| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technology capable of dealing with a determination of ground noise generated from an aircraft or the like even under a complicated noisy environment such as around an airfield. <P>SOLUTION: A microphone unit 10 is installed within an airfield, and window areas Wa-Wc are specified individually for each zone that may become a noise generation source such as a parking area 20, a taxing path 30, an engine test operation area 60 or the like. The microphone unit 10 is utilized for sound identification according to a three-axis correlation of X axis, Y axis and Z axis, thereby calculating an arrival direction vector even for ground noise. By specifying the window areas Wa-Wc from a positional relationship between an observation point P and a zone in which noise is actually generated, it can be identified from a ratio of the arrival direction vector which one of the window areas Wa-Wc the ground noise comes from. <P>COPYRIGHT: (C)2013,JPO&INPIT |
