Nonlinear influences on ocean waves observed by X-band radar
Nonlinear influences on ocean waves observed by X-band radar
复制标题
X波段雷达观测到的海浪的非线性影响
DOI：
--
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
C. Kao
中科院分区：
文献类型：
--
作者：
Li;D. Doong;Beng;L. Z. Chuang;C. Kao
本研究的目的是讨论信号非线性对X波段雷达观测的影响。应用并讨论了双谱分析估计非线性程度的方法。我们发现，从空间雷达后向散射序列的双谱分析是相似的，从水位时间序列得到的结果。此外，雷达后向散射的平均非线性程度与风速有关。本文还讨论了考虑雷达后向散射非线性效应后的波浪观测精度。从雷达数据中估计的波高误差也与非线性程度有关。为了提高测量精度，采用调制传递函数法消除非线性的影响。
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.