27 November 2002 Development of radio seeing monitor using LEO satellite beacons
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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.
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Masanori Nishio, Tomonari Suzuyama, Hiroshi Kohashiguchi, Tomoyuki Miyazaki, Yoshio Sumino, Takafusa Ando, Masako Hirata, Qinghui Liu, "Development of radio seeing monitor using LEO satellite beacons", Proc. SPIE 4845, Advanced Global Communications Technologies for Astronomy II, (27 November 2002); doi: 10.1117/12.456593; https://doi.org/10.1117/12.456593


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