MICROPHONE ARRAY TECHNOLOGY FOR AIRCRAFT NOISE MEASUREMENTS

Presently available aircraft noise measurement systems are based on single channel omni-directional microphone technology. An important disadvantage of this approach is that these systems are equally sensitive to other noise sources as to the airplanes to be measured. Furthermore they are sensitive to turbulence noise caused by wind. In this paper new approaches for the measurement of aircraft noise are presented that are based on microphone array technology. Using array technology, extraneous noise sources and wind noise can effectively be suppressed. Results on optimization of array designs and signal processing for this application are presented that are based on array processing theory and were confirmed by realistic simulations. For the covering abstract see ITRD E107776.