本文關(guān)鍵詞：降雨對SAR風場反演的影響及校正　出處：《海洋學報》2017年09期 　論文類型：期刊論文

  更多相關(guān)文章： SAR 風場反演 降雨影響 校正

【摘要】：合成孔徑雷達(Synthetic Aperture Radar,SAR)在風場反演中發(fā)揮著重要的作用,但由于受到降雨的影響,海面風場的反演精度會隨之下降。本文利用Radarsat-2SAR觀測數(shù)據(jù),準同步降雨數(shù)據(jù)和再分析風場資料對2014年臺風"威馬遜"外圍風場受降雨影響的情況進行了分析,建立了雨致海表阻尼后向散射系數(shù)受降雨強度,入射角等因素影響的擬合模型,并對降雨引起的信號衰減,后向體散射進行了評估。實驗發(fā)現(xiàn)雨致海表面阻尼作用抑制風致海面波的影響十分明顯,且降雨造成的信號衰減隨降雨強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)變化隨降雨強度的增大而增加,隨入射角的增大而減小。實例表明本文建立的模型能夠有效改善降雨條件下SAR風場的反演精度。
[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】： 浙江大學海洋學院;國家海洋局第二海洋研究所衛(wèi)星海洋環(huán)境動力學國家重點實驗室;
【基金】：國家自然科學基金(41321004,41306191,41306192,41406203,41676167) 國家863項目(2013AA09A505) 中國科技部-歐洲空間局合作“龍計劃”四期項目(32249) 全球變化與海氣相互作用專項國際合作項目(GASI-IPOVAI-04)
【分類號】：P714.2
【正文快照】： 杭州310012)1引言海面風場是海氣相互作用研究中非常重要的參數(shù),而臺風作為天氣尺度上最為強烈的海氣相互作用之一,其風場信息也成為最難監(jiān)測的物理量之一。傳統(tǒng)的觀測手段包括浮標、海洋站、不定期的船舶報告等,效率低、成本高,所獲數(shù)據(jù)往往是零星分布的點數(shù)據(jù),在時間和空間，

本文編號：1376849