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Student Number 81243004
Author Ruey-Ming Kuong(Ƿ)
Author's Email Address No Public.
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Department Graduate Institute of Atmospheric Physics
Year 1997
Semester 2
Degree Ph.D.
Type of Document Doctoral Dissertation
Language zh-TW.Big5 Chinese
Title Meteor observation by using the Chung-Li VHF Radar, System set up and analysis
Date of Defense
Page Count 313
Keyword
  • cross-spectrum
  • Diffusion coefficient
  • Diurnal tide
  • Mesospheric wind
  • Meteor trail
  • spatial interferometer
  • Abstract Three single Yagi antennas with a short baseline distance (5m)
    was set up at the Chung-Li VHF radar site in 1993. It lets us be
    able to do the interferometer study on the meteor observations.
    The arrival angles of meteor trails can be calculated by the
    interferometer method. The phase difference between different
    receiving channels shows some phase ambiguities that should be
    carefully processed while the base-line distance is greater than
    half of the transmit wavelength. A new technique was developed
    to solve this problem successfully. The other important thing is
    to estimate the system phase bias between different receiving
    channels. A tremendous way to get the system phase bias is by
    using the Field-aligned characteristic of Es echo. While using
    the switched mode operation, The ionospheric antenna arrays
    transmit and interferometer antennas and ionospheric antenna
    arrays receive alternatively. The Es echoes can be received by
    these two antenna system simultaneously and the system phase
    bias can be estimated easily from the statistical analysis. The
    phase information deduced from the meteor trail echoes should be
    adjusted first by the system phase bias. The ambiguous problem
    must be removed and then the true arrival angle of the meteor
    trail can be found by the spatial interferometer method. The
    statistical distributions such as diurnal variation, meteor
    height and meteor duration show that the results are similar
    with that of other observers. The Am-bipolar diffusion
    coefficient can be deduced by the exponential decay property of
    the under-dense meteor trail echoes. After the height of meteor
    trail was found. There is a linear relation between the nature
    logarithm of diffusion coefficient and the true height. The
    mesospheric wind(80km to 100 km)was found and tidal phenomenal
    was described first by using meteor data collected during a long
    observation period. Those results shows that the meteor trail
    observation and data process at the Chung-Li VHF radar are very
    successful.
    Table of Content
    Reference
    Advisor
  • Yen Hsyang Chu()
  • Files No Any Full Text File.
    Date of Submission

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