This paper describes the study on the measurement of the aircraft positions at near distance applying a correlation technique to the aircraft noise. The acoustic path difference between two microphones placed at an observation point is determined from the peak of the cross-correlation function of the noise signals obtained by those microphones, giving the elevation angle of the aircraft. The elevation angles at two observation points determine the cross-point of the flight path of the aircraft on the vertical plane including those two points. The noise sources of the aircraft spread widely and the position of the center of the sources located by this measuring method is considered. The effects and corrections of the weather conditions such as the temperature or wind, which affect the acoustic wave propagation, are also discussed in this paper. The results of the preriminary experiment show the possibility of the application to the practical use such as noise monitoring system.
音響的方法による航空機の位置標定
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