本文關(guān)鍵詞：降雨對(duì)SAR風(fēng)場(chǎng)反演的影響及校正　出處：《海洋學(xué)報(bào)》2017年09期 　論文類型：期刊論文

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【摘要】：合成孔徑雷達(dá)(Synthetic Aperture Radar,SAR)在風(fēng)場(chǎng)反演中發(fā)揮著重要的作用,但由于受到降雨的影響,海面風(fēng)場(chǎng)的反演精度會(huì)隨之下降。本文利用Radarsat-2SAR觀測(cè)數(shù)據(jù),準(zhǔn)同步降雨數(shù)據(jù)和再分析風(fēng)場(chǎng)資料對(duì)2014年臺(tái)風(fēng)"威馬遜"外圍風(fēng)場(chǎng)受降雨影響的情況進(jìn)行了分析,建立了雨致海表阻尼后向散射系數(shù)受降雨強(qiáng)度,入射角等因素影響的擬合模型,并對(duì)降雨引起的信號(hào)衰減,后向體散射進(jìn)行了評(píng)估。實(shí)驗(yàn)發(fā)現(xiàn)雨致海表面阻尼作用抑制風(fēng)致海面波的影響十分明顯,且降雨造成的信號(hào)衰減隨降雨強(qiáng)度和入射角的增大而增加,雨滴產(chǎn)生的后向體散射和雨致海表阻尼作用造成的后向散射系數(shù)變化隨降雨強(qiáng)度的增大而增加,隨入射角的增大而減小。實(shí)例表明本文建立的模型能夠有效改善降雨條件下SAR風(fēng)場(chǎng)的反演精度。
[Abstract]:Synthetic Aperture radar (SAR) plays an important role in wind field inversion, but it is affected by rainfall. The inversion accuracy of the sea surface wind field will decrease with it. In this paper, the Radarsat-2SAR data are used. The quasi-synchronous rainfall data and reanalysis wind field data are used to analyze the influence of rain on the wind field around Typhoon Weimason in 2014. The rainfall intensity is established for the backscattering coefficient of rain induced sea surface damping. The fitting model of incident angle and other factors are used to evaluate the signal attenuation and backward volume scattering caused by rainfall. It is found that the influence of rain induced sea surface damping on wind-induced sea surface waves is very obvious. The signal attenuation caused by rainfall increases with the increase of rainfall intensity and incidence angle, and the change of backscattering coefficient caused by raindrop backward scattering and rain-induced sea surface damping increases with the increase of rainfall intensity. The example shows that the proposed model can effectively improve the inversion accuracy of SAR wind field under rainfall conditions.
【作者單位】： 浙江大學(xué)海洋學(xué)院;國(guó)家海洋局第二海洋研究所衛(wèi)星海洋環(huán)境動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(41321004,41306191,41306192,41406203,41676167) 國(guó)家863項(xiàng)目(2013AA09A505) 中國(guó)科技部-歐洲空間局合作“龍計(jì)劃”四期項(xiàng)目(32249) 全球變化與海氣相互作用專項(xiàng)國(guó)際合作項(xiàng)目(GASI-IPOVAI-04)
【分類號(hào)】：P714.2
【正文快照】： 杭州310012)1引言海面風(fēng)場(chǎng)是海氣相互作用研究中非常重要的參數(shù),而臺(tái)風(fēng)作為天氣尺度上最為強(qiáng)烈的海氣相互作用之一,其風(fēng)場(chǎng)信息也成為最難監(jiān)測(cè)的物理量之一。傳統(tǒng)的觀測(cè)手段包括浮標(biāo)、海洋站、不定期的船舶報(bào)告等,效率低、成本高,所獲數(shù)據(jù)往往是零星分布的點(diǎn)數(shù)據(jù),在時(shí)間和空間，

本文編號(hào)：1376849