Synthetic aperture radar (SAR) imagery often requires sidelobe control, or apodization, via weighting of the frequency domain aperture. This is of particular importance when imaging scenes containing objects such as ships or buildings having very large radar cross sections. Sidelobe improvement using spectral weighting is invariably at the expense of mainlobe resolution presented here is a class of nonlinear operators which significantly reduce sidelobe levels without degrading mainlobe resolution implementation is via sequential nonlinear operations applied to complex-valued (undetected) SAR imagery. SAR imaging is used to motivate the concepts developed in this work. However, these nonlinear apodization techniques have potentially broad and far-ranging applications in antenna design, sonar, digital filtering etc., i.e., whenever data can be represented as the Fourier transform of a finite-aperture signal.
Nonlinear apodization for sidelobe control in SAR imagery
Nichtlineare Aperturwichtung zur Nebenzipfelreduktion bei SAR-Abbildungen
IEEE Transactions on Aerospace and Electronic Systems ; 31 , 1 ; 267-279
1995
13 Seiten, 7 Quellen
Aufsatz (Zeitschrift)
Englisch
Sonar , schnelle Fourier-Transformation , nichtlineares System , Nyquist-Diagramm , Rückstrahlfläche , Spektralanalyse , Gewichtung , Schiff , Radarsystem , synthetische Apertur , Auflösungsvermögen , Nebenzipfel , Spektralbereich , Digitalfilter , nichtlineare Verzerrung , Schatten , Radarüberwachung , digitale Signalverarbeitung , Frequenzbereichsanalyse , Radar mit synthetischer Apertur , Gebäude , Radarabbildung , Bildverarbeitungsanlage , Fourier-Transformation
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