Interferometric measurement of tropospheric phase fluctuations at 86 GHz on antenna spacings of 24 M to 288 M

Details Interferometric measurement of tropospheric phase fluctuations at 86 GHz on antenna spacings of 24 M to 288 M Interferometric measurement of tropospheric phase fluctuations at 86 GHz on antenna spacings of 24 M to 288 M

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262..634o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 2, p. 634-643.

Astronomy and Astrophysics

Astrophysics

12

Atmospheric Effects, Atmospheric Turbulence, Infrared Interferometers, Troposphere, Data Structures, Phase Deviation

Scientific paper

We report measurements with the IRAM interferometer of tropospheric phase fluctuations at 86 GHz, on baselines 24-288 m. The data are used to derive phase structure function vs baseline length, Allan variance and 1D temporal phase power spectra. On average, the phase variance has a (baseline) exp 1.42 dependence, with the power law index changing between day and night. The 1D phase power spectra vary with temporal frequency f as f exp-2.1. The Fourier transform of the phase time series on a single baseline gives the approximate phase behavior on other baselines. The Allan deviations for times of 4 sec to about 1 min have an average slope of -1.0 +/- 0.2, close to the values expected from the structure function. The level of tropospheric phase fluctuations and the shape of the structure function both agree with previous centimeter wavelength results, after allowance for the different baseline lengths. Comparisons are also made with a recent statistical model of water vapor fluctuations and with Kolmogorov turbulence. From this analysis, we estimate limits to use of the IRAM interferometer at higher frequencies and longer baselines.

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