| WANG Yunhua,LI Qun,ZHANG Yanmin. 2018. A statistical distribution of quad-pol X-band sea clutter time series acquired at a grazing angle. Acta Oceanologica Sinica, 37(3):94－102 |
| A statistical distribution of quad-pol X-band sea clutter time series acquired at a grazing angle |
| 全极化X波段雷达掠散射海面回波统计分布特征研究 |
| Received:August 29, 2017 |
| DOI：10.1007/s13131-018-1202-8 |
| Key words:sea clutter quad-pol coherent X-band radar statistical distribution function |
| 中文关键词: 雷达海杂波 全极化X波段雷达 统计分布函数 |
| 基金项目:The National Key Research and Development Program of China under contract No. 2016YFC1401008; the National Natural Science Foundation of China under contract No. 41376179; the National Natural Science Foundation of China-Shandong Joint Fund for Marine Science Research Centers under contract No. U1406404. |
| Author Name | Affiliation | E-mail | | WANG Yunhua | College of Information Science & Engineering, Ocean University of China, Qingdao 266100, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China | | | LI Qun | College of Information Science & Engineering, Ocean University of China, Qingdao 266100, China | | | ZHANG Yanmin | College of Information Science & Engineering, Ocean University of China, Qingdao 266100, China | yanminzhang@ouc.edu.cn |
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| Abstract: |
| Although the complex Wishart distribution has been widely used to analyze the statistic properties of quad-pol SAR spatial data, the applicability of this complex distribution to the time series of sea clutter is rarely discussed. The measured data of the quad-pol X-band marine radar demonstrate that the time series of the sea echoes are also satisfied the circular Gaussian distributions if the low intensity signals, which are mainly dominated by a radar noise, in the shadow regions of the large-scale waves are removed. On the basis of this fact, the probability density functions (PDFs) of the intensity as well as the phase, the real and the imaginary parts of the sea echoes obtained by the marine radar have been derived, and the theoretical models are all expressed in closed forms. In order to validate the theoretical results, the PDFs are compared with the experimental data collected by the McMaster IPIX radar. And the comparisons show that the PDF models are in good agreement with the experimental data. |
| 中文摘要: |
| 尽管复Wishart分布已被广泛应用于SAR数据统计分析，然而该分布函数却很少被用来研究雷达海面掠散射回波时间序列的统计特征。本文通过分析IPIX雷达海面掠散射回波数据发现：大尺度海浪遮挡区的雷达回波能量很低，主要是雷达系统噪声，如果将该部分低能量回波数据剔除以后，真实海面的IPIX 雷达回波时间序列数据亦满足圆高斯分布，因此，IPIX 雷达海面回波的时间序列数据也必然满足复Wishart分布。在此，我们基于Wishart分布模型分别对全极化IPIX 雷达不同极化通道数据的海面回波时间序列数据进行了统计研究，并推导给出了不同通道数据协方差矩阵元素实部、虚部及相位差等参数的统计分布函数模型。通过与雷达测量数据比计较可见，推导所得理论统计模型与实际测量数据吻合很好。本文所得结论对进一步深入理解掠散射海面雷达回波的统计特征具有一定理论意义。 |
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