资源简介

摘要： 作为我国第一个星载微波遥感仪器,搭载在FY\|3B上的微波成像仪(MWRI)的数据质量和应用前景引起了广大科研工作者的普遍关注。为充分了解该传感器的数据质量,采用星星交叉对比的方法,以极地为研究区域,AMSR\|E亮温数据作为对比值,开展针对MWRI的亮温数据处理和评价等工作。研究结果表明:MWRI与AMSR\|E对极地区域的观测数据基本一致,整体趋势略偏小1.64 K;亮温差异随目标亮温的变化而变化,偏差值与亮温值呈正相关;不同通道比较,10 v和36 v对比结果最差,偏差绝对值和均方根误差均超过3 K;10、18和23 h通道对比结果最好,平均偏差绝对值小于0.8 K,均方根误差小于1.4 K,小于3 K的误差比例在98%以上;从线性回归分析所得斜率、截距、可决系数和均方根误差值显示,两者点对点数据值存在一定的偏差,但在数值整体趋势上具有明显的一致性,H极化比V极化对比结果更好;不同间隔的观测时次结果表明,间隔时间越长,V极化的对比差异越大。 关键词： 被动微波;  亮度温度;  交叉对比;  MWRI;  AMSR-E     Abstract: As the first spaceborne microwave remote sensing instrument in China,the Microwave Radiation Imager on FY\|3B has aroused widespread concern from science researchers in some fields,such as data quality and applications.In order to fully understand the performance of MWRI data,method comparison between satellites is used in this paper.The polar region ice sheet is as the study area,and AMSR\|E data is considered as the standard data.Data Processing and accessment are implemented on MWRI brightness temperature data.It is indicated that there is no significantly difference between MWRI brightness temperature data and AMSR\|E.The brightness temperature varies with target data,and there is a positive correlation between the both.Compared with different channels,the results of 10 v and 36 v are worst with more than 3 K absolute deviation and root mean square error.The result of 10,18 and 23 h are the best,with mean deviation less than 0.8 K,and root mean square error is less than 1.4 K and there is more than 98% bias is less than 3 K .The results of linear regression analysis show that there is obvious consistency in data trend.The polarization of H is better than V.The resules of different observation intervals illustrate that  the longer the time interval is,the bigger V polarization contrast differences are.

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