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• W2558076278 abstract "VLBI satellite tracking is a popular topic in geodesy at the moment. Attributed with thepotential to solve the pending problem of inter-technique frame ties, the prospect of successprovides the impetus of ongoing research in that area.Very Long Baseline Interferometry (VLBI) is a well-probed space geodetic technique used todetermine the Celestial Reference Frame (CRF), the Terrestrial Reference Frame (TRF) and theEarth Orientation Parameters (EOP) in between. Alternatively, VLBI is generally used in spacecrafttracking. Technology in that area has been rapidly advancing in the last years. An overviewof present realizations of VLBI spacecraft tracking, including data processing on the exampleof the Japanese lunar mission SELENE is part of this work. Today’s most precise and reliablerealizations of the TRF rely on the measurements of several space geodetic techniques and thecorresponding inter-technique ties. For future improvement, and also for a rigorous determinationof the whole system of CRF-EOP-TRF, alternative methods for connecting the various spacegeodetic techniques, establishing precise frame ties, are urgently needed. A promising solution isthe use of VLBI satellite observations, either in combination with a so-called space tie realized bya dedicated satellite or by directly observing satellites of the Global Navigation Satellite Systems(GNSS) with VLBI. The study of successful realizations of VLBI tracking and identifying properapplications for practical geodetic value summarizes this work.With the goal to process real data, the Vienna VLBI Software VieVS is extended for the possibilitiesto schedule, simulate and analyze VLBI satellite observations. Some details on the correspondingdelay modeling are provided. The technique of VLBI satellite tracking is introduced,discussing some practical issues as well as the latest developments. This thesis contains a detailedsimulation study of VLBI observations to satellites, identifying adequate observing strategies forthe precise determination of antenna coordinates on Earth in the satellite’s system. For satellitesat heights between 1000 and 20000 km, adequate observation strategies are found that allowthe determination of the station coordinates at the level of a few millimeters. Therefore, theapproach of weekly solutions in chosen, meaning that one satellite is observed by either a regionalor a global antenna network during seven consecutive days. For the investigated satellitesat 2000 and 6000 km, a feasible observing interval of 1 minute is found. Assuming turbulenttropospheric conditions, in regional networks of 6-7 stations with baseline lengths between 2000and 3000 km, weekly 3D position rms between 3 and 14 mm can be expected, depending on theorbit, respectively the height, of the observed satellite, as well as on the changing geometry between the observing baselines and the target satellite. For global networks, a considerable highnumber of observing telescopes is needed, about 16-32, with expected accuracies at the samelevel as in regional networks for a higher satellite at 6000 km height and about a factor of twoworse for a very low satellite at 2000 km. In the case of VLBI observations to a satellite of theGNSS, alternative observing strategies are needed. In this thesis the combination with a classicalVLBI session observing extragalactic radio sources or the observation of a satellite constellationare introduced.The careful assessment of the presented results reveals valuable application of such observationsin the area of frame ties, strongly supporting immediate realization and ongoing researchon the topic of VLBI satellite observations." @default.
• W2558076278 created "2016-12-08" @default.
• W2558076278 creator A5073696912 @default.
• W2558076278 date "2013-01-01" @default.
• W2558076278 modified "2023-09-27" @default.
• W2558076278 title "VLBI satellite tracking for the realization of frame ties" @default.
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