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Holographic Calibration of Phased Array Telescopes
- Source :
- Radio Science. 56
- Publication Year :
- 2021
- Publisher :
- American Geophysical Union (AGU), 2021.
-
Abstract
- In radio astronomy, holography is a commonly used technique to create an image of the electric field distribution in the aperture of a dish antenna. The image is used to detect imperfections in the reflector surface. Similarly, holography can be applied to phased array telescopes, in order to measure the complex gains of the receive paths of individual antennas. In this paper, a holographic technique is suggested to calibrate the digital beamformer of a phased array telescope. The effectiveness of the technique was demonstrated by applying it on data from the Engineering Development Array 2, one of the prototype stations of the low frequency component of the Square Kilometre Array. The calibration method is very quick and requires few resources. In contrast to holography for dish antennas, it works without a reference antenna. We demonstrate the utility of this technique for initial station commissioning and verification as well as for routine station calibration.<br />14 pages, 10 figures. Accepted for publication in Radio Science
- Subjects :
- Parabolic antenna
010504 meteorology & atmospheric sciences
Phased array
Aperture
Computer science
ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION
Holography
FOS: Physical sciences
Reflector (antenna)
02 engineering and technology
01 natural sciences
law.invention
Telescope
Optics
law
0202 electrical engineering, electronic engineering, information engineering
Electrical and Electronic Engineering
Instrumentation and Methods for Astrophysics (astro-ph.IM)
Computer Science::Information Theory
0105 earth and related environmental sciences
business.industry
Astrophysics::Instrumentation and Methods for Astrophysics
020206 networking & telecommunications
Condensed Matter Physics
Reference antenna
General Earth and Planetary Sciences
Astrophysics - Instrumentation and Methods for Astrophysics
business
Radio astronomy
Subjects
Details
- ISSN :
- 1944799X and 00486604
- Volume :
- 56
- Database :
- OpenAIRE
- Journal :
- Radio Science
- Accession number :
- edsair.doi.dedup.....475c74820f50e7246bcbddee40918c90
- Full Text :
- https://doi.org/10.1029/2020rs007171