This paper outlines the development and implementation of an alternative beamforming processing technique known as 'multiplicative beamforming'. The technique is well suited to non-planar microphone arrays scanning a three-dimensional (3D) grid. Numerical simulations show that the technique improves 3D spatial localisation by reducing side lobe levels and removing the directional bias of the main lobe of the beamforming output. It can also be used to accurately localise dipole sound sources, which are commonly found in aeroacoustics. The technique has also been applied to experimentally obtained data measured using a non-planar array inside an open-jet anechoic wind tunnel at the University of Adelaide. The experimentally obtained results show good agreement to that of the numerically simulated results.
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