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Analysis of orbital configurations for geocenter determination with GPS and low-Earth orbiters / Da Kuang in Journal of geodesy, vol 89 n° 5 (May 2015)  

Public [article]  inJournal of geodesy > vol 89 n° 5 (May 2015) . - pp 471 - 481 Titre : Analysis of orbital configurations for geocenter determination with GPS and low-Earth orbiters Type de document : Article/Communication Auteurs : Da Kuang, Auteur ; Yoaz E. Bar-Sever, Auteur ; Bruce J. Haines, Auteur Année de publication : 2015 Article en page(s) : pp 471 - 481 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] analyse comparative [Termes IGN] antenne GPS [Termes IGN] double différence [Termes IGN] géocentre [Termes IGN] hauteur ellipsoïdale [Termes IGN] orbite basse [Termes IGN] orbitographie par GNSS [Termes IGN] poursuite de satellite [Termes IGN] récepteur GPS [Termes IGN] télémétrie laser sur satellite Résumé : (auteur) We use a series of simulated scenarios to characterize the observability of geocenter location with GPS tracking data. We examine in particular the improvement realized when a GPS receiver in low Earth orbit (LEO) augments the ground network. Various orbital configurations for the LEO are considered and the observability of geocenter location based on GPS tracking is compared to that based on satellite laser ranging (SLR). The distance between a satellite and a ground tracking-site is the primary measurement, and Earth rotation plays important role in determining the geocenter location. Compared to SLR, which directly and unambiguously measures this distance, terrestrial GPS observations provide a weaker (relative) measurement for geocenter location determination. The estimation of GPS transmitter and receiver clock errors, which is equivalent to double differencing four simultaneous range measurements, removes much of this absolute distance information. We show that when ground GPS tracking data are augmented with precise measurements from a GPS receiver onboard a LEO satellite, the sensitivity of the data to geocenter location increases by more than a factor of two for Z-component. The geometric diversity underlying the varying baselines between the LEO and ground stations promotes improved global observability, and renders the GPS technique comparable to SLR in terms of information content for geocenter location determination. We assess a variety of LEO orbital configurations, including the proposed orbit for the geodetic reference antenna in space mission concept. The results suggest that a retrograde LEO with altitude near 3,000 km is favorable for geocenter determination. Numéro de notice : A2015-347 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-015-0792-6 Date de publication en ligne : 08/02/2015 En ligne : https://doi.org/10.1007/s00190-015-0792-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76721 [article]

DORIS satellite phase center determination and consequences on the derived scale of the Terrestrial Reference Frame / Pascal Willis in Advances in space research, vol 39 n° 10 (May 2007)  

Public [article]  inAdvances in space research > vol 39 n° 10 (May 2007) . - pp 1589 - 1596 Titre : DORIS satellite phase center determination and consequences on the derived scale of the Terrestrial Reference Frame Type de document : Article/Communication Auteurs : Pascal Willis , Auteur ; Bruce J. Haines, Auteur ; Da Kuang, Auteur Année de publication : 2007 Article en page(s) : pp 1589 - 1596 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] antenne DORIS [Termes IGN] centre de phase [Termes IGN] données DORIS [Termes IGN] erreur systématique [Termes IGN] géocentre [Termes IGN] International Terrestrial Reference Frame [Termes IGN] série temporelle Résumé : (auteur) We analyzed 1 year of DORIS data to estimate daily corrections to the mean locations of the satellite antenna phase centers. For each DORIS satellite, we looked for possible biases, discontinuities, trends or annual signals. All SPOT satellites show very similar patterns, which are characterized by a significant constant bias of about 20 mm in the cross-track direction as well as a clear annual signal of 5 mm amplitude. All DORIS satellites show a consistent systematic radial offset of 10–20 mm (equivalent to 1.5–3.0 ppb in the Terrestrial Reference Frame) when using ITRF2000 and less than 1 ppb using ITRF2005P. A discontinuity unexpectedly appears in DORIS radial antenna phase center offset of the ENVISAT satellite on October 12, 2004, at the time of a flight software switch. GPS phase center offsets were also computed for Jason and TOPEX/Poseidon and no significant differences were found between DORIS and GPS estimations. Finally, we applied these estimated DORIS satellite antenna phase center offsets to derive weekly time series of station coordinates in 2004. Results showed very small improvement for station coordinates and confirmed that DORIS scale could match ITRF2000 scale by modifying the vector between the center of mass of the satellite and the phase center of the on-board antenna with a proper radial offset. At this point, we do not recommend the adoption of any empirical DORIS satellite phase center offsets at this point. Numéro de notice : A2007-665 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2007.01.007 Date de publication en ligne : 12/01/2007 En ligne : https://doi.org/10.1016/j.asr.2007.01.007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102696 [article]

Initial orbit determination results for Jason-1: Towards a 1 cm orbit / Bruce J. Haines in Navigation : journal of the Institute of navigation, vol 50 n° 3 (Fall 2003)  

Public [article]  inNavigation : journal of the Institute of navigation > vol 50 n° 3 (Fall 2003) . - pp 171 - 180 Titre : Initial orbit determination results for Jason-1: Towards a 1 cm orbit Type de document : Article/Communication Auteurs : Bruce J. Haines, Auteur ; Willy I. Bertiger, Auteur ; Shailen Desai, Auteur ; Da Kuang, Auteur ; Tim Munson, Auteur ; L. Young, Auteur ; Pascal Willis , Auteur Année de publication : 2003 Article en page(s) : pp 171 - 180 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Techniques orbitales [Termes IGN] données Jason [Termes IGN] océanographie [Termes IGN] orbitographie Résumé : (auteur) The U.S./French Jason-1 oceanographic mission is carrying state-of-the-art radiometric tracking systems (GPS and DORIS) to support precise orbit determination (POD) requirements. The performance of the systems is strongly reflected in the early POD results. Results of both internal and external (e.g., satellite laser ranging) comparisons indicate that the root-mean-square (RMS) radial accuracy is in the range of 1 –2 cm. This paper reviews the POD strategy underlying these orbits, as well as the challenging issues that bear on the understanding and characterization of an orbit solution at the 1 cm level. It also describes a GPS-based system for producing science-quality orbits in near real time to support emerging applications in operational oceanography. Numéro de notice : A2003-772 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : https://www.ion.org/publications/abstract.cfm?articleID=102353 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101212 [article]

Topex-Jason combined GPS-DORIS orbit determination in the TanDEM phase / Pascal Willis in Advances in space research, vol 31 n° 8 (14/03/2003)  

Public [article]  inAdvances in space research > vol 31 n° 8 (14/03/2003) . - pp 1941 - 1946 Titre : Topex-Jason combined GPS-DORIS orbit determination in the TanDEM phase Type de document : Article/Communication Auteurs : Pascal Willis , Auteur ; Bruce J. Haines, Auteur ; Yoaz E. Bar-Sever, Auteur ; Willy I. Bertiger, Auteur ; Ron Muellerschoen, Auteur ; Da Kuang, Auteur ; Shailen Desai, Auteur Année de publication : 2003 Article en page(s) : pp 1941 - 1946 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Techniques orbitales [Termes IGN] balise DORIS [Termes IGN] GIPSY-OASIS [Termes IGN] Jason [Termes IGN] orbite précise [Termes IGN] orbitographie [Termes IGN] récepteur DORIS [Termes IGN] récepteur GPS [Termes IGN] TOPEX-Poseidon Résumé : (Auteur) In December 2001, the Jason-1 satellite was launched to extend the long-term success of the TOPEX/POSEIDON (T/P) oceanographic mission. The goals for the Jason-1 mission represent both a significant challenge and a rare opportunity for precise orbit determination (POD) analysts. Like its predecessor, Jason-1 carries three types of POD systems: a GPS receiver, a DORIS receiver and a laser retro-reflector. In view of the 1-cm goal for radial orbit accuracy, several major improvements have been made to the POD systems: 1) the GPS "BlackJack" TurboRogue Space Receiver (TRSR) tracks up to 12 GPS spacecraft using advanced codeless tracking techniques; 2) a newly developed DORIS receiver can track two ground beacons simultaneously with lower noise. In addition, the satellite itself features more straightforward attitude behavior, and a symmetric shape, simplifying the orbit determination models compared to T/P. On the other hand, the area-to-mass ratio for Jason-1 is larger, implying larger potential surface-force errors. This paper presents Jason-1 POD results obtained at JPL using the GIPSYOASIS II (GOA) software package. Results from standard tests (orbit overlaps, laser control points) suggest that 1 to 2 cm radial orbit precision is already being achieved using the JPL reduced-dynamic estimation approach. We also report new DORIS POD strategies that make full profit of the additional number of common DORIS observations due to the T/P-Jason-1 tandem mode of orbit as well the additional dual-channel capability of the upgraded JASON receiver (allowing simultaneous tracking of two ground stations). New information on the satellite's time scale is availed through this new estimation strategy. Results show that a significant improvement to DORIS-based orbits could be gained using this strategy. Building on these results, we have extended the GIPSY/OASIS II software capability to more fully exploit the combined benefit of both GPS and DORIS measurements from UP and Jason-1 in their preliminary tandem mode. POD test results are used to demonstrate the accuracy of these orbits and to compare results in different cases: DORIS-alone, and GPS and DORIS together in both single- and multi-satellite modes. On the other, we have demonstrated and explained an anomalous behavior of the on-board oscillator when crossing the South Atlantic Anomaly region. Finally, plans for future software enhancements, processing strategies and modeling improvements are presented. Numéro de notice : 54856 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : IMAGERIE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0273-1177(03)00156-X Date de publication en ligne : 28/10/2003 En ligne : https://doi.org/10.1016/S0273-1177(03)00156-X Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34308 [article]