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SUMMARY:Post-correlation polarimetric conversion: advantages for calibrati
 on and imaging
DTSTART;VALUE=DATE-TIME:20211028T140000Z
DTEND;VALUE=DATE-TIME:20211028T141500Z
DTSTAMP;VALUE=DATE-TIME:20260307T085519Z
UID:indico-contribution-1@cern.ch
DESCRIPTION:Speakers: Dr. MARTI-VIDAL\, Ivan (University of Valencia)\, GO
 NZALEZ GARCIA\, JAVIER (IGN - Observatorio de Yebes)\nThe calibration and 
 imaging of VLBI observations in circular polarization basis is preferred\,
  since the parallactic-angle correction reduced to a simple deterministic 
 phase correction that commutes with all antenna-gain corrections. Circular
  polarization has indeed been the polarimetry basis in classical VLBI obse
 rvations. Hence\, conversion of the linear-polarization VGOS visibilities 
 into a pure circular basis allows for a direct application of legacy Geode
 sy and Astronomy algorithms to VGOS observations.\n\nHere we show how the 
 "PolConvert" algorithm can be used to derive the cross-polarization gains 
 of all VGOS antennas and use it to convert the DiFX products to circular b
 asis. We also show preliminary broad-band fringe-fitting results and image
  reconstructions obtained from EU-VGOS observations.\n\nhttps://events.mpi
 fr-bonn.mpg.de/indico/event/194/session/19/contribution/1
LOCATION:TU Wien Freihaus DC 02 030 "Jupiter"
URL:https://events.mpifr-bonn.mpg.de/indico/event/194/session/19/contribut
 ion/1
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