Interferometric measurement of tropospheric phase fluctuations at 22 GHz on antenna spacings of 27 to 540 m

Details Interferometric measurement of tropospheric phase fluctuations at 22 GHz on antenna spacings of 27 to 540 m Interferometric measurement of tropospheric phase fluctuations at 22 GHz on antenna spacings of 27 to 540 m

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986itap...34..797k&link_type=abstract

IEEE Transactions on Antennas and Propagation (ISSN 0018-926X), vol. AP-34, June 1986, p. 797-803.

Astronomy and Astrophysics

Astronomy

4

Antenna Arrays, Interferometry, Microwave Antennas, Microwave Attenuation, Phase Error, Troposphere, Annual Variations, Atmospheric Attenuation, Atmospheric Turbulence, Kolmogoroff Theory, Millimeter Waves, Radio Sources (Astronomy), Standard Deviation, Turbulence Models

Scientific paper

Phase fluctuations at 22 GHz introduced by tropospheric events were measured by observing cosmic compact ratio sources with the Nobeyama millimeter-wave array on antenna spacings of 27 to 540 m. The observed interferometer phases were used to derive Allan standard deviations sigma(A), of phase fluctuations. The relationship between sigma(A) and the antenna spacing, (L), can be expressed as follows: sigma(A) = L exp N + B. The exponent N derived from the observations in February approached 5/6 as expected from the Kolmogorov turbulence model, but was smaller than 5/6 when derived from May's observations. Time domain spectra of sigma(A) also imply that atmospheric structures (such as moist air, clouds, precipitation, etc.) have seasonal variations. Meteorological parameters monitored at the height of 20 m did not show good correlations to sigma(A).

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