The Synthesis Radio Telescope: Principles of Operation; Evolution of Data Processing

1996 ◽  
pp. 53-74 ◽  
Author(s):  
Willem N. Brouw
Keyword(s):  
Data Processing ◽  
Radio Telescope

scholarly journals VIRAC Maser Data Processing Suite

2021 ◽  
Author(s):  
Jānis Šteinbergs ◽  
Artis Aberfelds ◽  
Marcis Bleiders ◽  
Ivar Shmeld
Keyword(s):  
Data Processing ◽  
Radio Telescope ◽  
Software Defined Radio ◽  
Observation Data ◽  
Digital Form ◽  
Software Suite ◽  
Step Process ◽  
Switching Algorithm ◽  
Single Radio ◽  
Observation Results

Modern scientific research particularly radio astronomi- cal spectroscopic observations cannot be imagined without appropriate software suite. That is necessary because of two reasons 1) data are in digital form and 2) data processing is a complex multi-step process. In this paper created in VIRAC data processing suite for a single radio telescope, space maser observations are presented. Software Defined Radio (SDR) backend data processing is described. Implementation of the frequency switching algorithm, acquisition of observation data and their format for storing are discussed. Multiple ways to display the observation results are highlighted.

scholarly journals Radio Frequency Interference Mitigation and Statistics in the Spectral Observations of FAST

2021 ◽  
Author(s):  
Chuan-Peng Zhang ◽  
Jin-Long Xu ◽  
Jie Wang ◽  
Yingjie Jing ◽  
Ziming Liu ◽  
...  
Keyword(s):  
Data Processing ◽  
Radio Frequency ◽  
Radio Telescope ◽  
Radio Astronomy ◽  
Interference Mitigation ◽  
Statistical Data ◽  
Radio Frequency Interference ◽  
Test Results ◽  
Baseline Fitting ◽  
Statistical Results

Abstract In radio astronomy, radio frequency interference (RFI) becomes more and more serious for radio observational facilities. The RFI always influences the search and study of the interesting astronomical objects. Mitigating the RFI becomes an essential procedure in any survey data processing. Five-hundred-meter Aperture Spherical radio Telescope (FAST) is an extremely sensitive radio telescope. It is necessary to find out an effective and precise RFI mitigation method for FAST data processing. In this work, we introduce a method to mitigate the RFI in FAST spectral observation and make a statistics for the RFI using ∼300 hours FAST data. The details are as follows. Firstly, according to the characteristics of FAST spectra, we propose to use the ArPLS algorithm for baseline fitting. Our test results show that it has a good performance. Secondly, we flag the RFI with four strategies, which are to flag extremely strong RFI, flag long-lasting RFI, flag polarized RFI, and flag beam-combined RFI, respectively. The test results show that all the RFI above a preset threshold could be flagged. Thirdly, we make a statistics for the probabilities of polarized XX and YY RFI in FAST observations. The statistical results could tell us which frequencies are relatively quiescent. With such statistical data, we are able to avoid using such frequencies in our spectral observations. Finally, based on the ∼300 hours FAST data, we got an RFI table, which is the most complete database currently for FAST.

Radio frequency self-interference from a data processing centre at a radio telescope site

2009 ◽  
Vol 27 (3) ◽  
pp. 121-130 ◽  
Author(s):  
Roberto Ambrosini ◽  
Pietro Bolli ◽  
Claudio Bortolotti ◽  
Francesco Gaudiomonte ◽  
Filippo Messina ◽  
...  
Keyword(s):  
Data Processing ◽  
Radio Frequency ◽  
Radio Telescope ◽  
Processing Centre

scholarly journals PSR B1259–63: Periastron Puzzles

1996 ◽  
Vol 160 ◽  
pp. 501-508
Author(s):  
Simon Johnston
Keyword(s):  
Data Processing ◽  
Radio Telescope ◽  
Major Part ◽  
Galactic Plane ◽  
New South ◽  
New South Wales ◽  
Control Room ◽  
South Wales ◽  
Phd Thesis ◽  
Large Survey

I was fortunate enough to have been involved with unravelling the secrets of PSR B1259-63 right from the start. The major part of my PhD thesis was a large survey of the southern galactic plane at an observing wavelength of 20 cm. Confirmation of a further batch of good-looking pulsar candidates from the data processing took place in November 1989 at the Parkes radio telescope in central New South Wales, Australia. My fellow student Jeremy Lim and I were in the control room when the 47.7 ms periodicity of PSR, B1259–63 was confirmed. At first, the slight increase in period from the original detection led us to believe we had discovered a ‘Crab-like’ pulsar. However by the end of the following year we realised we had something much more exciting on our hands.

scholarly journals The Study of Scattering Effects by VLBI Observations of PSR 0329+54 with HALCA at 1650 MHZ

2001 ◽  
Vol 182 ◽  
pp. 39-42
Author(s):  
A.K. Yangalov ◽  
M.V. Popov ◽  
V.A. Soglasnov ◽  
K.V. Semenkov ◽  
H. Hirabayashi ◽  
...  
Keyword(s):  
Data Processing ◽  
Radio Telescope ◽  
Radio Interferometer ◽  
Space Radio Telescope ◽  
Vlbi Observations ◽  
Scattering Effects ◽  
Initial Results

AbstractPSR0329+54 was observed at 1.6 GHz with a space-ground radio interferometer with HALCA as a space radio telescope. The initial results of data processing are discussed.

scholarly journals On-line Computing Facilities at Jodrell Bank

1971 ◽  
Vol 11 ◽  
pp. 42
Author(s):  
J. G. Davies
Keyword(s):  
Data Collection ◽  
Data Processing ◽  
Radio Telescope ◽  
Present State ◽  
Coordinate Transformation ◽  
Word Length ◽  
The Core ◽  
On Line ◽  
Effective Speed ◽  
Selection Of

An on-line computer has been in use at Jodrell Bank since 1964, both controlling the Mk II radio telescope and performing data processing functions in connection with it. However this system is now being superseded, and the following describes the present state of development, including some facilities that are only now being constructed.An Argus 400 computer is associated with each of the two main telescopes. Each has 12 000 words of core store, the word length being 24-bits, and the time for obeying most functions is 12 μs. The 24-bit word length is well suited to the application since more than 16-bit accuracy is required in the coordinate transformation. This fact, and the very versatile organization of the Argus computer, makes the effective speed relatively higher when compared with faster machines of smaller word size. In addition a drum store of about 50,000 words capacity will be fitted to each machine, and CRT and graphical output devices are available. Each machine operates a permanent program, which performs a number of functions, including in the case of the Mk II telescope the control of the instrument itself. In addition, up to three “user” programs may be operated simultaneously; these may be on-line data collection, with links to the telescope control sections, or completely off-line background jobs. A wide selection of library routine, available to all programs, is permanently in the core store, and this makes the writing of programs a relatively simple matter.

Interpretation of the Filament Depression at Millimetric and Centimetric Wavelengths

1979 ◽  
Vol 44 ◽  
pp. 131-134
Author(s):  
A. Raoult ◽  
P. Lantos ◽  
E. Fürst
Keyword(s):  
Radio Telescope ◽  
Active Regions ◽  
Simple Shape ◽  
Quiet Sun ◽  
Unstable Process

The depressions at centimetric and millimetric wavelengths associated with the filaments are studied using already published maps as well as unpublished observations from the Effelsberg 100 m radio telescope of the M.P.I., Bonn. The study has been restricted to large Ha quiescent prominences of relatively simple shape, situated far from the limb and from active regions. The data has been reduced employing one method whose main characteristics are choice of a local quiet sun definition and avoidance of the unstable process of deconvolution.

The Karolinska Hospital Information System

1974 ◽  
Vol 13 (03) ◽  
pp. 125-140 ◽  
Author(s):  
Ch. Mellner ◽  
H. Selajstder ◽  
J. Wolodakski
Keyword(s):  
Information System ◽  
Data Processing ◽  
Data Base ◽  
Hospital Information System ◽  
Care Delivery ◽  
Traditional Approach ◽  
Processing System ◽  
Systems Design ◽  
Data Processing System ◽  
Karolinska Hospital

The paper gives a report on the Karolinska Hospital Information System in three parts.In part I, the information problems in health care delivery are discussed and the approach to systems design at the Karolinska Hospital is reported, contrasted, with the traditional approach.In part II, the data base and the data processing system, named T1—J 5, are described.In part III, the applications of the data base and the data processing system are illustrated by a broad description of the contents and rise of the patient data base at the Karolinska Hospital.

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