scholarly journals Montblanc : GPU accelerated radio interferometer measurement equations in support of Bayesian inference for radio observations

2015 ◽  
Vol 12 ◽  
pp. 73-85 ◽  
Author(s):  
S.J. Perkins ◽  
P.C. Marais ◽  
J.T.L. Zwart ◽  
I. Natarajan ◽  
C. Tasse ◽  
...  
Keyword(s):  
Bayesian Inference ◽  
Radio Interferometer ◽  
Radio Observations ◽  
Measurement Equations

scholarly journals Bayesian inference for radio observations

2015 ◽  
Vol 450 (2) ◽  
pp. 1308-1319 ◽  
Author(s):  
Michelle Lochner ◽  
Iniyan Natarajan ◽  
Jonathan T. L. Zwart ◽  
Oleg Smirnov ◽  
Bruce A. Bassett ◽  
...  
Keyword(s):  
Bayesian Inference ◽  
Radio Observations

scholarly journals Circumstellar envelopes of OH-IR sources

1987 ◽  
Vol 122 ◽  
pp. 229-239 ◽  
Author(s):  
R. J. Cohen
Keyword(s):  
Radio Interferometer ◽  
Circumstellar Envelope ◽  
Radio Lines ◽  
Circumstellar Envelopes ◽  
Radio Observations ◽  
Maser Emission ◽  
Ir Sources ◽  
Consistent Picture

This article reviews recent radio observations of maser emission from OH, H2O and SiO molecules in the circumstellar envelopes of OH-IR sources. The different radio lines require different conditions for their excitation, and each therefore probes different regions in the circumstellar envelope. For some stars radio interferometer maps of several maser lines are now available, and a consistent picture of the envelope structure is beginning to emerge.

scholarly journals The Next Plan of the Nobeyama Radioheliograph

1994 ◽  
Vol 140 ◽  
pp. 430-431
Author(s):  
T. Takano ◽  
S. Enome ◽  
H. Nakajima ◽  
K. Shibasaki ◽  
M. Nishio ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Time Resolution ◽  
Solar Radio ◽  
Field Of View ◽  
High Time ◽  
Radio Interferometer ◽  
Radio Observations ◽  
Solar Observations ◽  
History Of

A high time- and spatial-resolution radio interferometer for solar observations has been constructed at Nobeyama (Figure I.; Nakajima et al. 1994). The Nobeyama Radioheliograph consists of 84 antennas, 0.8m in diameter, arranged on a T-shape lines of 500m in the EW and 220m in the NS directions. The time resolution is 50 ms and the spatial resolution is 10”. The field of view is 40’ at the observing frequency 17GHz, which enables us to watch the whole sun. The radioheliograph has observed hundreds of flares during the few months since the beginning of regular observations in July ‘92, and such powerful performance has never before been demonstrated in the history of solar radio observations.

scholarly journals Bayesian Inference for Radio Observations - Going beyond deconvolution

2014 ◽  
Vol 10 (S306) ◽  
pp. 185-188
Author(s):  
Michelle Lochner ◽  
Bruce Bassett ◽  
Martin Kunz ◽  
Iniyan Natarajan ◽  
Nadeem Oozeer ◽  
...  
Keyword(s):  
Bayesian Inference ◽  
Radio Telescope ◽  
Alternative Technique ◽  
Instrumental Effects ◽  
Missing Information ◽  
Radio Observations ◽  
Pointing Errors ◽  
Statistical Framework ◽  
Simple Simulation ◽  
Beam Parameters

AbstractRadio interferometers suffer from the problem of missing information in their data, due to the gaps between the antennae. This results in artifacts, such as bright rings around sources, in the images obtained. Multiple deconvolution algorithms have been proposed to solve this problem and produce cleaner radio images. However, these algorithms are unable to correctly estimate uncertainties in derived scientific parameters or to always include the effects of instrumental errors. We propose an alternative technique called Bayesian Inference for Radio Observations (BIRO) which uses a Bayesian statistical framework to determine the scientific parameters and instrumental errors simultaneously directly from the raw data, without making an image. We use a simple simulation of Westerbork Synthesis Radio Telescope data including pointing errors and beam parameters as instrumental effects, to demonstrate the use of BIRO.

Measurements of radio telescope receiving system noise temperatures of two-elements radio interferometer with very long baseline

2018 ◽  
pp. 51-54
Author(s):  
I. E. Arsaev ◽  
Yu. V. Vekshin ◽  
A. I. Lapshin ◽  
V. V. Mardyshkin ◽  
M. V. Sargsyan ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Radio Interferometer ◽  
System Noise ◽  
Long Baseline
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