| 1. |
- Abend, Sven, et al.
(författare)
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Terrestrial very-long-baseline atom interferometry : Workshop summary
- 2024
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Ingår i: AVS Quantum Science. - : American Institute of Physics (AIP). - 2639-0213. ; 6:2
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Forskningsöversikt (refereegranskat)abstract
- This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around the world to discuss the exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter and gravitational waves. The primary objective of the workshop was to lay the groundwork for an international TVLBAI proto-collaboration. This collaboration aims to unite researchers from different institutions to strategize and secure funding for terrestrial large-scale AI projects. The ultimate goal is to create a roadmap detailing the design and technology choices for one or more kilometer--scale detectors, which will be operational in the mid-2030s. The key sections of this report present the physics case and technical challenges, together with a comprehensive overview of the discussions at the workshop together with the main conclusions.
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| 2. |
- Liu, Li, et al.
(författare)
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New Progress in VLBI tracking of GNSS satellites at GFZ
- 2014
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Ingår i: IVS 2014 General Meeting Proceedings "VGOS: The New VLBI Network", Edited by Dirk Behrend, Karen D. Baver, and Kyla L. Armstrong, Science Press (Beijing). - 9787030429742 ; , s. 456-460
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 3. |
- Tornatore, Vincenza, et al.
(författare)
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Considerations on the observation of GNSS-signals with the VLBI2010 system
- 2009
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Ingår i: Proceedings of the 19th European VLBI for Geodesy and Astrometry Working Meeting, 24-25 March 2009, Bordeaux. ; , s. 151-155
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- One interesting aspect for the de-velopment of the VLBI2010 system would beto have the possibility to observe Global Nav-igation Satellite System (GNSS) signals. Thismight allow to improve the integration and com-bination of these techniques, which is an im-portant aspect for the Global Geodetic Observ-ing System (GGOS) of the International Asso-ciation for Geodesy (IAG). We present calcula-tions for different GNSS systems and VLBI radiotelescope sensitivities to assess the expected sig-nal strength. We present L-band observations ofGNSS signals and attempts to receive GNSS sig-nals with present day S-band systems. Finally,we give a rough estimation on the expected pre-cision of the VLBI delays and the positions ofthe GNSS satellites.
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| 4. |
- Tornatore, Vincenza, et al.
(författare)
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Determination of GLONASS satellite coordinates with respect to natural radio sources using the VLBI technique: preliminary results
- 2011
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Ingår i: Proceedings of the European Test and Telemetry Conference ETTC2011, Toulouse, France.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The main objective of this manuscript is topresent tests that have been carried out using VLBI (VeryLong Baseline Interferometry) in order to evaluate if thistechnique, primarily a radio astronomical technique, canalso be used to determine positions of Earth orbitingsatellites. A number of GLONASS (Global NavigationSatellite Systems) satellites, usually used for navigationand positioning purposes, were simultaneously trackedwith two European VLBI radio telescopes in geodeticmode. Software, developed for VLBI tracking ofspacecraft, was successfully used for the processing ofthese GLONASS observations. First results are presentedand discussed.
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| 5. |
- Tornatore, Vincenza, et al.
(författare)
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Direct VLBI Observations of Global Navigation Satellite System Signals
- 2014
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Ingår i: International Association of Geodesy Symposia. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 2197-9359 .- 0939-9585. ; 139, s. 247-252
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Konferensbidrag (refereegranskat)abstract
- We describe an experiment carried out to observe signals emitted by GLONASS (GLObalNAvigation Satellite System) satellites using the Very Long Baseline Interferometry (VLBI)technique. This test was performed on a single baseline and had as its primary goal toevaluate the capability of the VLBI system to observe GNSS (Global Navigation SatelliteSystem) signals in terms of scheduling, tracking, acquisition, recording, correlation andprocessing of data.
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| 6. |
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| 7. |
- Tornatore, Vincenza, et al.
(författare)
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Single baseline GLONASS observations with VLBI: data processing and first results
- 2011
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Ingår i: Proceedings of the 20th Meeting of the European VLBI Group for Geodesy and Astrometry. - 1864-1113. ; , s. 162-165
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The VLBI technique, in geodetic mode, was used to observe signals emitted by three GLONASS (GLObal NAvigationSatellite System) satellites. The baseline observing simultaneously satellites had at its ends the Medicina (32 m) and Onsala85 (25 m) radio telescopes, both equipped with L-band receivers. Several preparatory tests were necessary for obtaining good data that could be processed. In this paper we report on the observations performed on August 16, 2010 data processing and results of the experiment. The natural radio source 3c286 was observed also as a calibrator before and after satellite observing sessions. A narrow band approach using software primarily developed for astronomical and space applications, was applied to extract the narrow band carrier. Differential frequency on the baseline Medicina-Onsala was also evaluated to compute differential phase which was then adopted to determine satellite coordinate corrections with respect to ITRFvalues. Broad-band correlation was performed on the calibrator data using the DiFX software. The SFXC correlation of satellite data was performed testing near field delay model at extreme nearness; obtained results are described.
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| 8. |
- Tornatore, Vincenza, et al.
(författare)
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Tracking of GLONASS satellites by VLBI radio telescopes
- 2010
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Ingår i: Proc. of the 5th ESA International Workshop on Tracking, Telemetry and Command Systems for Space Applications, TTC 2010, ESA-ESTEC.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Several tests to observe signals transmitted by GLONASS (GLObal NAvigation Satellite System) satellites have been performed using the VLBI (Very Long Baseline Interferometry) technique. The radio telescopes involved in these experiments are Medicina and Onsala. The satellites transmit artificial radio signals that were considered in a similar way as natural radio signal that are emitted by natural radio sources. The signal strength of satellite signals is much stronger than the signal strength of natural radio signals, so in order to avoid overload of the telescope frontends, corresponding signal attenuation was applied. Observations at the stations were performed using the standard Mark4 VLBI data acquisition rack and Mark5A disk-based recorders. The goals of the observations were to develop and test the scheduling, signal acquisition and processing routines to verify the full tracking pipeline, foreseeing the cross-correlation of the recorded data on the baseline Onsala-Medicina. The natural radio source 3C454.3 was used as a calibrator before the beginning of the satellite observation sessions.We present results of a detailed analysis of the signal recorded at the Onsala telescope together with a first attempt of cross-correlation of data recorded on the baseline Onsala–Medicina.Further plans to perform new GNSS observations are in preparation, and a study to develop the VLBI delay model for GNSS observations with astronomical VLBI telescopes is in progress.
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