Visualization of meteorological effects on aircraft noise propagation based on GPS-synchronized multipoint measurement

摘要

JAXA is conducting a research on a path-optimization system to manage aircraft noiseexposure. Two prediction models are being developed for outdoor sound propagation. Oneis precise numerical computation, and the other is table lookup for the real-time pathoptimization using the computation results. Wide regional measurement are planned tovalidate these models, and a multipoint noise measurement system has been developedusing GPS timing systems to synchronize data obtained independently at eachmeasurement point. A series of flight tests for the system verification was conducted bymeasuring aircraft noise simultaneously in a wide area around flight paths. The GPStiming system successfully made it possible to eliminate delay time due to propagationdistance from the aircraft to receivers, and consequently meteorological influence onaircraft noise contour has been clearly visualized. In this paper, outlines of themeasurement system are introduced, and the meteorological influences on aircraft noisepropagation will be discussed based on the visualization results.