HF Interference in Space from Terrestrial Sources

McCoy, Marisa; Basart, J. P.; Taylor, Monte

doi:10.1061/40177(207)115

Engineering, Construction, and Operations in Space V 1996

DOI: 10.1061/40177(207)115

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HF Interference in Space from Terrestrial Sources

Marisa McCoy¹,

J. P. Basart²,

Monte Taylor³

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1997

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Directions for space‐based low frequency radio astronomy: 1. System considerations

Basart¹,

Burns²,

Dennison³

et al. 1997

Radio Science

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Abstract. Although observations at the low end of the radio astronomy spectrum were the precursor of all work in radio astronomy, this portion of the spectrum has languished for decades while research at the upper radio frequencies has fluorished. Previous work at low frequencies (below 30 MHz) has clearly shown that sensitive high-resolution ground-based observations are extremely difficult to make, if not impossible. Observation quality at low frequencies can leap forward using space-based interferometers. Radio telescopes such as these can be built principally from "off-the-shelf' components. A relatively low cost space program can make great strides in deploying arrays of antennas and receivers that would produce data contributing significantly to our understanding of galaxies and galactic nebulae. This paper discusses the various aspects of low-frequency telescopes such as past history and significant issues like sensitivity, interfer-ence, baseline calibration, wave scattering, and mapping. All aspects of the first stages of space-based, low-frequency radio telescopes can be accomplished with no dependencies on new types of hardware. The time has come to open the final electromagnetic frontier in astronomy.

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Directions for space‐based low frequency radio astronomy: 1. System considerations

Basart¹,

Burns²,

Dennison³

et al. 1997

Radio Science

View full text Add to dashboard Cite

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Directions for Space‐Based Low‐Frequency Radio Astronomy: 2. Telescopes

Basart¹,

Burns²,

Dennison³

et al. 1997

Radio Science

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Abstract. Astronomical studies of celestial sources at low radio frequencies (0.3 to 30 MHz) lag far behind the investigations of celestial sources at high radio frequencies. In a companion paper [Basart et al., this issue] we discussed the need for low-frequency investigations, and in this paper we discuss the telescopes required to make the observations. Radio telescopes for use in the low-frequency range can be built principally from "off-the-shelf' components. For relatively litfie cost for a space mission, great strides can be made in deploying arrays of antennas and receivers in space that would produce data contributing significantly to our understanding of galaxies and galactic nebulae. In this paper we discuss an evolutionary sequence of telescopes, antenna systems, receivers, and (u, v) plane coverage. The telescopes are space-based because of the disruptive aspects of the Earth's ionosphere on low-frequency celestial signals traveling to the Earth's surface. Orbiting antennas consisting of array elements deposited on a Kevlar balloon have strong advantages of nearly identical multiple beams over 4n steradians and few mechanical aspects in deployment and operation. The relatively narrow beam width of these antennas can significantly help reduce the "confusion" problem. The evolutionary sequence of telescopes starts with an Earth-orbiting spectrometer to measure the low-frequency radio environment in space, proceeds to a two-element interferometer, then to an orbiting array, and ends with a telescope on the lunar farside. The sequence is in the order of increasing capability which is also the order of increasing complexity and cost. All the missions can be accomplished with current technology.

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HF Interference in Space from Terrestrial Sources

Cited by 2 publications

References 0 publications

Directions for space‐based low frequency radio astronomy: 1. System considerations

Directions for space‐based low frequency radio astronomy: 1. System considerations

Directions for Space‐Based Low‐Frequency Radio Astronomy: 2. Telescopes

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