第二章.ConceptofSAR（合成孔径雷达概念）RadarResolution（分辨率）Rangeresolution（距离向分辨率）--Rangeresolutionisdependentonthelengthofthepulse(脉冲长度);脉冲越短，分辨率越高。Azimuthresolution（方位向分辨率）--Azimuthresolutionisdeterminedbythebeamwidth（波束宽度）；波束越短，分辨率越高.RangeResolution（距离分辨率）qDrRRSlantrangeSlantrange（斜距）（斜距）pulseoflengthlightofvelocitywhere)sin2/(qpprccRpulseoflengthlightofvelocitywhere2/pprccRRangeRange（距离）（距离）RangeResolution（距离分辨率）WhenusingpulseWhenusingpulsecompressiontechniquecompressiontechnique脉冲压缩技术脉冲压缩技术qDrRRqsin2RrBcRBR:ChirpbandwidthExample:Pulselength=0.1milli-seconds,lookangle=30oR’r=0.1x10-3x3x108/2=15kmRr=R’r/sin(30o)=30kmUsingrangecompressionmethod:m20)30sin(1055.152103sin268qRrBcRAzimuthResolution（方位分辨率）AzimuthresolutionofAzimuthresolutionofrealapertureradarrealapertureradar真实孔径雷达的方位真实孔径雷达的方位向分辨率向分辨率antennaphysicaloflengthwavelengthrangeSlantwhere/DRDRR!!km!5.4~R,10D0.056m,km,800R：ERS1/2ofExamplemqDRRSAR（合成孔径雷达）Throughthemovingofantennaalongaline,imageaThroughthemovingofantennaalongaline,imageasceneforanumberoftimessceneforanumberoftimes。。通过沿着一条直线移动天通过沿着一条直线移动天线，对同一地物多次成像线，对同一地物多次成像SynthesizethemultipleimagingdataofascenetooneSynthesizethemultipleimagingdataofascenetooneimageimage。。把同一地物的多次成像合成为一幅图像把同一地物的多次成像合成为一幅图像Equivalentto“enlarge”theantenna,formingaverylongEquivalentto“enlarge”theantenna,formingaverylongantenn