The Very Long Baseline Array
نویسندگان
چکیده
منابع مشابه
Precise geodesy with the Very Long Baseline Array
We report on a program of geodetic measurements between 1994 and 2007 which used the Very Long Baseline Array and up to 10 globally distributed antennas. One of the goals of this program was to monitor positions of the array at a 1 millimeter level of accuracy and to tie the VLBA into the International Terrestrial Reference Frame. We describe the analysis of these data and report several intere...
متن کاملVery Long Baseline Interferometry and the VLBAASP
Phase-referencing allows phase calibration of VLBI data. Using regular observations of a nearby calibrator source, delay, delay-rate, and phase corrections can be derived and their eeects removed from the target source visibility data. This technique allows imaging much weaker objects than is possible via fringe-tting methods. We examine the main types of phase error in VLBI observations (geome...
متن کاملVery Long Baseline Interferometry and the VLBAASP
The special problems encountered when performing spectral-line VLBI observations are discussed in this Chapter. In particular, the usefulness of Fourier transforming measured visibility data with respect to time, delay or frequency for purposes of fringe detection and calibration is clariied.
متن کاملPulsar Parallaxes at 5 Ghz with the Very Long Baseline Array
We present the first pulsar parallaxes measured with phase-referenced pulsar VLBI observations at 5 GHz. Due to the steep spectra of pulsars, previous astrometric measurements have been at lower frequencies. However, the strongest pulsars can be observed at 5 GHz, offering the benefit of lower combined ionospheric and tropospheric phase errors, which usually limit VLBI astrometric accuracy. The...
متن کاملDetermination of Angular Separation Between Spacecraft and Quasars with the Very Long Baseline Array
The interferometric technique of phase referencing was used to determine the relative angular positions of the Mars Exploration Rover B (MER-B) spacecraft with respect to angularly nearby quasars. The final cruise state of MER-B was observed in three sessions by the Very Long Baseline Array (VLBA) as part of a larger feasibility study to determine the accuracy of this technique. This article su...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1988
ISSN: 0074-1809
DOI: 10.1017/s0074180900135272