InSAR系列讲座3InSAR基本原理

InSAR3InSAR刘国祥(西南交通大学测量工程系,四川成都,610031)[]InSAR,InSAR[];;;[]P237[]A[]1001-8379(2004)04-0187-04BasicPrinciplesofSyntheticApertureRadarInterferometryLIUGuo-xiang(Dept.ofSurveyingEngineering,SouthwestJiaotongUniversity,Chengdu610031,China)Abstract:Asthethirdpartofthetutorial,thepaperwillintroducetheinterferometricphasesignatureandthebasicprinciplesofsyntheticapertureradarinterferometry(InSAR)whenappliedtomeasuretopographyandgrounddeformation.Thesensitiv-itiesofInSARtotopographyanddisplacementhavealsobeencomparedanddiscussed.Keywords:InSAR;basicprinciples;mathematicalmodels;sensitivities1,InSARThomasYoung1801/0,,,,/0InSAR,SAR,(),(Interferogram)()[1]InSAR()[2-9],2/SAR,[3],IF(r,a)=M(r,a)#S(r,a)*(1)1InSAR,(r,a),MSSAR,IF()1,,m=71-72(2),(1),,7172R1R2,GPS,,[4]187274200412,m[5-8]m=e+t+d+a+n(3),etd,,a[9],nC,(N),C=2Ni=1Mi#S*i2Ni=1Mi#M*i2Ni=1Si#S*i(4)C(I[0,1]),[6]2()()(1)(4)2,,,,,,3InSAR3InSARSAR,,B,a,,(),3,[4],,~1,,,3InSAR4totalunwm4(,3,),P,A1PA2Ptotal,DR,DR=R1-R2=KP#2P#total(5),K,R1R2;,P=1,,P=2BR1,BR1(),DRUB+=Bsin(H+a)(6),H,(5)(6),H=sin-1K#totalP#2PB-a(7)H,:h=H-R1cosH(8),H,BaH,R1SAR188274200412,(1),,(Phaseunwrapping),total,InSAR,4InSARmunw(unw=2Pkunw)total,total=m+2Pkunw+2Pk0(9),2Pk0,[4]4InSAR,InSAR,InSAR,,,,,[1]:#,/0#,,),/0#,/0,/0/0,,/0,)5a/0//0,5b/0,(:(10a)(11a)(12a)/0//0,(10b)(11b)(12b)(13)/0):d=m-e-t(10a)d=m2-e2-t2(10b)e=4PKB0+(11a)e2=4PKB0+2(11b)t=4PKB0LhR1sinH0(12a)t2=B0L2B0L1t1(12b)t1=m1-e1=m1-4PKB0+1(13),B0+*B0L*(),H0,K,R*,h5:(a)//0,(b)/0189274200412abs,vRvR=K4P#abs(14)5InSAR(5)(6)(7)(8)h=K2PP#R1sinHBL(15),BL=Bcos(H+a),BR1(,5a),2PKR1sinH/(PBL),/0,InSAR,,(15),,,,,InSAR,,ERS-1/2CSAR,~200(14),2P()K/2,ERSC(516cm),218cm(10)~(13),,,(1),,,InSAR,,InSAR,100ERS,1415b,ERS40b,,,1127b,In-SAR,,In-SAR[1],,,.)[J].,2000.[2],,,.InSARDEM[J].,2000,(4).[3],,,.SAR[J].,2001.[4],,,.InSARDEM[J].,2001.[5],,,.ERS:1999[J].,2002.[6]Liu,G.X.,X.L.Ding,Y.Q.Chen,Z.L.LiandZ.W.Li,SettlementfieldofChekLapKokAirport,HongKong,detectedbysatellitesyntheticapertureradarinterfer-ometry[J].ChineseScienceBulletin,Vol.46,pp.1778-1782,2001.[7]Ding,X.L.,G.X.Liu,Z.W.Li,andY.Q.Chen,GroundsubsidencemonitoringinHongKongwithsatelliteSARinterferometry[J].PhotogrammetryEngineering&Re-moteSensing,Vol.70,No.10,pp.1131-1137,2004.[8]Liu,G.X.,X.L.Ding,Z.L.Li,Z.W.Li,Y.Q.Chen,SBYu,Pre-andco-seismicgrounddeformationsofthe1999Chi-Chi,Taiwanearthquake,measuredwithSARinterferometry[J].ComputersandGeoscience,Vol.30,pp.333-343,2004.[9]Li,Z.W.,X.L.DingandG.X.Liu,Modelingatmo-sphericeffectsonInSARwithmeteorologicalandcontinuousGPSobservations:algorithmsandsometestresults[J].JournalofAtmosphericandSolar-TerrestrialPhysics,Vol.66,pp.907-917,2004.[]2004-11-03[](1968-),,,,GIS(:40374003)190274200412