Tropospheric Delay Calibrations for VERA

Details Tropospheric Delay Calibrations for VERA Tropospheric Delay Calibrations for VERA

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pasj...60..951h&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.60, No.5, pp.951--960

Astronomy and Astrophysics

Astronomy

29

Astrometry, Techniques: High Angular Resolution, Techniques: Interferometric

Scientific paper

We present techniques for the tropospheric delay calibration, which is the key to increasing the accuracy of the phase-referencing astrometry with Very Long Baseline Interferometry (VLBI). We study three methods, and make a comparison of these methods to discuss the accuracy in calibration. Our results show that all three methods can calibrate the tropospheric zenith delay within accuracy of ˜2cm. We also present simulations of positional errors in VLBI Exploration of Radio Astrometry (VERA) at the presence of an error in the tropospheric zenith delay, showing that parallax measurements with accuracy of 10μ as can be readily achieved for sources at high declination and with small separation angles between the target Galactic maser and extragalactic position references.

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