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本文研究最冷目标地物替代法计算Jason-2微波辐射计JMR年度漂移。针对Jason-2卫星微波辐射计(JMR),利用微波辐射计传输模型,建立JMR 3个通道的全球最低亮温观测值的理论计算模型,模拟其3通道全球地物观测最冷亮温;基于2008年—2012年Jason-2地球物理数据(GDR)产品中全球对地观测亮温序列和模型计算的最冷亮温,建立亮温序列的最小观测亮温统计模型,查找全球地物观测最冷亮温序列;根据地物年度变化特性,建立光谱分析模型,去除最冷亮温序列的年度谐波;去除年度谐波后,采用线性拟合的方法外推最冷亮温序列的理论最小值,并据此计算Jason-2微波辐射计仪器的年度漂移量。
In this paper, the coldest target object substitution method is used to calculate the JMR annual drift of the Jason-2 microwave radiometer. According to the model of Jason-2 Satellite Microwave Radiometer (JMR), the theoretical model of the global minimum bright-temperature observation of JMR with 3 channels was established and the coldest observed bright temperature of 3-channel global object was simulated by using the microwave radiometer transmission model. 2008-2012 - The Global Observatory’s Bright Temperature Sequence and the Computed Coefficient of Brightest Temperatures in the Jason-2 Geophysical Data (GDR) Products, Establishing a Minimal Observed Bright Temperature Statistical Model for the Bright-temperature Sequence and Finding the Most Outgritted Global Observations According to the annual variation characteristics of ground objects, a spectral analysis model is established to remove the annual harmonic of the coldest bright temperature sequence. After removing the annual harmonics, the theoretical minimum of the coldest bright temperature and warmth sequence is extrapolated by linear fitting Based on which the annual drift of the Jason-2 microwave radiometer instrument was calculated.