风云二号卫星水汽波段在轨辐射定标新方法
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中国气象局国家卫星气象中心,中国气象局国家卫星气象中心,中国气象局国家卫星气象中心,中国气象局国家卫星气象中心

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国家自然科学基金面上项目(40971200、41075019)


A new approach of on-orbit radiometric calibration for water-vapor band of FY-2 satellite
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National Satellite Meteorological Center, China Meteorological Administration,National Satellite Meteorological Center, China Meteorological Administration,National Satellite Meteorological Center, China Meteorological Administration,National Satellite Meteorological Center, CMA

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    摘要:

    将月球作为热发射波段定标参考源,在无需月表发射率和温度信息条件下,通过引入UDER参数,建立了不同热发射波段观测辐亮度间定量关系,并导出了新的波段间交叉定标方法。同时,利用FY-2E卫星多波段月球观测结果,以辐射精度较高的热红外波段为基准,在无星载全光路黑体情况下,初步实现了水汽波段在轨高精度辐射定标,且在200~220 K低温区间内的定标精度平均提高约3.5 K,并显著改善了云分类等定量产品的性能

    Abstract:

    Considering the Moon as a reference source for thermal emissive band (TEB) calibration without any knowledge of lunar surface’s emissivity or temperature, the quantitative relationship of the measured radiances between different TEBs is established by introducing the parameter universal dual-band emissivity ratio (UDER) and further used to deduce a novel cross-calibration approach between different bands. Meanwhile, selecting the thermal infrared band with the higher radiometric accuracy as a baseline, the on-orbit radiometric calibration for water-vapor band of FY-2E satellite is basically realized by using multi-bands lunar observations without any space-borne full-path blackbody. The radiometric calibration accuracy has been averagely improved by about 3.5K in the lower temperature region between 200K and 220K, which greatly benefits to the enhancement of some quantitative products significantly, i.e. cloud classification.

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郭强,陈博洋,杨昌军,冯绚.风云二号卫星水汽波段在轨辐射定标新方法[J].红外与毫米波学报,2012,31(6):523~527]. GUO Qiang, CHEN Bo-Yang, YANG Chang-Jun, FENG Xuan. A new approach of on-orbit radiometric calibration for water-vapor band of FY-2 satellite[J]. J. Infrared Millim. Waves,2012,31(6):523~527.]

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  • 收稿日期:2011-09-09
  • 最后修改日期:2012-03-15
  • 录用日期:2011-10-13
  • 在线发布日期: 2012-11-21
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