Results 221 to 230 of about 2,311 (257)

The radio environment for a space-based low-frequency radio astronomy instrument

2019 IEEE Aerospace Conference, 2019
Opening the last frequency window for radio astronomy in the sub - 30 MHz region includes a few challenges. First of all, at frequencies below 30 MHz the Earths ionosphere severely distorts radio waves originating from celestial sources, and it completely blocks radio waves below 10 MHz.
Bentum, Mark J., Boonstra, Albert Jan, Horlings, Wouter, van Vugt, Pieter   +3 more
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MASER: a toolbox for low frequency radio astronomy

2018
The MASER (Measuring, Analysing and Simulating Radio Emissions) project provides a comprehensive infrastructure dedicated to low frequency radio emissions (typically < 50 to 100 MHz). The four main radio sources observed in this frequency are the Earth, the Sun, Jupiter and Saturn. They are observed either from ground (down to 10 MHz) or from space.
Cecconi, Baptiste, Piker, C. W., Erard, Stéphane, Le Sidaner, Pierre, Lamy, Laurent, André, Nicolas, Griessmeier, Jean-Mathias, Bonnin, Xavier, Coffre, Andrée, Genot, Vincent, Savalle, Renaud, Louis, Corentin, Aicardi, Stéphane, Denis, Laurent, Faden, J., Mafi, J. N., Sharlow, M., Sky, J., Demleitner, M.   +18 more
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Low-frequency radio astronomy and the origin of cosmic rays

2000
One of the longest standing mysteries in physics and astronomy is the origin of cosmic rays. Space-based low-frequency radio astronomy holds the promise of providing answers to key pieces of this important puzzle. There are a number of important reasons why the study of Galactic low frequency emission will offer new insights into this 87 year-old ...
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UWB active antenna array for low frequency radio astronomy

2012 6th International Conference on Ultrawideband and Ultrashort Impulse Signals, 2012
The decameter wavelength range is of interest for radio astronomy at the present time. Construction of giant low-frequency radio telescopes has been planned and is being carried out in European Union (Low Frequency Array - LOFAR), USA (Long Wavelength Array - LWA) and in Ukraine (Giant Ukrainian Radio Telescope - GURT).
A. A. Konovalenko, I. S. Falkovich, A. A. Gridin, P. L. Tokarsky, S. N. Yerin   +4 more
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Instrumentation for space-based low frequency radio astronomy

2000
This paper will provide a general overview of the techniques that have been used to measure low frequency radio waves. It will first cover basic antenna systems and problems associated with their implementation on a spacecraft. Then a discussion of receiver types and measurable parameters will follow. Resolution and precision will be addressed.
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Algorithms for Categoric Analysis of Interference in Low Frequency Radio Astronomy

Journal of Electromagnetic Waves and Applications, 2007
A study of the various types of terrestrial electromagnetic interferences categorized in terms of frequency, flux density, radio-direction, and statistics on a regular basis is essential at the radio telescope sites for understanding the radio environment viz.
S. Joardar, A. B. Bhattacharya
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Design and Implementation of a Digital Receiver for Low Frequency Radio Astronomy

2022 4th International Conference on Artificial Intelligence and Advanced Manufacturing (AIAM), 2022
Yun Yu, Quan Guo
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Very low frequency radio astronomy from the moon

2008
Lunar development is virtually certain to occur in the next 10–20 years. Very low frequency radio astronomy observations can and should begin with the first lander. A modest yet powerful near-side array should be built if backside development will be substantially delayed. A major backside array should be constructed when technology and funding permit.
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An evolutionary sequence of low frequency radio astronomy missions

2008
A progression from simple, near-term experiments to Explorer-class dedicated missions to a large lunar faxside array is a natural way to develop the observational capabilities needed for radio astronomy at low frequencies. This continuous increase in mission capabilities and scientific return is similar to the progression of infrared and X-ray missions.
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A satellite-borne receiver for low-frequency radio astronomy

Radio and Electronic Engineer, 1968
A receiver designed to measure the galactic noise spectrum in the range from 2 to 4.5 MHz and flown in the Ariel III satellite is described. Problems arising from the use of a loop antenna with a swept receiver and the exclusion of spurious signals from terrestrial sources and other experiments in the payload are discussed. Preliminary results indicate
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