Transcription of A Principles of Synthetic Aperture Radar
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A Principles of Synthetic Aperture Radar
A Principles of Synthetic Aperture IntroductionSynthetic Aperture Radar (SAR) satellites collect swaths of side-looking echoes at a suf-ficiently high range resolution and along-track sampling rate to form high resolutionimagery (see Figure A1). As discussed in this appendix, the range resolution of theraw Radar data is determined by the pulse length (or 1/bandwidth) and theincidenceangle. For real Aperture Radar , the along-track orazimuthresolution of the outgoingmicrowave pulse is diffraction limited to an angle corresponding to the wavelength ofthe Radar ( m) divided by the length of the Aperture ( 10 m). When thisbeam pattern is projected onto the surface of the earth at a range of say 850 km, it illu-minates 4250 m in the along-track dimension so the raw Radar data are horribly out offocus in azimuth.
A.1 Introduction Synthetic aperture radar (SAR) satellites collect swaths of side-looking echoes at a suf- ... To understand why a synthetic aperture is needed for microwave remote sensing from orbital altitude one must understand the concepts of di raction and resolution. Con-
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