基于交叉極化數(shù)據(jù)的海面風(fēng)速反演研究

doi:10.3969/2016jms.0057

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基于交叉極化數(shù)據(jù)的海面風(fēng)速反演研究
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                        10.3969/2016jms.0057
                    
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基金項(xiàng)目:公益性行業(yè)（氣象）科研專項(xiàng)（GYHY201306050）

Wind speed retrieval of sea surface based on cross-polarization data

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摘要:

全極化數(shù)據(jù)可以獲取比單極化數(shù)據(jù)更多的目標(biāo)信息，研究發(fā)現(xiàn)C波段交叉極化數(shù)據(jù)同樣可用于海面風(fēng)速反演。針對RADARSAT-2 Fine Quad模式具有全極化成像的特點(diǎn)，以我國東部海域?yàn)檠芯繀^(qū)，結(jié)合同極化數(shù)據(jù)和交叉極化數(shù)據(jù)反演海面風(fēng)速模型，探究各種極化數(shù)據(jù)的最優(yōu)風(fēng)速反演方法。對于同極化數(shù)據(jù)采用地球物理模型函數(shù)（GMF）和極化率模型（PR）組合的方式進(jìn)行海面風(fēng)速反演，對交叉極化數(shù)據(jù)采用C波段交叉極化海面散射模型（C-2PO）進(jìn)行海面風(fēng)速反演，反演結(jié)果與ERA-Interim風(fēng)場數(shù)據(jù)進(jìn)行比較分析；此外，對ScanSAR模式交叉極化數(shù)據(jù)的后向散射系數(shù)與海面風(fēng)速的關(guān)系進(jìn)行探索分析。研究結(jié)果表明，RADARSAT-2 Fine Quad模式四種極化數(shù)據(jù)選用合適的模型均可反演出高精度的海面風(fēng)速，其中VH和HV極化數(shù)據(jù)的反演結(jié)果基本相同，交叉極化數(shù)據(jù)反演風(fēng)速效果好于同極化數(shù)據(jù)，同時(shí)，ScanSAR模式交叉極化數(shù)據(jù)的后向散射系數(shù)隨海面風(fēng)速的增大表現(xiàn)出一定的線性變化趨勢。全極化模式數(shù)據(jù)在海面風(fēng)速反演上表現(xiàn)出比單極化模式數(shù)據(jù)較為明顯的優(yōu)勢，將成為未來海面風(fēng)速反演的發(fā)展方向。

Abstract:

Full polarization data can get more target information than single polarization data. Research shows that C-band cross-polarization radar data can also be used to retrieve sea surface wind speed. For that RADARSAT-2 Fine Quad mode radar data can obtain full polarization SAR data, the optimal wind speed retrieval models with various polarization data have been discussed by combining with retrieval models of co-polarization and cross-polarization data in the eastern sea area of China. For the co-polarization SAR data, sea surface wind speed was retrieved by Geophysical Model Function (GMF) and Polarization Rate (PR) models while for cross-polarization SAR data, it was by C-2PO model, whose retrieved results were compared with ERA-Interim data. Furthermore, the relationship between the NRCS of ScanSAR mode cross-polarization SAR data and sea surface wind speed was also analyzed, whose result shows that the RADRASAT-2 Fine Quad model with appropriate models can all achieve high accuracy of sea surface wind speed, and the cross-polarization data shows better performance than the co-polarization data without requiring the radar incident angle and wind direction. The full polarization mode of RADARSAT-2 data shows a significant advantage over the single polarization data, and will become the development direction of sea surface wind speed inversion method in the future.

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許遐禎,韓冰,黃敬峰,李正泉,龔強(qiáng),王秀珍.基于交叉極化數(shù)據(jù)的海面風(fēng)速反演研究.氣象科學(xué),2017,37(5):629-638 XU Xiazhen, HAN Bing, HUANG Jingfeng, LI Zhengquan, GONG Qiang, WANG Xiuzhen. Wind speed retrieval of sea surface based on cross-polarization data. Journal of the Meteorological Sciences,2017,37(5):629-638

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收稿日期:2016-06-12
最后修改日期:2016-08-21
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在線發(fā)布日期: 2018-01-15
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