The observation and simulation of the airplane flutter on low band television broadcasting signal

A. Wonggeeratigun, P. Sangonchat, S. Noppanakeepong, N. Leelaruji, Y. Moriya
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引用次数: 3

Abstract

The paper studies the effect of quasi-periodic or airplane flutter phenomenon 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 signal scattered by the airplane with phase delay. The sum of two signals results in fading, sometime collapse and distortion of picture on TV screen. We performed measurement and modeling of this phenomenon on TV signal when the airplane flew across and the range Tx and Rx (receiver antenna). The 60.75 MHz frequency (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. The fluctuation of the airplane flutter phenomenon was calculated to be around 2-4 dB.
低频带电视广播信号下飞机颤振的观测与仿真
本文研究了准周期或飞机颤振现象对电视广播的影响。飞机颤振是一个非常重要的问题。它使接收天线既接收到发射机天线的直接信号,又接收到飞机散射的具有相位延迟的反射信号。两个信号的和会导致电视屏幕上的图像衰落,有时会出现崩溃和失真。我们对飞机飞过时的电视信号以及接收天线的距离Tx和Rx进行了测量和建模。试验使用60.75 MHz频率(CH3的声频)。介绍了一种单散射多径模型。利用该模型对部分实测数据进行了复制,并展示了功率变化对飞机颤振的依赖关系。计算出飞机颤振现象的波动在2-4 dB左右。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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