海面散射仿真中不同波浪谱和松弛率模型选取的对比研究

王小青; 余颖; 陈永强; 朱敏慧

doi:10.3724/SP.J.1146.2008.01819

海面散射仿真中不同波浪谱和松弛率模型选取的对比研究

doi: 10.3724/SP.J.1146.2008.01819

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出版历程
- 收稿日期: 2008-12-29
- 修回日期: 2009-10-09
- 刊出日期: 2010-02-19

The Selection of the Spectrum and Relax Rate Model in the Ocean Backscatter Simulation

摘要

摘要: 海面微波散射仿真对于实孔径、合成孔径雷达海洋遥感应用研究以及海洋监测雷达系统设计和信号处理都有很重要的意义，目前的海面散射仿真方法主要是基于复合表面模型来进行的，这些仿真方法都要用到海浪谱和松弛率模型。由于海浪谱、松弛率尤其是小尺度部分难以精确测量，不同的实验和拟合方法得到的模型有较大的差别，从而导致仿真海面散射结果往往相差较大，常常让人不知如何选取。该文比较了几种典型的海浪谱和松弛率模型的海面散射仿真结果与实测数据的差异，结果表明Romeiser提出的波浪谱在L-Ku波段，2-20 m/s风速范围内较其他波浪谱更好。而两种主要的松弛率模型的仿真结果差异不大。该结果可作为海面散射仿真中选取波浪谱和松弛率模型的参考。
- 海面散射; 波浪谱; 松弛率
Abstract: The ocean backscatter simulation is an important work for the ocean radar remote sensing application research and the design of the radar system for the ocean surveillance. Most of the ocean backscatter simulation models are based on the composite surface model, which involves the ocean wave spectrum and relax rate model. The numerous ocean spectrum and relax rate models are quite different from each other due to the different experimental and data fix methods. The different ocean spectrum and relax rate often lead to different ocean backscatter simulation results. In this paper, some typical ocean spectrum and relax rate models are used for the backscatter simulation and the results are compared with the experimental ocean scattering data. The comparison shows that the Romeiser spectrum model is better than other ocean spectrum models under the L-Ku band and 2-20m/s wind velocity, and the simulation results using different relax rate models are almost equivalent.

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Romeiser R, Alpers W, and Wismann V. An improved composite surface model for the radar backscattering cross section of the ocean surface, 1. Theory of the model and optimization / validation by scatterometer data. Journal of Geophysic Research, 1997, 102(11): 25237-25250.[2]Romeiser R and Alpers W. An improved composite surface model for the radar backscattering cross section of the ocean surface, 2. Model response to surface roughness variations and the radar imaging of underwater bottom topography. Journal of Geophysic Research C, 1997, 102(11): 25251-25267.[3]Plant W J. A stochastic, multiscale model of microwave backscatter. Journal of Geophysic Research C, 2002, 107(9): 3120.[4]余颖，王小青，朱敏慧，基于二阶散射的海面雷达后向散射模型. 电子学报，2008, 36(9): 1771-1775.[5]Yu Ying and Wang Xiao-qing, et al.. Three scale radar backscattering model of the ocean surface based on second order scattering. Acta Electronica Sinica, 2008, 36(9): 1771-1775.[6]Elfouhaily T, Chapron B, and Katsaros K, A unified directional spectrum for long and short wind-driven waves. Journal of Geophysic Research, 1997, 102(C7): 15781-15796.[7]Plant W J, Keller W C, Hesany V, and Hayes K. Measurements of the marine boundary layer from an airship[J].Journal of Atmosphere and Oceanis Technology.1998, 15(12):1433-14582.0.CO;2' target='_blank'>[8]Fung A K, Li Z, and Chen K S. Backscattering from a randomly rough dielectric surface[J].IEEE Transaction on Geoscience and Remote Sensing.1992, 30(3):356-369[9]Fung A K. Microwave Scattering and Emission Models and Their Applications, Artech House, 1994, Chapter 5.[10]Voronovich A G. Small-slope approximate for electromagic wave scattering at the rough interface of two dielectric half-space[J].Waves Random Meida.1994, 4(2):337-367[11]Chen K S and Feng A K. A backscattering model for sea surface[J].IEEE Transaction on Geoscience and Remote Sensing.1992, 30(5):811-817[12]Apel J R. An improved model of the ocean surface wave vector spectrum and its effects on radar backscatter[J].Journal of Geophysic Research.1994, 99(10):16269-16291

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