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Cross-Polarization ...
Cross-Polarization Gain Calibration of Linearly Polarized VLBI Antennas by Observations of 4C 39.25
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- Jaron, Frédéric (författare)
- Technische Universität Wien,Vienna University of Technology,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Marti-Vidal, Ivan, 1980 (författare)
- Universitat de Valencia
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- Schartner, Matthias (författare)
- Eidgenössische Technische Hochschule Zürich (ETH),Swiss Federal Institute of Technology in Zürich (ETH)
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- González García, J. (författare)
- Observatorio de Yebes (IGN),Yebes Observatory
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- Albentosa-Ruiz, E. (författare)
- Universitat de Valencia
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- Bernhart, Simone (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Böhm, J. (författare)
- Technische Universität Wien,Vienna University of Technology
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- Gruber, J. (författare)
- Technische Universität Wien,Vienna University of Technology
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Modiri, S. (författare)
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- Nothnagel, Axel (författare)
- Technische Universität Wien,Vienna University of Technology
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- Pérez-Díez, V. (författare)
- Observatorio de Yebes (IGN),Yebes Observatory,Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Savolainen, T. (författare)
- Aalto-Yliopisto,Aalto University,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Soja, B. (författare)
- Eidgenössische Technische Hochschule Zürich (ETH),Swiss Federal Institute of Technology in Zürich (ETH)
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- Varenius, Eskil, 1986 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Xu, Minghui (författare)
- Aalto-Yliopisto,Aalto University,Deutsches GeoForschungsZentrum (GFZ),German Research Centre for Geosciences (GFZ)
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Technische Universität Wien Max Planck Gesellschaft zur Förderung der Wissenschaften eV. (MPG) (creator_code:org_t)
- 2024
- 2024
- Engelska.
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Ingår i: Radio Science. - 0048-6604 .- 1944-799X. ; 59:4
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Radio telescopes with dual linearly polarized feeds regularly participate in Very Long Baseline Interferometry. One example is the VLBI Global Observing System (VGOS), which is employed for high-precision geodesy and astrometry. In order to achieve the maximum signal-to-noise ratio, the visibilities of all four polarization products are combined to Stokes I before fringe-fitting. Our aim is to improve cross-polarization bandpass calibration, which is an essential processing step in this context. Here we investigate the shapes of these station-specific quantities as a function of frequency and time. We observed the extra-galactic source 4C 39.25 for 6 hours with a VGOS network. We correlated the data with the DiFX software and analyzed the visibilities with PolConvert to determine the complex cross-bandpasses with high accuracy. Their frequency-dependent shape is to first order characterized by a group delay between the two orthogonal polarizations, in the order of several hundred picoseconds. We find that this group delay shows systematic variability in the range of a few picoseconds, but can remain stable within this range for several years, as evident from earlier sessions. On top of the linear phase-frequency relationship there are systematic deviations of several tens of degrees, which in addition are subject to smooth temporal evolution. The antenna cross-bandpasses are variable on time scales of ∼1 hr, which defines the frequency of necessary calibrator scans. The source 4C 39.25 is confirmed as an excellent cross-bandpass calibrator. Dedicated surveys are highly encouraged to search for more calibrators of similar quality.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Telekommunikation (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Telecommunications (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Cross-Polarization
- Antennas
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- ref (ämneskategori)
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- Av författaren/redakt...
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Jaron, Frédéric
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Marti-Vidal, Iva ...
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Schartner, Matth ...
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González García, ...
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Albentosa-Ruiz, ...
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Bernhart, Simone
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visa fler...
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Böhm, J.
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Gruber, J.
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Modiri, S.
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Nothnagel, Axel
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Pérez-Díez, V.
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Savolainen, T.
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Soja, B.
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Varenius, Eskil, ...
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Xu, Minghui
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visa färre...
- Om ämnet
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- TEKNIK OCH TEKNOLOGIER
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TEKNIK OCH TEKNO ...
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och Elektroteknik oc ...
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och Telekommunikatio ...
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Astronomi astrof ...
- Artiklar i publikationen
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Radio Science
- Av lärosätet
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Chalmers tekniska högskola