Acoustical Imaging Via Coherent Reception of Spatially Coloured Transmission
If the transducers of an array transmit different signals simultaneously, the insonified space is “coloured” since a particular resulting signal corresponds to each direction. At the receiver’s end, classical beamforming is performed as if insonification were isotropic. Next, each formed beam output is fed into the filter matched to the signal transmitted into that particular direction; a gain in angular resolution results, which is equal to that of the product of the transmit-receive antenna patterns although no directional transmission was required.
KeywordsDelay Line Angular Resolution Directional Transmission Matched Filter Directivity Pattern
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