the effect of sea surface slicks on the doppler spectrum width of a backscattered microwave signal海面浮油的影响多普勒频谱宽度的背散射微波信号.pdfVIP

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the effect of sea surface slicks on the doppler spectrum width of a backscattered microwave signal海面浮油的影响多普勒频谱宽度的背散射微波信号.pdf

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the effect of sea surface slicks on the doppler spectrum width of a backscattered microwave signal海面浮油的影响多普勒频谱宽度的背散射微波信号

Sensors 2008, 8, 3780-3801; DOI: 10.3390/s8063780 OPEN ACCESS sensors ISSN 1424-8220 /sensors Article The Effect of Sea Surface Slicks on the Doppler Spectrum Width of a Backscattered Microwave Signal * Vladimir Karaev , Mikhail Kanevsky and Eugeny Meshkov Institute of Applied Physics, Russian Academy of Science, 46 Ulyanov Str., Nizhny Novgorod, 603950, Russia * Author to whom correspondence should be addressed; E-mail: volody@hydro.appl.sci-nnov.ru Received: 12 March 2008; in revised form: 31 May 2008 / Accepted: 2 June 2008 / Published: 6 June 2008 Abstract: The influence of a surface-active substance (SAS) film on the Doppler spectrum width at small incidence angles is theoretically investigated for the first time for microwave radars with narrow-beam and knife-beam antenna patterns. It is shown that the requirements specified for the antenna system depend on the radar motion velocity. A narrow-beam antenna pattern should be used to detect slicks by an immobile radar, whereas radar with a knife-beam antenna pattern is needed for diagnostics from a moving platform. The study has revealed that the slick contrast in the Doppler spectrum width increases as the radar wavelength diminishes, thus it is preferable to utilize wavelengths not larger than 2 cm for solving diagnostic problems. The contrast in the Doppler spectrum width is generally weaker than that in the radar backscattering cross section