WET  Vol.2 No.3 , July 2011
Effect of Changes in Sea-Surface State on Statistical Characteristics of Sea Clutter with X-Band Radar
Abstract
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.

Cite this paper
nullS. Ishii, S. Sayama and K. Mizutani, "Effect of Changes in Sea-Surface State on Statistical Characteristics of Sea Clutter with X-Band Radar," Wireless Engineering and Technology, Vol. 2 No. 3, 2011, pp. 175-183. doi: 10.4236/wet.2011.23025.
References

[1]   IMO Resolution A.817 (19), ECDIS Performance Standards, 2000.

[2]   M. Sekine: “Radar Signal Processing Techniques,” The Institute of Electronics, Information and Communication Engineers, Tokyo, Japan, 1991. (in Japanese).

[3]   M.L Skolnik: “Introduction to Radar System,” McGraw- Hill, New York, 1982.

[4]   J. Croney: “Clutter on Radar displays,” Wireless Eng., Vol. 33, 1956, pp. 83-96.

[5]   M. Sekine, T. Musha, Y. Tomita, T. Hagisawa, T. Irabu, E. Kiuchi: “On Weibull-Distributed Weather Clutter,” IEEE Trans. Aerosp. Elect. Syst., Vol. AES-15, No. 6, 1979, pp. 824-830.

[6]   M. Sekine and Y. Mao: “Weibull Radar Clutter,” Peter Peregrinus Ltd., London, 1990.

[7]   M. Sekine, T. Musha, Y. Tomita, T. Irabu: “Suppression of Weibull-Distributed Clutters Using a Cell-Averaging LOG/CFAR Receiver,” IEEE Trans. Aerosp. Elect. Syst., Vol. AES-14, No. 5, 1978, pp. 823-826.

[8]   M. Sekine, T. Musha, Y. Tomita, T. Hagisawa, T. Irabu, E. Kiuchi: “Suppression of Weibull -Distributed Weather Clutter,” IEEE International Radar Conference, 1980, pp. 294-298.

[9]   Peyton Z. Peebles, Jr.: “Radar Principles,” John Wiley and Sons Inc., New York, 1998.

[10]   Ministry of Land, Infrastructure, Transport and Tourism of Japan: “NOWPHAS; Nationwide Ocean Wave Information network for Ports and HArbourS,” 2010. http://www.mlit.go.jp/kowan/nowphas/index.html

[11]   N. L. Johnson, S. Kotz and N. Balakrishnan: “Distributions in Statistics: Continuous Univariate Distributions Vol. 1, Second Edition”, Wiley Series in Probability and Mathematical Statistics, 1994.

[12]   Shuji Sayama, Seishiro Ishii, Matsuo Sekine: “Amplitude Statistics of Sea Clutter Observed by L-band Radar,” IEEJ Trans., Fundamentals and Materials, Vol. 126, No. 6, 2006, pp. 426-429.

[13]   Y. Sakamoto, M. Ishiguro, and G. Kitagawa: “Information Statistics,” Kyoritsu Syuppan Co., Ltd., Tokyo, Japan, 1983. (in Japanese)

[14]   S. Kullback, R.A. Leibler, “On information and sufficiency”, Annals of Mathematical Statistics, Vol.22, 1953, pp.79-86.

 
 
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