Title page for etd-0613100-222920


[Back to Results | New Search]

URN etd-0613100-222920
Author Chien-Wen Chen
Author's Email Address No Public.
Statistics This thesis had been viewed 4644 times. Download 1038 times.
Department Electrical Engineering
Year 1999
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title A Study of the Tropospheric Effects on the Interference of the Terrestrial VHF/UHF Broadcasting Using PE Approach
Date of Defense 2000-06-02
Page Count 90
Keyword
  • broadcasting
  • troposphere
  • ducting
  • interference
  • effective earth radius factor
  • radio propagation
  • parabolic Equation
  • Abstract This thesis uses a method called "parabolic equation approach." 
    This method can treat both the variations of the terrain and the
    refractive index simultaneously. This method makes it possible
    to predict the radio propagation more precisely. We can discuss
    the effects of the variations of the refractive index to radio
    signal and demo effects by using parabolic equation method.
    The Effective Earth Radius Factor is 4/3 suggested by CCIR so-called
    "Standard Atmosphere Model". But we try to find more suitable K in
    the Southern Taiwan area. We adopt Parabolic Equation Propagation
    Model to simulate real situation of radio propagation in the Southern
    Taiwan area and the prediction is compared with the measurement
    obtained previously. We can get the best K in the Southern Taiwan
    area is 1.8 and 1.9. The best K is greater than the value of 4/3
    suggested by CCIR.
    Recently the government on Taiwan release more radio broadcasting
    licenses to the general public. As the number of radio stations
    increases, the interference between stations becomes more likely. 
    There have been reports about the poor quality of broadcasting from
    stations. In this paper, we will study the interference using FM
    radio stations as an example. Given the characteristics of the
    transmitting antenna including location, frequency, pattern, height
    and power, the field strength can be computed with the equivalent
    earth radius factor K as a parameter. The difference in interference
    level is obtained under the standard atmosphere (K=4/3) and a case of
    K=1.55 which has been reported to be more suitable in Taiwan. Finally
    an extreme case that a ducting exists will be studied.
    Our results can be used to find more suitable separation distances free
    from interferences between co-channel and adjacent channel stations. 
    By including a realistic tropospheric term, the more accurate field
    strength predictions can give the Spectrum Authority a better spectrum
    assignment tool. This has the potential to increase the number of
    available stations that can be made available or to reduce the
    interference stations may experience.
    Advisory Committee
  • C.W Kuo - chair
  • W.J. Ho - co-chair
  • C.P Hung - co-chair
  • R.T. Chung - co-chair
  • Ken-Huang Lin - advisor
  • Files
  • 中山大學規定之數位論文格式(pdf).pdf
  • indicate access worldwide
    Date of Submission 2000-06-13

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys