Astrophysical Results from Geodetic VLBI Campaigns
نویسندگان
چکیده
منابع مشابه
Instrumental errors of geodetic VLBI
A model of VLBI observables includes eeects of geometry, environment of signal propagation and delays in the data acquisition system itself. Imperfection of the model of instrumental eeects can be a considerable source of errors in the estimates of the targeted parameters. Two eeects: spurious signals in phase calibration and instrumental polarization are considered in details. Methods of their...
متن کاملGeodetic Very Long Baseline Interferometry (VLBI) :
A brief Note compiled by: Prof. Madhav N. Kulkarni, IIT Bombay Since the inception of the Very Long Baseline Interferometry (VLBI) system in 1967, this radio interferometry technique has revolutionised the fields of geodesy, geodynamics and astrometry. With the unprecedented precision and resolution made possible by VLBI various tasks such as geodetic positioning, reference frames interconnect...
متن کاملAnalysis strategies and software for geodetic VLBI
This article describes currently used analysis strategy and data analysis software for geodetic VLBI. Today’s geodetic observing strategies are shortly presented, and the geodetic VLBI observables and data modeling are briefly discussed. A short overview is given on existing geodetic VLBI software packages and the statistical approaches that are applied. Necessary improvements of today’s analys...
متن کاملInitial Results Obtained with the First TWIN VLBI Radio Telescope at the Geodetic Observatory Wettzell
Geodetic Very Long Baseline Interferometry (VLBI) uses radio telescopes as sensor networks to determine Earth orientation parameters and baseline vectors between the telescopes. The TWIN Telescope Wettzell 1 (TTW1), the first of the new 13.2 m diameter telescope pair at the Geodetic Observatory Wettzell, Germany, is currently in its commissioning phase. The technology behind this radio telescop...
متن کاملQuasar Apparent Proper Motion Observed by Geodetic VLBI Networks
In our standard geodetic VLBI solutions, we estimate the positions of quasars assuming that their positions do not vary in time. However, in solutions estimating proper motion, a significant number of quasars show apparent proper motion greater than 50 μas/yr. For individual quasars, there are source structure effects that cause apparent proper motion. To examine how coherent the pattern of app...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1994
ISSN: 0074-1809
DOI: 10.1017/s0074180900176089