Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt........21m&link_type=abstract
Thesis (PH.D.)--IOWA STATE UNIVERSITY, 1995.Source: Dissertation Abstracts International, Volume: 56-11, Section: B, page: 6303
Astronomy and Astrophysics
Astronomy
Radioastronomy, Ionosphere
Scientific paper
The radio noise background is an area of continuing research and measurement. In many cases, the background noise becomes the primary limiting factor in a communication system's sensitivity. The issue of HF (1-30 MHz) interference from terrestrial sources is especially pertinent to space -based low-frequency radio astronomy. Radio astronomy observations in the HF portion of the electromagnetic spectrum could result in new insights into astrophysical processes. However, this particular part of the spectrum is mostly inaccessible from the ground due to the effects of the Earth's ionosphere. The objective of this research is to determine to what extent terrestrial radio sources would interfere with an Earth-orbiting interferometer. The end result is a first-order global model of ionospheric HF propagation, with inputs for the ionosphere's characteristics, source characteristics, and appropriate perturbations. The model output is a simulated spectrum of the interference with respect to the geographical subsatellite point. The development emphasis has been on reasonable first-order approximations to the global wave propagation problem, since currently, no predictive estimates exist. The model predictions indicate that it is possible to perform interferometry from Earth orbit at the desired frequencies under certain cases. However, to further develop the modeling completed here, a campaign to collect additional interference data and define the necessary technical characteristics of an Earth-orbiting interferometer is strongly recommended.
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