本文選題：面元匹配　切入點(diǎn)：海洋二號(hào)　出處：《遙感學(xué)報(bào)》2017年06期

【摘要】：面元匹配是散射計(jì)海面風(fēng)場反演的重要預(yù)處理步驟。為保障海洋二號(hào)衛(wèi)星散射計(jì)(HSCAT)業(yè)務(wù)化海面風(fēng)場反演,提出了一種可業(yè)務(wù)化運(yùn)行的HSCAT面元匹配算法。HSCAT面元匹配算法包括地面網(wǎng)格劃分和后向散射系數(shù)觀測結(jié)果重采樣兩個(gè)關(guān)鍵部分。為簡化計(jì)算,HSCAT采用以星下點(diǎn)軌跡為中心,以順軌向及交軌向?yàn)樽鴺?biāo)軸,分辨率為25 km×25 km的網(wǎng)格劃分方式。重采樣利用衛(wèi)星星下點(diǎn)經(jīng)緯度數(shù)據(jù),對(duì)每個(gè)后向散射系數(shù)觀測結(jié)果,以后向散射系數(shù)與各星下點(diǎn)球面距離的最小值為依據(jù)進(jìn)行交軌向重采樣,并以取得距離最小值所對(duì)應(yīng)的星下點(diǎn)與該軌數(shù)據(jù)星下點(diǎn)起始位置的距離為依據(jù)進(jìn)行順軌向重采樣,實(shí)現(xiàn)對(duì)后向散射系數(shù)觀測結(jié)果的面元匹配。實(shí)驗(yàn)和對(duì)比結(jié)果表明,提出的面元匹配算法可對(duì)后向散射系數(shù)進(jìn)行有效的重采樣,風(fēng)矢量面元的位置分布均勻,每個(gè)風(fēng)矢量面元均有足夠數(shù)量的獨(dú)立觀測后向散射系數(shù),可在全球范圍內(nèi)滿足高質(zhì)量海面風(fēng)場反演的要求。
[Abstract]:Surface matching is an important preprocessing step for wind field inversion of a scatterometer.In order to ensure the operational sea surface wind field inversion by HSCAT2 satellite scatterometer,In this paper, an operational HSCAT matching algorithm is proposed. The algorithm consists of two key parts: ground mesh generation and backscatter coefficient resampling.In order to simplify the calculation of HSCAT, a meshing method with a resolution of 25 km 脳 25 km is adopted, which centers on the track of the point below the star and takes the direction of the orbit along the orbit and the direction of the intersection as the coordinate axis.Based on the longitude and latitude data of satellite sub-satellite, the results of each backscattering coefficient and the minimum distance between the backscatter coefficient and the spherical surface under each star are used as the basis for cross-orbit resampling.Based on the distance between the minimum distance and the starting position of the lower point of the orbit data, the forward orbit resampling is carried out to match the measured results of the backscattering coefficient.The experimental and comparative results show that the proposed algorithm can effectively resample the backscatter coefficients, and the wind vector elements are uniformly distributed, and each wind vector plane has a sufficient number of independent observed backscatter coefficients.It can meet the requirements of high quality sea surface wind field inversion in the global scope.
【作者單位】： 國家衛(wèi)星海洋應(yīng)用中心;國家海洋局空間海洋遙感與應(yīng)用研究重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家科技支撐計(jì)劃項(xiàng)目(編號(hào):2013BAD13B01) 國家自然科學(xué)基金(編號(hào):41576177) 國家發(fā)改委高技術(shù)產(chǎn)業(yè)化項(xiàng)目(編號(hào):[2012]2083) 海洋公益項(xiàng)目(編號(hào):201305032)~~
【分類號(hào)】：TP73

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本文編號(hào)：1713818