| http://www.w3.org/ns/prov#value | - rein at least said second configuration is sparse; means for forming a beamsummed receive signal derived from said set of echo signals; means for filtering out frequency components of said beamsummed signal not having a frequency lying within a first frequency band substantially centered at a frequency equal to nf.sub. to form a first filtered signal, where n is a positive integer greater than or
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