Some Highlights of Interferometry in early Radio Astronomy

Sullivan, Woodruff T.

doi:10.1017/s025292110001321x

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…Radio frequency (RF) telescopes have been used for ionospheric measurements almost from their inception. The earliest RF interferometric observations of cosmic radio sources in the 1940s revealed the impact of ionospheric structure at 200 MHz (see Sullivan, 1991 for a review). In the 1960s, observations within several very high frequency (VHF; 30–300 MHz) bands of bright “radio stars” (technically, a galaxy and a supernova remnant) were used to characterize VHF scintillations (Aarons & Allen, 1966; Aarons et al., 1967).…”

Section: Introductionmentioning

confidence: 99%

The Deployable Low‐Band Ionosphere and Transient Experiment

et al. 2021

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The Deployable Low‐Band Ionosphere and Transient Experiment (DLITE) is a four‐element interferometric radio telescope made from mostly commercial off‐the‐shelf parts to minimize costs and maximize ease of deployment. It operates in the high frequency and very high frequency (VHF) regimes, nominally in a 30–40 MHz band, but with good sensitivity (sky‐noise dominated) in the 20–80 MHz range. Its configuration is optimized to probe ionospheric structure using the so‐called “A‐Team,” exceptionally bright sources of cosmic radio emission. Methods have been developed to track the apparent positions and intensities of A‐Team sources without the need for beam forming to enable measurements of VHF scintillations as well as total electron content gradients. Time difference of arrival and frequency difference of arrival methods have been adapted for all‐sky imaging to facilitate both statistical measurements of scintillation levels and time domain astronomy. This study provides a detailed description of the system design, the analysis algorithms, and the science that can be conducted using results from two prototype DLITE systems in Maryland and New Mexico.

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Section: Introductionmentioning

confidence: 99%

The Deployable Low‐Band Ionosphere and Transient Experiment

et al. 2021

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“…Nevertheless, we would like to mention some milestones in the development of this technique. The first radio interferometer, of the so-called sea-cliff type, was constructed in [1945][1946] in Australia (Sullivan, 1991). It consisted of a single antenna, which observed a direct and reflected by the sea surface radio signal from the Sun near the horizon, and was used to study sunspots.…”

Section: Introductionmentioning

confidence: 99%

Statistical Analysis of the Results of 20 Years of Activity of the International VLBI Service for Geodesy and Astrometry

Malkin

2020

Astron. Rep.

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2019 marked the 20th anniversary of the International VLBI Service for Geodesy and Astrometry (IVS). This service is the largest and most authoritative organization that coordinates international activities in radio astrometry and VLBI sub-system of space geodesy. Currently, about 60 antennas located in many countries on all continents participate in the IVS observing programs. The IVS Data Centers have accumulated more than 18 million observations obtained during more than 17,000 sessions, including more than 10,000 Intensive sessions for rapid determination of Universal Time. The paper traces the dynamics of IVS development based on statistical processing of the array of observations collected in the IVS Data Centers for the period of 1979-2018. Various statistics by the years, stations, baselines, and radio sources are provided. The evolution of the IVS observational data and the accuracy of results obtained from processing VLBI observations is considered.

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“…Discussions by Michelson on the use of Interferometers are known to have taken place at least 30 years before [5,6]. The first use of a Radio Interferometer in astronomy is attributed to Ryle and Vonberg [7], whereby the Ryle-Vonberg receiver (Ryle and Vonberg [8]) was used (Sullivan [9]). From that time onwards, the theory and technology of interferometers have made enormous advances, so much so that today humanity is building the Square Kilometre Array (SKA) [10,11].…”

Section: The Radio Interferometermentioning

confidence: 99%

High-Performance Gridding For Radio Interferometric Image Synthesis

Muscat¹

2021

Preprint

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List of Figures 7.1 Optimal Solutions Performance results of the Column Pruner in the Interleaved and Non-Interleaved Square Grid Experiments . . . . . . 7.2 Optimal Solutions Performance results of the Column Pruner in the Non-Interleaved Rectangular Grid Experiments . . . . . . . . . . . . 7.3 Utilisation results of the Column Pruner in the Interleaved and Non-Interleaved Square Grid Experiments .

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Some Highlights of Interferometry in early Radio Astronomy

Cited by 5 publications

References 22 publications

The Deployable Low‐Band Ionosphere and Transient Experiment

The Deployable Low‐Band Ionosphere and Transient Experiment

Statistical Analysis of the Results of 20 Years of Activity of the International VLBI Service for Geodesy and Astrometry

High-Performance Gridding For Radio Interferometric Image Synthesis

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