A machine implemented method of simulating an acoustic received signal arising from an acoustic source signal scattered by a target having {HEAD ~ a plurality} of {TAIL ~ highlights}, the method comprising the unordered steps of: 
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A machine implemented method of simulating an acoustic received signal arising from an acoustic source signal scattered by a target having { HEAD ~ a plurality } of { TAIL ~ highlights } , the method comprising the unordered steps of :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH