探地雷達(dá)波場數(shù)值模擬與成像.pdf

1、分類號UDC密級學(xué)號04210287、矽拐多Zz土軍碩士學(xué)位論文探地雷達(dá)波場數(shù)值模擬與成像學(xué)科名稱：劉亞麗電路與系統(tǒng)指導(dǎo)教師：張志禹教授西安理工大學(xué)碩士學(xué)位論文Title：NUMERICALSlMULA砷ONANDIMAGlNGOFGROUND。PE，NETRATINGRADAR(GPR)MajorCircuitandSystemName：caIiLIUSupervisor：ProfZhiyuZHANGAbstractSignature

2、：型fl＆Signature：GroundPenetratingRadar(GPR)isahigh—effectivetechniqueoftheshallowearthphysicalprobingItcanbeappliedtoengineeringprospectwidelybecauseoftheadvantagesoffastdevelopmentandconvenience，universalityantijamming，s

3、trongacclimatization，higllresolutionratioandSOon，therefore，thereisimportantsenseinresearchingthebasictheoryandappliedtechniqueofGPRThispaperdiscussedthreeaspectsofGPR，includingnumericalsimulation，migrationimagingandtheGP

4、RsignalprocessingFirstlythebasicprincipleofFiniteDifferenceTimeDomain(FDTD)isintroducedandthe2dimensionalFDTDequationisderivedfromtheMaxwell’Sequations，calculatedbysettinguptheappropriateexcitationsource，cellsize，theinte

5、rvalofspaceandtimeGeneralizedperfectlymatchedlayer(GPML)isusedtoabsorbtheoutgoingwaveinthesimulation，consideringtheundergroundmediaaregenerallylossymediaSeveralrepresentativemodelsarcsimulatedandgetcorrespondingGPRsectio

6、nalimagesSecondlytheoriginalGPRsectionsaremigratedinordertomaketherefectionpointsofGPRtracerecordsreturntotheirrealpositions，becausetheoriginalGPRsectionscommonlyshowthedistortedundergroundgeologybodystructureFrequencywa

7、venumbermigrationisaneffectiveandrelativelyeconomicalmethodduetoadoptFFLGPRsectionalimagesaftermigrationareobtainedthroughthefrequencywavenumbermigratignprocess，ithaveshowedtherealUndergroundgeologybodystructureLastlythe

8、targetreflectedwavesofGPRareusuallydisturbedbythestrongdirectwaves，SOthat，amethodbasedonKarhunen—Loeve(KL)transforminwaveletdomainisstudiedItusesthetimefrequencylocalizationcharacteristicofthewav6繭矗：二矗斌sis：2釜曲ti】蠢：ire“o～

9、r／。|占latiOnsOnthedirectwaveandtargetrefleetedsignalsinmultichannelGPRdataThemultichannelwaveletsectionsareobtainedviathewaveletdecomposeoftheGPRtracesandrealizedthedirectwaveremovingbyusingKLtransformTheexperimentalresul

10、tsoftheexperimentaldataandrealdatademonstratethatthismethodiseffectiveinthedirectwaveremovingandmakethetargetsignalsobviousKeywords：GroundPenetratingRadar(GPR)，F(xiàn)initeDifferenceTimeDomainmethod，Numericalsimulation，Migrati