Performance analysis over Conventional Frequency Domain Beamforming using asynchronous arrays

Large microphone arrays for acoustic measurements pose challenges, particularly for large structures such as wind turbines and aerospace platforms. Acoustic imaging techniques such as beamforming, require many microphones to achieve high spatial resolution and artifact-free sound maps. However, synchronizing a large number of channels imposes substantial hardware complexity. Asynchronous arrays are composed by subsets of microphones (array patches) that acquire the same sound at different times. This work assesses the performance degradation of Conventional Frequency Domain Beamforming (CFDB) when an array is obtained by merging asynchronous measurements from multiple smaller sub-arrays.