Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984itap...32..113v&link_type=abstract
IEEE Transactions on Antennas and Propagation (ISSN 0018-926X), vol. AP-32, Feb. 1984, p. 113-118. NASA-supported research.
Astronomy and Astrophysics
Astronomy
2
Line Of Sight Communication, Microwave Antennas, Parabolic Antennas, Power Spectra, Radio Astronomy, Signal Measurement, Spectrum Analysis, Statistical Analysis
Scientific paper
Amplitude variations over a 12.9 km terrestrial line-of-sight path were measured simultaneously on a 1400 lambda and a 29 lambda antenna at 86.16 GHz. Clear atmosphere data from two occasions with considerably different meteorological conditions are presented. Both sets have statistical and spectral parameters in good agreement with turbulence theory. Some of the data taken after a thunderstorm front passage show a slow gain reduction of the large antenna of up to 2 dB and an increase in variance to a level above that of the small antenna. The power spectral density of these data reveals that the excess fluctuation power is in the region of the spectrum which turbulence theory predicts to be flat. It shows an approximate 1/f dependence. It is attributed to refractive bending of up to 0.025 deg. Gain reductions due to turbulence or turbulence induced angle-of-arrival variations were estimated to be negligible.
Davis Jonathan H.
Mayer C. E.
Vogel W. J.
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