Flyover Noise Source Identification

Large arrays of microphones are laid out according to geometries designed byour specialists and connected to anetwork of data acquisition modules distributed to keep analogue cables short。

aircraft position during a flyover is measured with an onboard GPS system，and synchronization with array data is achieved through recording of an IRIG-B signal together with the array data and the GPS data on the aircraft。The Beamforming calculation is performed with a standard tracking time-domain Delay and Sum（DAS）algorithm with the capability of Diagonal Removal to suppress wind noise。

For each focus point in the moving system，FFT（fast Fourier transform）and averaging in short intervals are performed to obtain spectral noise source maps representing the aircraft positions at the middle of the intervals。

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