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TESTING TWO DIFFERENT QDAEDALUS SYSTEMS UNDER SIMILAR CONDITIONS AT GEODETIC OBSERVATORY WETTZELL AND TECHNICAL UNIVERSITY OF MUNICH, GERMANY
Abstract
QDaedalus systems are currently used for astronomical observations to obtain astrogeodetic vertical deflections (VDs). Astronomical observations cannot be made under the same conditions as geodetic observations (e.g., GNSS), because meteorological factors (e.g., cloud cover during observation, high humidity, fog, etc.) and timing of the observations may directly affect the observed benchmarks, particularly regarding precision and accuracy determinations of the VD components observed with the QDaedalus system. For this reason, we tested Leica TCRM1101 and TDA5005 total station (TS)-based QDaedalus systems at the Geodetic Observatory Wettzell (GOW) and the Technical University of Munich (TUM) astrogeodetic control station, using the same benchmarks for each device. While 4 benchmarks at GOW were used over a 2-day period (August 11-13, 2018), the TUM control station was used over three different nights (July 19, 20 and 28, 2018). The standard deviations for TCRM1101 and TDA5005 at GOW and TUM are ~0.2" or less for both of the components. While the differences between the two systems at GOW are ~0.3" or smaller for the N-S VD components, differences for the E-W components only exceed 0.3" at one of the four benchmarks. At TUM, the differences between the two systems are smaller than 0.2" for both components. Overall, these comparisons at GOW and TUM show the results from the two systems to be in good agreement. Additionally, the TUM control station has been used to test these TSs on different nights: 9 nights (TCRM1101) and 15 nights (TDA5005). The results obtained from these measurements under similar conditions at TUM by two systems were compared with other results at TUM, and subsequently, all the results are discussed.
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References11
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