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    Item type:Publication,
    Modeling and measurement of airplane flutter phenomena on TV broadcasting signal
    (2008-06-01)
    Wongkeeratikul, A.
    ;
    Supnithi, P.
    ;
    Noppanakeepong, S.
    ;
    Leelaruji, N.
    ;
    Hemmakorn, N.
    This paper presents a novel approach to model TV signal due to airplane flutter phenomena. The three components of the modeling are based on 1) Bistatic radar cross sections (RCS) of an ellipsoid, 2) 3-dimensional geometry consideration technique to calculate the distance difference between direct and reflected waves due to airplane, and 3) Ray theory, based on physical and geometrical consideration. Unlike previous works, the model takes into account of realistic parameters such flying height, distance from the airport, flying angle, altitude, aircraft body type and others. The simulation results are then compared with measurement results at 60.75 MHz and 208.75 MHz. The results have shown good agreement between simulation and measurement patterns. © 2008 IEEE.
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    The observation and simulation of the airpiane flutter on low band television broadcasting signal
    (2003-01-01)
    Wonggeeratigun, A.
    ;
    Sangonchat, P.
    ;
    Noppanakeepong, S.
    ;
    Leelaruji, N.
    ;
    Moriya, Y.
    The paper studies effect of quasi-periodic or airplane flutter pheiiomcnon on television broadcasting. Airplane flutter is a very important problem. It causes the receiving antenna to receive both direct signal by the Tx (Transmitter antenna) and reflected signa1 scattered by the airplane with phase delay. The sum of two signals results in fading, sometime coilapse and distortion of picture on TV screen. W e performed measurement and modeling this phenomenon on TV signal when the airplane flew across and the range Tx and Rx (Receiver antenna). The frequency 60.75MHz (Aural frequency of CH3) is used under tests. A single scatter multipath model is introduced. It is used to duplicate some of the measured data and show the dependence of power variation on the airplane fluttering. Tlie fluctuation of the airplane flutter phenomenon was calculated to be around 2-4dB.