SAR图像相干斑抑制技术研究

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1、西北工业大学硕士学位论文SAR图像相干斑抑制技术研究姓名：何科峰申请学位级别：硕士专业：模式识别与智能控制指导教师：郭雷20040301西北工业大学硕士论文SAR图像相干斑抑制授术研究ABSTRACTSyntheticApertureRadarworkmakinguseofmicrowaveanditiScoherent．imagingsystem．SyntheticApertureRadarislittleaffectedbyatmosphericcondi—tions．Italsoallowsnightimaging．Soitplayesamoreandmor

2、eimportantroleinbothcivilandmilitaryareas．BecauseCOherentspeckleintheSARimagesbadlyaffectsthepost．processin·gofSARimages，whichmakessegmentation，classificationandacquisitionofan-otherinformationinSARimagescomplicated．specklereductionbecometothefirststepofSARimagespost—processing．Theres

3、earchcontentofthisdissertationisreductionofspeclenoise．T11ebasicobjectivethatthefilteringproposa】Cansolvethecontradictionbetweenspecklereductionandimageedgecharacteristiesprotection．Regardingtothealgorithmsofspecklereduction，manyalgorithmshavebeenpresentedabroadanddomestic．Forexample，

4、themulti-looksaveraging，thefilteringofspatialdomainandthefilteringoffrequencydomain．Themaincontentof血isdissertationareasfollow：l、Theauthoranalysesandderivesthestatisticscharacteristicofspeckle，includingthestatisticscharacteristicsforspeckleoftheintensityandamplitudeimagesinthespatiald

5、omain．2、nleauthoranalysesandderivesthemorefamousdespecklealgorithmandhasalreadymadeaprogramtoimplementthesealgorithmsl”3、‘Onthebaseofthetraditionalspatialfiltering．theauthorpresentanewdespecklealgorithm，thatmakeuseofitemtedprocessingandcorrelatedneighbourhoodmodel，iteratedfilteringmet

6、hodoftheSARimagecombiningthecorrelatedneighbourhoodmodelwithMaximumAPosteriorifilter，First，aseriesoftemplatesrefectingdirectioninformationareestablishedandeverytemplateiSpresentfora虹ndofneighbourstructure．ThenonthebasisofSARimagesstatisticalproperty，theMaximumAPosterioriestimateofther

7、ealintensityunderobservationimagevaluesiSgotbyBayesformulatio—n．Inthecourse，makeiteratedprocessingtogetgoodresult，KeyWords：SyntheticApertureRadar，coherent—imaging，coherentspeckle，iteratedprocessing，correlatedneighbourhoodmodel，Bayes，MaximumAPosteriorilI西北工业大学硕士论文SAR图像相干斑抑制技术研究第一章绪言1．1

8、引言雷达在