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CCD卫星相机时间序列定标--以CBERS02B为例

高海亮,顾行发,余涛,李小英,巩慧,李家国   

  1. 中国科学院遥感应用研究所
  • 收稿日期:2010-01-13 修回日期:2010-08-08 出版日期:2011-04-25 发布日期:2011-04-25
  • 通讯作者: 顾行发

Time-Series Calibration Research for CCD Camera——Taking CBERS02B Satellite as an Example

  • Received:2010-01-13 Revised:2010-08-08 Online:2011-04-25 Published:2011-04-25

摘要: CBERS02B卫星是中巴资源系列卫星的第三颗星,自2007年9月成功发射到现在,已经在轨运行两年多。本文采用沙漠场景法、稳定目标法和交叉定标法对CBERS02B星的CCD相机开展时间序列定标,分别得到CCD相机2007年-2008年期间三种方法对应的定标系数,并同CBERS02B卫星官方提供的定标系数进行比对。结果表明,三种方法得到的定标系数其精度均高于10%,不同方法的结果具有较好的一致性,。最后,本文分析总结了各种时间序列定标方法的优缺点,为今后开展类似卫星的时间序列定标提供参考。

Abstract: CBERS02B is the third satellite of CBERS (China-Brazil Earth Resources Satellite) series satellites, which was launched in Sep. 2007, and works normally more than two years since then. The sensor on satellite is usually attenuated because of the intense ultraviolet radiance and cold space environment at the top of atmosphere. Three methods had been used to calibrate the CBERS02B CCD Camera in time series, which were desert sense calibration method, pseudo-invariance target calibration method and cross-calibration method, and the CBERS02B CCD calibration coefficients of three methods during 2007-2008 had been calculated. Desert sense calibration method supposes that the test site ground and atmospheric is invariance, and only the solar angle and Earth-Sun distance are changed. Pseudo-invariance target calibration method considers that test site atmospheric is variance, but the ground reflectance is steady. Cross-calibration method uses MODIS as reference sensor, and calculates time series calibration coefficient of CBERS02B CCD camera by processing the image pairs of MODIS and CBERS02B CCD image of Dunhuang test site. The relative differences of three methods’ calibration coefficients were less than 10%. Furth more, CBERS02B official calibration coefficient was used to validate the precision of three methods’ calibration coefficients and the results were very ideal. In the end, the advantage and disadvantage of time series calibration method were analyzed, which would be useful for other similar satellites in future.