Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4845..119n&link_type=abstract
Advanced Global Communications Technologies for Astronomy II. Edited by Kibrick, Robert I. Proceedings of the SPIE, Volume 4845
Astronomy and Astrophysics
Astronomy
Scientific paper
To monitor the atmospheric conditions in the radio astronomical observations, we have developed a new type of the radio seeing monitor, which enables us to measure the atmospheric turbulence in real-time and in a wide range of the direction in the celestial hemisphere. The base of the measurement system is a radio interferometer, in which the beacon waves of low earth orbit satellites (LEO satellites) for mobile communication system are received as reference signals. Time variations of the differences in arrival time are measured between element antennas of the interferometer, which are given as phase variations of cross-power spectra of the signals received by the antennas. we have made test observations of the atmospheric disturbances, and obtained a typical profile that the magnitude of the phase variations tends to increase with decreasing elevation angle of the reference source, i.e., the LEO satellite. In addition, we found that the magnitude of the phase variations is locally enhanced in some directions.
Ando Takafusa
Hirata Masako
Kohashiguchi Hiroshi
Liu Qinghui
Miyazaki Tomoyuki
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