期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 60, 期 5, 页码 951-960出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/60.5.951
关键词
astrometry; techniques: high angular resolution; techniques: interferometric
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 similar to 2 cm. 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 10 mu 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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