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Nonlinear influences on ocean waves observed by X-band radar |
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| Authors: | Li-Chung Wu Dong-Jiing Doong Beng-Chun Lee Laurence Zsu-Hsin Chuang Chia Chuen Kao |
| Institution: | (1) Department of Hydraulic and Ocean Engineering, National Cheng Kung University, 1, Ta-Hsueh Rd., Tainan, Taiwan, ROC;(2) Department of Marine Environmental Informatics, National Taiwan Ocean University, 2, Beining Rd., Keelung, Taiwan, ROC;(3) Department of Environmental and Hazards-Resistant Design, Huafan University, Huafan Rd. Shihding Township, Taipei County, Taiwan, ROC;(4) Institute of Ocean Technology and Marine Affairs, National Cheng Kung University, 1, Ta-Hsueh Rd., Tainan, Taiwan, ROC |
| Abstract: | The purpose of this study is to discuss the influence of signal nonlinearity upon X-band radar observations. A method for estimating the degree of nonlinearity by bispectral analysis was applied and discussed. We found that bispectral analyses from spatial radar backscatter series are similar to results obtained from water level time series. In addition, the average nonlinear degree from radar backscatter is related to wind speed. The accuracy of wave observations derived by consideration of the nonlinear effect from radar backscatter was also investigated. The estimated error in wave height from the radar data is also related to the degree of nonlinearity. In order to improve accuracy, the modulation transfer function method was applied in order to eliminate the influence of nonlinearity. |
| Keywords: | Radar backscatter Nonlinearity Bispectral analysis |
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