多源极轨气象卫星热红外波段数据的同化方法研究

STUDY ON THERMAL INFRARED DATA ASSIMILATION OF MULTI-SOURCES POLAR ORBIT METEOROLOGICAL SATELLITE

为保证多源极轨气象卫星热红外波段数据的可比性与进一步的定量应用,从辐射和几何两个方面进行了数据同化方法研究.通过辐射定标、卫星天顶角校正和通道光谱响应差异的校正,实现了不同卫星探测辐射值的直接对比;在扫描行空间分辨率归一化的基础上,进行投影变换几何粗校正和图像平移精校正,使多源数据在几何位置上能得以高精度的配准.

In order to ensure the comparability of the thermal infrared data obtained from multi-sources polar orbit meteorological satellite and its further quantitative application, the data assimilation was studied from two aspects of radiation and geometry. By satellite zenith angle correction and different channel spectral response correction, direct comparison of radiance detected by different satellites could be achieved. Based on normalization of spatial resolution in scan line direction, geometric rough correction by projection transform and precious correction by image transfer were processed to register multisources data in geometric positions with higher precision.