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在对热红外辐射计CE312定标的基础上,基于青海湖水面辐射校正场,采用CE312开展同步测量实验,对HJ-1B卫星热红外通道进行在轨绝对辐射定标。由于HJ-1B卫星在轨星上定标系统不稳定,高温点难以准确获取,因此分别使用单点法和两点法,对2010年8月1日和5日两组传感器入瞳等效辐亮度值和卫星通道计数值回归得到该卫星通道绝对定标系数,并使用内蒙达里湖水面辐射校正场2010年6月29日实测数据进行定标系数的验证工作。验证结果表明,青海湖场地两次定标系数有较好的一致性,定标结果稳定可信。两点法所得定标系数的精度高于单点法。
Based on the calibration of the thermal infrared radiometer CE312, based on the surface water correction field of Qinghai Lake, CE312 was used to carry out synchronous measurement experiment to calibrate the orbit absolute radiation of HJ-1B satellite thermal infrared channel. Due to the instability of the calibration system of HJ-1B satellite orbiting satellite, it is difficult to accurately obtain the high-temperature point. Therefore, the single-point method and the two-point method are respectively used to measure the entrance pupil of the HJ-1B satellite on August 1 and 5, Brightness value and satellite channel count value of the satellite channel to obtain the absolute calibration coefficients, and the use of Inner Mongolia Dali Lake surface radiation correction field June 29, 2010 measured data to verify the calibration coefficient. The verification results show that there is a good consistency between the two calibration coefficients of Qinghai Lake site, and the calibration result is stable and credible. The accuracy of the calibration coefficients obtained by the two-point method is higher than that of the single-point method.