Institution
European Space Operations Centre
Government•Darmstadt, Germany•
About: European Space Operations Centre is a government organization based out in Darmstadt, Germany. It is known for research contribution in the topics: Orbit determination & Satellite. The organization has 309 authors who have published 331 publications receiving 10399 citations. The organization is also known as: ESOC.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the expected variations of the radar observables over the acquisition time have been investigated, deriving a priori bounds on the possible values the observables can assume, would allow adapting the BPE settings in order to optimize the processing speed and the overall detection performance.
1 citations
01 Oct 1983
TL;DR: In this article, the Lagrange equations for the variation of parameters are formulated using respectively one of the three longitudes as fast angular variable and the first-order theory of the stroboscopic method can be developed.
Abstract: In this paper the stroboscopic method is applied to the equinoctial elements which avoid the singularities of circular and/or equatorial orbits. The Lagrange equations for the variation of parameters are formulated using respectively one of the three longitudes as fast angular variable. It is shown how the first-order theory of the stroboscopic method can be developed. The perturbation by the gravity potential of the central body and the third-body perturbation are considered in detail. The paper concludes with a few analytical results.
1 citations
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TL;DR: In this paper, a general introduction to Flight Control of Satellites is presented. But the authors mainly concentrate on the systems and operational aspects. And they point out that automatic closed loop control from ground is, for certain control functions, in particular for geostationary application satellites, a recommendable and cost effective alternative to onboard autonomous control.
1 citations
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Polytechnic University of Catalonia1, Yangtze Normal University2, Chinese Academy of Sciences3, Centre National D'Etudes Spatiales4, Wuhan University5, German Aerospace Center6, European Space Agency7, University of Warmia and Mazury in Olsztyn8, University of Bern9, European Space Operations Centre10, California Institute of Technology11, Natural Resources Canada12
TL;DR: In this article, the performance of real-time Global Ionosphere maps (RT-GIMs) was evaluated using the global total electron content (VTEC) from Jason3-altimeter during one month over oceans and dSTEC-GPS technique with 2-day observations over continental regions.
Abstract: . The Real-Time Working Group (RTWG) of the International GNSS Service (IGS) is dedicated to providing high-quality data, high-accuracy products for Global Navigation Satellite System (GNSS) positioning, navigation, timing, and Earth observations. As one part of real-time products, the IGS combined Real-Time Global Ionosphere Map (RT-GIM) has been generated by the real-time weighting of the RT-GIMs from IGS real-time ionosphere centers including the Chinese Academy of Sciences (CAS), Centre National d’Etudes Spatiales (CNES), Universitat Politecnica de Catalunya (UPC), and Wuhan University (WHU). The performance of global Vertical Total Electron Content (VTEC) representation in all of the RT-GIMs has been assessed by VTEC from Jason3-altimeter during one month over oceans and dSTEC-GPS technique with 2-day observations over continental regions. According to the Jason3-VTEC and dSTEC-GPS assessment, the real-time weighting technique is sensitive to the accuracy of RT-GIMs. Compared with the performance of post-processed rapid Global Ionosphere Maps (GIMs) and IGS combined final GIM (igsg) during the testing period, the accuracy of UPC RT-GIM (after the transition of interpolation technique) and IGS combined RT-GIM (IRTG) is equivalent to the rapid GIMs and reaches around 2.7 and 3.0 TECU (TEC Unit, 1016 el/m2) over oceans and continental regions, respectively. The accuracy of CAS RT-GIM and CNES RT-GIM is slightly worse than the rapid GIMs, while WHU RT-GIM requires a further upgrade to obtain similar performance. In addition, the strong response to the recent geomagnetic storms has been found in the Global Electron Content (GEC) of IGS RT-GIMs (especially UPC RT-GIM and IGS combined RT-GIM). The IGS RT-GIMs turn out to be reliable sources of real-time global VTEC information and have great potential for real-time applications including range error correction for transionospheric radio signals (such as GNSS positioning, search and rescue, air traffic, radar altimetry, and radioastronomy), the monitoring of space weather (such as geomagnetic and ionospheric storms, ionospheric disturbance) and detection of natural hazards on a global scale (such as hurricanes/typhoons, ionospheric anomalies associated with earthquakes). All the IGS combined RT-GIMs generated and analyzed during the testing period are available at http://doi.org/10.5281/zenodo.4651445 (Liu et al., 2021b).
1 citations
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01 Jan 1974TL;DR: In this article, the sensitivity to uncertainties of astronomical constants and geophysical parameters, i.e. luni-solar precession, nutation constant, rate of change of obliquity, polar motion and Earth rotation, is investigated.
Abstract: Inherent in Very Long Baseline Interferometry (VLBI) is the potentiality of determining relative angular positions of radio sources to an accuracy which is superior to present methods by at least one order of magnitude. For VLBI observations such as time delay, fringe frequency and fringe phase the sensitivity to the uncertainties of astronomical constants and geophysical parameters, i.e. luni-solar precession, nutation constant, rate of change of obliquity, polar motion and Earth rotation, is investigated.
1 citations
Authors
Showing all 312 results
Name | H-index | Papers | Citations |
---|---|---|---|
S. Foley | 56 | 96 | 10888 |
Anja Rudolph | 53 | 137 | 17307 |
José F. F. Mendes | 51 | 257 | 19604 |
Johannes Schmetz | 29 | 85 | 3741 |
Markus Landgraf | 28 | 86 | 2678 |
Heiner Klinkrad | 23 | 120 | 1777 |
Ian Harrison | 22 | 71 | 1664 |
Holger Krag | 19 | 107 | 1081 |
Marcus Kirsch | 16 | 43 | 715 |
R. Maarschalkerweerd | 14 | 41 | 1163 |
Nicola Policella | 14 | 64 | 865 |
Michiel Otten | 13 | 27 | 539 |
Jozef C. Van Der Ha | 12 | 46 | 368 |
R. Jehn | 12 | 37 | 387 |
Andrés Riaguas | 10 | 14 | 376 |