scholarly journals K-4 VLBI Data-Acquisition System

1997 ◽  
Vol 49 (6) ◽  
pp. 699-708 ◽  
Author(s):  
Hitoshi Kiuchi ◽  
Jun Amagai ◽  
Shin'ichi Hama ◽  
Michito Imae
Keyword(s):  
Data Acquisition ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Vlbi Data

scholarly journals The Mark IV VLBI Data-Acquisition and Correlation System

1993 ◽  
Vol 156 ◽  
pp. 151-157
Author(s):  
Alan R. Whitney
Keyword(s):  
Data Acquisition ◽  
Cost Effective ◽  
Data Acquisition System ◽  
Data Rate ◽  
Acquisition System ◽  
The Past ◽  
Vlbi Observations ◽  
Data Rates ◽  
Correlation System ◽  
Vlbi Data

Modern VLBI observations for both astronomy and geodesy continue to demand the utmost in sensitivity. Of the methods potentially available for increasing the sensitivity of continuum VLBI observations, increasing the recorded bandwidth is generally the most cost effective.Over the past two years a broadly-supported program has been underway at Haystack Observatory to increase the sensitivity of the Mark IIIA VLBI system by more than a factor of 2. The result is an upgrade to the existing Mark IIIA data-acquisition system, dubbed Mark IV, which increases the maximum data rate to 1024 Mbits/sec, more than quadrupling the maximum data-rate of the Mark IIIA.A new correlator, based on a new custom VLSI correlator chip is also being designed to support the 1 Gbit/sec data rates from the Mark IV data-acquisition-system. An international collaborative effort is being mounted to help defray the high costs of development.

scholarly journals VLBI Observations of the Gravitational-Lens Images of Q0957+561

1984 ◽  
Vol 110 ◽  
pp. 243-246
Author(s):  
M. V. Gorenstein ◽  
I. I. Shapiro ◽  
N. L. Cohen ◽  
R. J. Bonometti ◽  
E. E. Falco ◽  
...  
Keyword(s):  
Time Delay ◽  
Data Acquisition ◽  
Mass Distribution ◽  
Data Acquisition System ◽  
Gravitational Lens ◽  
Acquisition System ◽  
Vlbi Observations ◽  
Vlbi Data ◽  
Cosmological Constants

We have conducted a series of VLBI observations of the gravitational-lens images of the quasar Q0957+561 (Walsh et al., 1979), utilizing the Mark III VLBI data acquisition system (Rogers et al., 1983). The goals of our observations are to (1) map the milliarcsecond structure of the A and B images, (2) detect the predicted third image of the quasar, and (3) determine the time delay between the images. We will use these results to constrain the mass distribution of the lens and, possibly, cosmological constants.

Design of supervisory control and data acquisition system based on GIS technology

2013 ◽  
Vol 33 (2) ◽  
pp. 567-570
Author(s):  
Zeping YANG ◽  
Deqiang LIU ◽  
Qian WANG ◽  
Qiangming XIANG
Keyword(s):  
Data Acquisition ◽  
Supervisory Control ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Gis Technology
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