摘 要: | I.IntroductionThesynthetic-aperturefocusingacousticimagingisakindofultrasonicimagingtechniqueorigina1lydevelopedfromthesynthetic-aPertureradarsince7O,1'2].Insynthetic-apertureradar,electro-magneticwaveisusedasthesignalcarrier,whichpropagatesatveryhighvelocityandworksatveryhighfrequency.Therefore,evenwhenthesignaltakesrelativelynarrowband-widthofB.51o%,thesystemresolutionmaystillmeettherequiredspecification.Insynthetic-apertureacousticimaging,theacousticwaveisusedasthesignalcarrier,whichprop…
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