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介绍利用高光谱探测器IASI和AIRS对FY-2静止气象卫星VISSR红外通道进行绝对交叉定标的方法,并且基于FY-2E业务运行以来的历史数据对该方案进行可靠性检验和误差分析。结果表明,基于两个独立仪器得到的高光谱定标结果间具有很好的一致性;高光谱定标的亮温偏差基本上呈正态随机分布没有明显的系统偏差,平均亮温偏差小于0.07K,标准差约1.4K,其中亮温大于290K时,平均偏差小于0.2K,亮温大于220K时,平均偏差小于1K,低温端平均偏差约为3K;本文方法与目前FY-2EL1文件中提供的定标结果相比有明显改善,精度平均提高大于1K,低温端2—3K。长时间统计分析结果证明文中采用高光谱交叉定标方案稳定可靠,精度能够满足定量应用需求。
This paper introduces the method of absolute cross-calibration of the FY-2 stationary meteorological satellite VISSR infrared channel by using hyperspectral detectors IASI and AIRS, and performs reliability checking and error analysis based on the historical data of FY-2E business operation. The results show that there are good agreement between hyperspectral calibration results obtained by two independent instruments. The deviation of bright temperature and temperature of hyperspectral calibration is basically normal random distribution with no obvious systematic deviation and the average bright temperature deviation is less than 0.07 K, the standard deviation of about 1.4K, where the brightness temperature is greater than 290K, the average deviation of less than 0.2K, bright temperature greater than 220K, the average deviation of less than 1K, low-temperature end of the average deviation of about 3K; this method and the current FY-2EL1 file Compared to the calibration results have significantly improved, the average accuracy of more than 1K, 2-3K low end. The results of long-term statistical analysis prove that the Hyperspectral Cross-calibration scheme is stable and reliable, and the accuracy can meet the needs of quantitative applications.