本文選題：海浪斜率 + UAVSAR　； 參考：《中國海洋大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年12期

【摘要】：利用L波段Uninhabited Aerial Vehicle Synthetic Aperture Radar(UAVSAR)全極化數(shù)據(jù),對成像海域海浪斜率的反演進(jìn)行了研究。其中,沿SAR圖像方位向海浪斜率是通過Krogager分解右旋和左旋圓極化相位差方程所提取的極化方向角,并利用該極化方向角的偏移量進(jìn)行求解。而在求解海浪沿距離向的斜率的過程中,本文則選取了平均散射角(α角)、一致性參數(shù)、極化相干矩陣對角元素T22/T11、同極化比四種極化特征參數(shù),并基于Bragg共振散射模型,對這四種極化特征參數(shù)的近似表達(dá)式進(jìn)行了理論推導(dǎo),通過分析發(fā)現(xiàn)這四種極化參數(shù)都是入射角的單調(diào)函數(shù),從而使得利用這四種極化參數(shù)擬合求解距離向海浪斜率成為可能。本文中選取37景UAVSAR海浪圖像,采用極化方向角及其他四種極化參數(shù)分別對海浪方位向和距離向斜率進(jìn)行了擬合反演,并通過反演所得海浪斜率譜進(jìn)一步計(jì)算出感興趣海域海浪的波長、周期、傳播方向、斜率均方根、有效波高等參數(shù),將所得結(jié)果與National Data Buoy Center(NDBC)提供的浮標(biāo)數(shù)據(jù)進(jìn)行了對比。通過對反演結(jié)果進(jìn)行統(tǒng)計(jì)分析發(fā)現(xiàn):T22/T11、一致性參數(shù)的所得結(jié)果較好,同極化比次之,α角稍差;另外,從計(jì)算的復(fù)雜程度來說,T22/T11、一致性參數(shù)、同極化比較之α角簡單,不需要復(fù)雜的極化分解。
[Abstract]:In this paper, the inversion of wave slope in the imaging sea area is studied by using L-band Uninhabited Aerial Vehicle Synthetic Aperture Radarn UAV SAR full polarization data. The wave slope along the azimuth direction of the SAR image is extracted by the Krogager decomposition of the right-handed and left-handed circular polarization phase difference equations and solved by the offset of the polarization direction angle. In the process of calculating the slope of ocean waves along the distance, the average scattering angle (偽 angle, consistency parameter, polarization coherence matrix diagonal element T22 / T11, and the same polarization ratio) are selected in this paper, and based on the Bragg resonance scattering model, four polarization characteristic parameters are selected. The approximate expressions of these four polarization characteristic parameters are theoretically deduced. It is found that the four polarization parameters are monotone functions of the incident angle, which makes it possible to use these four polarization parameters to fit and solve the distance slope of ocean waves. In this paper, 37 UAVSAR wave images are selected, and the azimuth and distance slope of ocean waves are fitted by polarization direction angle and four other polarization parameters, respectively. The wave wavelength, period, propagation direction, slope mean square root, effective wave height and other parameters are further calculated by inversion of wave slope spectrum. The results are compared with the buoy data provided by National Data Buoy Center. Through the statistical analysis of the inversion results, it is found that the consistency parameter has better results, the same polarization ratio is second, and the 偽 angle is slightly worse. In addition, in terms of the complexity of the calculation, T22 / T11, the consistency parameter, and the 偽 angle compared with the polarization are simple. There is no need for complex polarization decomposition.
【作者單位】： 中國海洋大學(xué)信息科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(41376179) 國家自然科學(xué)基金委員會-山東省人民政府聯(lián)合資助海洋科學(xué)研究中心項(xiàng)目(U1406404)~~
【分類號】：P714.1

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