The acoustic holography/generalized inverse method of microphone array processing is improved in two ways: the linear algebra is simplified to avoid separate processing of cross spectral matrix eigenvalues, and a new regularization technique is introduced to produce reasonable results when the problem is underdetermined. Model-scale testing has shown that the improved method can map coherent sources and extrapolate directivity patterns using a modest 2D nearfield array and one data acquisition in a warehouse with no acoustic treatment. Tests with shop air jets show that rectangular jets can have asymmetric radiation patterns and the flight deck and jet blast deflector dramatically alter the radiation pattern in a configuration representing an aircraft carrier launch operation.
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