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14 August 1989 Synthetic Aperture Radar: A Kelvin Wake Image Artifact
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Synthetic Aperture Radar (SAR) images of ship wakes have, under calm wind conditions, contained a "narrow vee" artifact of included angle small relative to that of the Kelvin wake envelope. Identified here is a physical source for some of these image artifacts- namely the divergent part of the Kelvin wake system. The SAR images a part of this wave subsystem via a Bragg scattering mechanism, resulting in a narrow vee artifact when the ship and SAR platform directions sufficiently agree. This artifact disappears when surface roughness is present, as with a local breeze, in conformance with observation. The predicted "down-axis" attenuation rate agrees with actual measurements from SAR imagery. A brief comparison of actual SAR images with a those of a simplified SAR simulation is discussed.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert O. Harger "Synthetic Aperture Radar: A Kelvin Wake Image Artifact", Proc. SPIE 1101, Millimeter Wave and Synthetic Aperture Radar, (14 August 1989);

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