Resolution enhancement of backward propagated images by wavefield orthogonalization

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Abstract
Backward propagation is a convolution‐type reconstruction algorithm designed for coherent holographic imaging which is commonly performed by frequency‐domain filtering. When the size of the receiving apertures is small, image resolution is degraded due to the uncertainty caused by the incomplete measurement of the wavefield in addition to the limitation corresponding to the narrow spatial‐frequency bandwidth. In this paper, the ambiguity of target identification is regarded as a result of nonorthogonal correlations of the wavefield signatures corresponding to distinct target locations. A resolution enhancement algorithm is presented by wavefield orthogonalization to uncorrelate the wavefield patterns to achieve resolution improvement on backward propagated images.

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