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Effect of Changes in Sea-Surface State on Statistical Characteristics of Sea Clutter with X-Band Radar

Wireless Engineering and Technology 2011年第3期2卷 175-183页

作者： Seishiro Ishii syuji sayama Koichi Mizutani Department of Communications Engineering National Defense Academy Yokosuka Japan Department of Intelligent Interaction Technology University of Tsukuba Tsukuba Japan

We have made observations of X-band radar sea clutter from the sea surface and sea-surface state in the Uraga Suido Traffic Route, which is used by ships entering and leaving Tokyo Bay, and the nearby Daini Kaiho Sea Fortress. We estimated the distributions of reflected amplitudes due to sea clutter using models that assume Weibull, Log-Weibull, Log-normal, and K-distributions. We then compared the results of estimating these distributions with sea-surface state data to investigate the effects of changes in the sea-surface state on the statistical characteristics of sea clutter. As a result, we showed that observed sub-ranges not containing a target conformed better to the Weibull distribution regardless of Significant Wave Height (SWH). Further, sub-ranges conforming to the Log-Weibull or Log-normal distribution in areas contained a target when the SWH was large, and as SWH decreases, sub-ranges conforming to a Log-normal. We also showed that for observed sub-ranges not containing a target, the shape parameter, c, of both Weibull and Log-Weibull distribution correlated with SWH. The correlation between wave period and shape parameters of Weibull and Log-Weibull distribution showed a weak correlation.

关键词： X-Band Radar Sea Clutter Significant Wave Height Weibull Distribution Log-Normal Distribution

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Measurement of Rain Attenuation in Terahertz Wave Range

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Wireless Engineering and Technology 2011年第3期2卷 119-124页

作者： Seishiro Ishii syuji sayama Toshihisa Kamei 不详

Rain attenuation at 355.2 GHz in the terahertz wave range was measured with our new 355.2 GHz measuring system under rainfall intensities up to 25 mm/hr. Rain attenuation coefficients were also calculated using four raindrop-size distributions, e Marshall-Palmer (M-P), Best, Polyakova-Shifrin (P-S) and Weibull distributions, and using a specific rain attenuation model for prediction methods recommended by ITU-R. Measurements of a terahertz wave taken at 355.2 GHz were compared with our calculations. Results showed that the propagation experiment was in very good agreement with a calculation from a specific attenuation model for use in prediction method recommended by ITU-R.

关键词： Terahertz Wave Rain Attenuation Raindrop-Size Distribution M-P Distribution Weibull Distribution ITU-R

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