1996 Fiscal Year Final Research Report Summary
Fundamental Research of Phase Correction Methods in Millimeter and Sub-mm wavelengths and high-resolution imaging
| Project/Area Number |
06554002
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
Astronomy
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| Research Institution | National Astronomical Observatory |
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Principal Investigator |
ISHIGURO Masato Radio Astronomy Division National Astronomical Observatory, professor, 電波天文学研究系, 教授 (40023684)
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| Co-Investigator(Kenkyū-buntansha) |
SASAO Tetuo Earth Rotation Division National Astronomical Observatory professor, 地球回転研究系, 教授 (20000177)
CHIKADA Yoshihiro Optical and Infrared Astronomy Division National Astronomical Observatory, profe, 光学赤外線天文学研究系, 教授 (30126122)
MORITA Koichiro Radio Astronomy Division National Astronomical Observatory, assistant professor, 電波天文学研究系, 助教授 (20167688)
KAWAGUCHI Noriyuki Radio Astronomy Division National Astronomical Observatory, assistant professor, 電波天文学研究系, 助教授 (90214618)
KAWABE Ryohei Radio Astronomy Division National Astronomical Observatory, assistant professor, 電波天文学研究系, 助教授 (10195141)
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| Project Period (FY) |
1994 – 1996
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| Keywords | millimeter-and submillimeter-wave interferometer / phase correction method / high-resolution imaging / differencial radiometer / radio seeing monitor / paired antenna method / modeling of tropospheric radio transfer |
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| Research Abstract |
Several kinds of techniques were developed and actually tested for effective correction of a tropospheric phase fluctuation in millimeter-and submillimeter-wave radio interferometry, including very long baseline interferometry (VLBI) ; 1) radiometric phase correction method, 2)paired antenna method and 3)fast switching method. It was found from the experiments using the Nobeyama Millimeter Array (NMA) and a so-called radio seeing monitor that the paired antenna method and fast switching method were very effective for the phase correction at cm-wave observations. On the other hand, radiometric phase correction was found to be very usefull for the correction of the phase fluctuation in millimeter-and submillimeter-wave, by the experiments useing newly developed high-precision radiometers working at 220GHz, which are installed on the NMA.
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