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为了满足HJ-1星遥感数据定量化应用的需求,2008年10月中旬,以敦煌定标实验场为地面目标,采用反射率基法对HJ-1A和HJ-1B星的CCD相机开展场地绝对辐射定标,以确定CCD相机响应的变化,并对得到的定标结果进行了误差分析。同时利用非定标同日的敦煌场和贡格尔实验场的CCD星地同步数据得到的表观辐亮度作为标准值,对定标系数进行真实性检验研究。结果表明,定标系数模拟出的CCD表观辐亮度与标准值非常接近,误差均小于3%。研究表明:此次定标实验的结果精度高,并将两次同步数据的定标系数平均值作为定标系数结果,为CCD相机定量化应用研究奠定了良好基础。
In order to meet the demand of quantitative application of HJ-1 satellite remote sensing data, in mid-October 2008, using the Dunhuang calibration experiment ground as the ground target, the reflectivity basis method was used to carry out the absolute location of CCD cameras of HJ-1A and HJ-1B stars Radiation calibration to determine the CCD camera response changes, and the resulting calibration results were error analysis. At the same time, by using the apparent radiance obtained from CCD star-gensynchronous data of Dunhuang field and Gong’ger experiment site on the same day of non-calibration as the standard value, the verification of the calibration coefficient was carried out. The results show that the apparent radiance of the CCD simulated by the calibration coefficient is very close to the standard value, and the errors are all less than 3%. The results show that the calibration results are accurate and the average of the calibration coefficients of the two synchronized data is used as the calibration coefficient, which lays a good foundation for the quantitative research of CCD camera.