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1、Along-rangeandvariablefocusphase-conjugationexperimentinshallowwaterW.S.Hodgkiss,H.C.Song,andW.A.KupermanMarinePhysicalLaboratory,ScrippsInstitutionofOceanography,UniversityofCalifornia,SanDiego,LaJolla,California92093-0701T.AkalandC.FerlaSACLANTUnderseaResearchCenter,LaSpezia,ItalyD.R.JacksonApplie
2、dPhysicsLaboratory,UniversityofWashington,Seattle,Washington98105~Received10April1998;acceptedforpublication17November1998!Asecondphase-conjugationexperimentwasconductedintheMediterraneanSeainMay1997extendingtheresultsoftheearliertime-reversalmirrorexperiment@Kupermanetal.,J.Acoust.Soc.Am.103,25±40~
3、1998!#.Newresultsreportedhereinclude~1!extendingtherangeoffocusfromtheearlierresultof6kmoutto30km,~2!verifyinganewtechniquetorefocusatrangesotherthanthatoftheprobesource@Songetal.,J.Acoust.Soc.Am.103,3234±3240~1998!#,and~3!demonstratingthatprobe-sourcepulsesupto1weekoldcanberefocusedsuccessfully.©19
4、99AcousticalSocietyofAmerica.@S0001-4966~99!02603-X#PACSnumbers:43.30.Vh,43.60.Gk,43.30.Bp,43.30.Hw@DLB#INTRODUCTIONpensateformultipathinterferenceandotherdistortionthroughacomplexmedium,itmaybeapplicabletovarious1Arecentexperiment®rstdemonstratedanacousticadaptivesonarandcommunicationconcepts.2,3ti
5、me-reversalmirror~TRM!intheocean.ATRMalsoThispaperdescribesasecondphase-conjugationexperi-referredtoastheprocessofphaseconjugationinthefre-mentconductedinMay1997.Thenewresultsreportedin4±8thispaperinclude:~1!extendingtherangeoffocusfromthequencydomain,focusessoundfromasource±receivear-ray~SRA!backto
6、theprobesource~PS!whichensoni®edearlierresultof6kmoutto30km,~2!validatinganewtheSRA.TheSRAreceivestheprobe-source®eld,timere-techniquetorefocusatrangesotherthanthatoftheprobeversesit~phaseconjugationinthefrequencydomain!,andsource,and~3!demonstratingthatprobe-sourcepulses1thenusesthetime-reverseddat
7、aastheexcitationforanarrayday,2days,andasmuchas1weekoldcanbesuccessfullyofsourceswhicharecollocatedwiththereceivinghydro-refocused.phones.Iftheoceanenvironmentdoesnotchangesigni®-cantlyduringthetwo-wa
