12 n° 3 (July 2018)  

Public [article]  inJournal of applied geodesy > vol 12 n° 3 (July 2018) . - pp. 229 - 238 Titre : Western Pyrenees geodetic deformation study using the Guipuzcoa GNSS network Type de document : Article/Communication Auteurs : Adriana Martin, Auteur ; Miguel Sevilla, Auteur ; Joaquin Zurutuza, Auteur Année de publication : 2018 Article en page(s) : pp. 229 - 238 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes descripteurs IGN] analyse diachronique [Termes descripteurs IGN] Bernese [Termes descripteurs IGN] déformation de la croute terrestre [Termes descripteurs IGN] double différence [Termes descripteurs IGN] Guipuzcoa [Termes descripteurs IGN] onde sismique [Termes descripteurs IGN] Pays basque (Espagne) [Termes descripteurs IGN] Pyrénées (montagne) [Termes descripteurs IGN] réseau géodésique local Résumé : (auteur) The Basque Country in the north of Spain is located inside the Basque-Cantabrian basin of the western Pyrenees which remarkable seismic-tectonic implications justify the need of geodetic control in the area. In order to perform a crustal deformation study we have analysed all daily observations from the GNSS permanent network of Guipuzcoa and external IGS stations, from January 2007 to November 2011. We have carried out the data processing applying double differences methodology in the automatic processing module BPE (Bernese Processing Engine) from Bernese GNSS software version 5.0. Solution was aligned to geodetic reference framework ITRF2008, by using the IGS08 solution and updated satellite and terrestrial antennas calibration. This five years network study results: Coordinate time series, velocities and baseline lengths variations show internal stability among inner stations and from them with respect to outer IGS stations, concluding that no deformations have been observed. Numéro de notice : A2018-431 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1515/jag-2017-0041 date de publication en ligne : 05/04/2018 En ligne : https://doi.org/10.1515/jag-2017-0041 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90998 [article]

Theoretical and practical aspects of high-rate GNSS geodetic observations / Simon Häberling (2016)  

Public Titre : Theoretical and practical aspects of high-rate GNSS geodetic observations Type de document : Thèse/HDR Auteurs : Simon Häberling, Auteur Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2016 Autre Editeur : Zurich : Eidgenossische Technische Hochschule ETH - Ecole Polytechnique Fédérale de Zurich EPFZ Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 95 Importance : 212 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-908440-41-3 Note générale : bibliographie thesis submitted to attain the degree of doctor of sciences of ETH Zurich Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes descripteurs IGN] bruit thermique [Termes descripteurs IGN] erreur de positionnement [Termes descripteurs IGN] filtrage du signal [Termes descripteurs IGN] fréquence [Termes descripteurs IGN] onde sismique [Termes descripteurs IGN] phase [Termes descripteurs IGN] source d'erreur Index. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS  Résumé : (auteur) The main goal of the thesis is the thorough investigation and quantification of GNSS observation errors in the frequency range above 1 Hz while going to the limit of the actual receiver technology with sampling rates up to 100 sps. The potential GNSS errors in this high-frequency band are mainly caused by receiver internal error sources. Due to theoretical considerations and empirical results derived from GNSS observations of almost all available carrier signals, the carrier jitter induced by thermal noise and the receiver frequency response produced by highly dynamic motions could be detected as the two most dominant disturbances affecting high-rate GNSS observations above 1 Hz. The zero-baseline configuration (splitting the signal from one antenna to two receivers) allowed a detailed study of the carrier phase jitter and correlations between subsequent epochs dependent on different GNSS signal characteristics and baseband parameters. The size of the carrier phase jitter is directly determined by the carrier-to-noise density ratio at baseband and the corresponding loop bandwidth. Especially encrypted code sequences have a strong influence on the quality of the corresponding carrier phase component due to signal strength consuming decryption algorithms. The final consequences are a higher carrier jitter and a stronger frequency response due to the necessary PLL guiding by the strong loop signals such as GPS L1 derived from the C/A component. The impact of this higher carrier phase jitter plays a dominant role for the overall noise in the highfrequency spectrum while building the ionosphere-free linear combination. This has been demonstrated using a zero-baseline, but also a 10 m and 110 km baseline. The carrier phase jitter induced by thermal noise defines the noise level above 1 Hz. This high-frequency noise is therefore baseline independent. No significant differences between a baseline of 10 m and 110 km could be detected considering the signal spectrum between 0.01 Hz and 50 Hz. For the determination and analysis of the GNSS errors caused by high-frequency motions an experimental setup has been established consisting of a single-axis shake table as motion generator and of a well-known ground-truth defined by inductive displacement transducers. The ground-truth was validated by a strong motion seismometer with a flat frequency response carried on the shake table. With an additional precise time synchronization between all the sensors, the experiment with a mounted GNSS antenna on the shake table enabled the determination of the GNSS receiver frequency response between 1 and 20 Hz. Using different receiver types and PLL bandwidths, the amplitudes even at 3 Hz can be overestimated by about 50%, above 10 Hz also an overestimation can be observed or a reduction by well over half of the amplitude. Not only the amplitude is affected, but also the signal phase with errors between 30 and 90 degrees. This demonstrates the importance of a detailed knowledge of the loop parameters for an assessment of the expected errors, but also for applying an inverse filter in order to correct the GNSS receiver frequency response based on a simple digital PLL model. These results are relevant for all applications with strong dynamics using high-rate GNSS, such as structural health monitoring, machine guidance, navigation, and ionosphere scintillation studies. Further, seismological implications and the potential contribution of high-rate GNSS to seismology has been evaluated. Based on a moderate synthetic earthquake expected for Switzerland generated on the shake table, the sensitivity of high-rate GPS to highfrequency seismic signals using a realistic baseline length could be tested. Additionally, the receiver response has been simulated for real earthquakes in order to demonstrate the displacement errors caused by the response. Note de contenu : 1- Introduction 2- GNSS Signal Structure 3- GNSS Receiver Architecture 4- Carrier Tracking Modeling 5- Analysis of the GNSS Signal Noise 6- Shake Table Experiments 7- GNSS Receiver Response 8- Implications on Seismology and other Applications 9- Conclusions and Outlook Numéro de notice : 17461 Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : thèse : Sciences : ETHZ : 2015 DOI : 10.3929/ethz-a-010592866 En ligne : https://www.sgc.ethz.ch/sgc-volumes/sgk-95.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89687

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