基于FY-3C星微波成像仪毫米波通道的海面大风算法研究  

Study on Ocean Surface Wind Speed Algorithm Based on FY-3C Microwave Imager Millimeter Band

作　　者：安大伟[1] 窦芳丽[1] 张鹏[1] 

机构地区：[1]中国气象局国家卫星气象中心,北京100081

出　　处：《上海航天》2017年第4期38-42,共5页Aerospace Shanghai

基　　金：国家自然科学基金资助(41105009;61527805)

摘　　要：对基于FY-3C星微波成像仪(MWRI)毫米波通道的海面大风算法进行了研究。根据在中国海域观测到的海面后向热辐射数据,认为联合多个毫米波通道分析方法可利于海面大风反演。对中低风速(0~15m/s)下D-矩阵算法进行修正,给出了适于MWRI的海面风速反演新模型。与浮标数据拟合结果表明:FY-3B,C星MWRI均方差(RMS)分别为1.24,1.18m/s。用带泡沫散射层的双尺度随机粗糙面的复合模型计算后向热发射。考虑各通道频率、灵敏度和定标精度等因素,用回归分析法分析了各通道热辐射特性随海面风速变化的不同响应特性,建立了适于FY-3C星MWRI的大风风速反演模型。中低风速模型和大风速模型反演的全球海面风速分布结果表明:中低风速精度标准差1.2m/s;反演大风数据和海岛固定浮标数据有一致性,模型的实际应用效果较好,可为我国沿海的大风监测和预警提供保障。The ocean surface wind speed algorithm based on millimeter band of microwave imager （MWRI） of FY-3C meteorological satellite was studied in this paper.According to the thermal radiation of sea surface data observed in Chinese waters,it is believed that a joint multi-millimeter channel analysis method is in favor of ocean surface wind retrievals.The D matrix algorithm was modified for medium and low wind speed （0~15m/s）.The new retrievals mode of ocean surface wind speed for MWRI was presented.The fitting results with buoy showed that RMS of FY-3B and FY-3C MWRI were 1.24 and 1.18m/s respectively.The random rough surface after the heat emission was calculated relying on scattered with foam dual scale layer composite mode.With the consideration of frequency,sensitivity and calibration accuracy of each channel,different response characteristics of the heat radiation characteristics of each channel along with the ocean surface wind speed was analyzed using regression analysis method.The retrievals mode of ocean surface wind speed was established for MWRI of FY-3C satellite.The global ocean surface distribution inversed by medium and low wind speed mode and ocean surface wind speed mode showed that the mean square error was 1.2m/s for medium and low wind speed and the wind speed inversed was agreed with the fixed buoy in island.The two modes have been applied well,which can provide a guarantee for inshore wind monitoring in China.

关 键 词：FY-3卫星 微波成像仪 海面大风 毫米波通道 反演 回归分析法 全球海面风速分布 

分 类 号：TP701[自动化与计算机技术—检测技术与自动化装置] P425.47[自动化与计算机技术—控制科学与工程]