Results 241 to 250 of about 134,290 (279)
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Journal of the Institution of Electrical Engineers, 1961
Conventional methods can no longer satisfy many observational requirements in radio astronomy. New principles are being applied in a range of instruments designed for specific purposes; some of these are discussed and contrasted in this article, which is based on a lecture given at an Ordinary Meeting at Savoy Place on the 27th October 1960.
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Conventional methods can no longer satisfy many observational requirements in radio astronomy. New principles are being applied in a range of instruments designed for specific purposes; some of these are discussed and contrasted in this article, which is based on a lecture given at an Ordinary Meeting at Savoy Place on the 27th October 1960.
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2003
Single antenna small radio telescopes, 30-m diameter and smaller, are often overshadowed by the few large dishes and multiple antennae arrays. Contemporary emphasis in radio astronomy is the construction of large antennae and multiple antennae arrays. Of course, the obvious reasons include greater flux sensitivity and improvement of spatial resolution.
J. Donald Cline +3 more
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Single antenna small radio telescopes, 30-m diameter and smaller, are often overshadowed by the few large dishes and multiple antennae arrays. Contemporary emphasis in radio astronomy is the construction of large antennae and multiple antennae arrays. Of course, the obvious reasons include greater flux sensitivity and improvement of spatial resolution.
J. Donald Cline +3 more
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Spectrometers for Radio Telescopes
1999When we decide to build a new radio telescope for observing at millimeter wavelengths of the electromagnetic spectrum, we have to make many very important decisions. One of these is the type of spectrometer to use. Here we will present a short description of the several choices available, with special focus on acousto-optical spectrometers.
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Radio-Telescope Antenna Parameters
IEEE Transactions on Military Electronics, 1964Principal antenna parameters which are useful in characterizing the electrical performance of radio-telescope antennas are defined and the relations between them are established. The application of these parameters to radio astronomical measurements is discussed.
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Incoherent clocking for radio telescopes
Ground-based and Airborne Telescopes VIII, 2020The method of “incoherent clocking” is discussed, wherein all-digital methods using FPGAs and COTS digital fiberoptic modules and commercial (e.g. aerial) fiber routing, along with free-running local oscillators at each antenna, are used to provide a clock and timing solution for “at antenna” digitization for any cost, scale, and frequency of radio ...
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The Design of Radio Telescopes
IETE Journal of Research, 1966(1966). The Design of Radio Telescopes. IETE Journal of Research: Vol. 12, No. 4, pp. 146-157.
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Radio and Submillimeter Astronomy: Radio Telescopes
2016Radio astronomy, the first astronomy after the optical one, investigates the radio emission of celestial sources. This chapter discusses the receiver systems based on the superheterodyne technique, investigating the different components: antennas, amplifiers, mixers, and detectors. The faintness of the radio signals demands radio telescope systems with
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Antennas in Radio Telescope Systems
2015Radio astronomy is the study of the universe by measurement of radio frequency emission at frequencies ranging from a few MHz to the far infrared. Signals of interest are typically extraordinarily weak, necessitating large effective aperture and resulting in some of the world’s largest antenna systems.
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New Radio Beam-Based Access to Unlicensed Spectrum: Design Challenges and Solutions
IEEE Communications Surveys and Tutorials, 2020Lorenza Giupponi +2 more
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