Abstract
The CLEAN algorithm, originally developed in radio astronomy [Astron. Astrophys. Suppl. 15, 417–426 (1974)] for intensity images, has been modified to process complex pressure signals. The iterative method allows one to find the position and strengths of a distribution of sources which are assumed to be grouped in small regions of the sky. Recently, we have applied the CLEAN algorithm successfully to matched field processing where the ambiguity surface corresponds to an image. The original CLEAN algorithm, however, is applied only to the field intensity (magnitude). In this paper, we apply the CLEAN algorithm to the complex pressure field received by a vertical array to enhance the matched field processing. This imaging method appears to be useful when just one or a few snapshots are available so that a reliable cross-spectral density matrix cannot be obtained. Numerical simulations will be presented for the modified CLEAN algorithm that extracts a weak source masked by a stronger source.
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