Accuracy criterion for Source Power Integration with CSM diagonal removal
P. Sijtsma (TU Delft - Aircraft Noise and Climate Effects, PSA3: Pieter Sijtsma Advanced AeroAcoustics)
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Abstract
In this paper an accuracy criterion is derived for acoustic array measurements
that are disturbed by incoherent noise, for example turbulent boundary layer noise
in a wind tunnel. The accuracy criterion is a minimum signal-to-noise ratio at
which the output of the array processing method has at least 95% likelihood of
being within 1 dB error. Array processing is done with source power integration
methods applied to cross-spectral matrices without diagonal. The integrated
results are scaled to average microphone data and can therefore be considered as
denoised array data. This paper derives the accuracy criterion for broadband noise
signals consisting of multiple plane waves and for a line source of zero coherence
length. For both cases, the validity of the criterion is confirmed with synthesized
broadband noise array data.