| http://www.w3.org/ns/prov#value | - ion, wherein at least said second configuration is sparse; forming a beamsummed receive signal derived from said set of echo signals; forming a first filtered signal by 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 nf0, where n is a positive integer greater than or equal to 2; f
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