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Monitoring radiometric response change of visible band for FY-2 geostationary meteorological satellite by lunar target

  • role： First author第一作者
  • Email：chenlin@cma.gov.cn
  • Introduction：陈林(1981—　)，男，副研究员，研究方向为卫星资料辐射定标、预处理、气候变化应用。E-mail：chenlin@cma.gov.cn
Lin CHEN,  
  • role： Corresponding author通信作者
  • Email：zhangp@cma.gov.cn
  • Introduction：张鹏(1970—　)，男，研究员，研究方向为遥感仪器定标、卫星大气遥感、卫星资料定量应用。E-mail：zhangp@cma.gov.cn
Peng ZHANG*,  
  • No information about the author is available
Ronghua WU,  
  • No information about the author is available
Xiuqing HU,  
  • No information about the author is available
Lu ZHANG

реферат

The photometric stability of lunar targets is high. The lunar irradiance reflected from the sun can be considered a benchmark for radiance calibration in the visible and near-infrared spectra. Meanwhile, lunar calibration is a new method of calibrating and validating satellite-based instruments. Therefore, a method that uses a lunar target as a stable radiation calibration target and the lunar irradiance model is introduced to carry out the radiation response tracking method of the FY-2 static meteorological satellite. Data from the FY-2E scanning radiometer from January 2010 to October 2014, which contain the moon target by orbit forecast, are collected. After a series of processes, including the extraction of lunar images, calculation of the lunar illumination model and satellite observation lunar irradiance, and correction of distance of sat–moon–sun, the response change of the visible band of the FY-2E scanning radiometer is obtained. Finally, the result is compared with that of the deep convective cloud radiometric calibration method. The main conclusions are as follows. (1) The total degradation of radiometric response is 9.2% with an annual decay rate of 1.96% by the lunar method. The uncertainty and the 95% confidence interval are 2.66% and ± 0.79%, respectively. The results are similar to that of the DCC method, and this affinity shows the validity of the lunar method. (2) The low quantization level (6 bit) and stray light of the FY-2 visible channel can affect the results. (3) In addition to the attenuation trend, the FY-2E radiation response shows the characteristics of seasonal cycle. The lunar radiometric calibration tracking method can effectively monitor sensor response attenuation and be used as radiometric benchmark for visible band calibration in the entire life of the sensor for the improvement of the accuracy of radiometric calibration.

ключеви́че слова́

moon target;lunar irradiance model;FY-2;visible band;radiometric response change

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