合成孔径雷达概念ppt课件.ppt
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1、第二章. Concept of SAR(合成孔径雷达概念)Radar Resolution(分辨率)oRange resolution(距离向分辨率) -Range resolution is dependent on the length of the pulse(脉冲长度); 脉冲越短,分辨率越高。 oAzimuth resolution(方位向分辨率) - Azimuth resolution is determined by the beam width(波束宽度);波束越短,分辨率越高. Range Resolution(距离分辨率) Antenna Flight direction
2、Azimuth direction q D Range directionSlant range directionrRRpulse oflength light of velocity where)sin2/(qppr ccRpulse oflength light of velocity where2/ppr ccRRange Resolution (距离分辨率) Antenna Flight directionAzimuth direction q D Range directionSlant range directionrRRqsin2RrBcR BR : Chirp bandwid
3、thnExample:nPulse length = 0.1 milli-seconds, look angle = 30on Rr = 0.1 x 10-3 x 3 x 108/2 = 15 kmnRr = Rr/sin(30o) = 30 kmUsing range compression method:m 20)30sin(1055.152103sin268qRrBcRAzimuth Resolution(方位分辨率)antenna physical oflength wavelength rangeSlant where/D RDRR! !km! 5 . 4 R ,10D0.056m,
4、 km, 800R :ERS1/2 of Examplem Antenna Flight directionAzimuth direction q D Range directionSlant range directionRRSAR(合成孔径雷达)Sketch Map(示意图)(From GlobeSAR program, CCRS)12Shift towards higher frequency34Shift towards lower frequencyDecomposition of Multiple Imaging(多次成像分解示意图)舒宁 等 1997Synthesis of Mu
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