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针对HJ-1B红外相机(IRS)热红外通道特点,利用青海湖辐射校正场进行HJ-1B热红外绝对辐射定标,提出新的场地定标算法,并通过实测数据和Landsat5-TM数据对不同定标系数进行真实性检验分析,发现该场地定标算法获得的系数比原始系数精度提高约0.6%—3%,总体精度为1K左右。研究结果表明文章提出的定标算法适用于不具备观测冷空间能力的卫星传感器在轨绝对辐射定标,得到的定标系数合理可靠。
According to the characteristics of thermal infrared channel of HJ-1B infrared camera (IRS), the calibration of HJ-1B thermal infrared radiation using Qinghai Lake radiation correction field was proposed. A new site calibration algorithm was proposed. Based on the measured data and Landsat5-TM data, The calibration coefficient is verified by the authenticity test. It is found that the coefficient obtained by the site calibration algorithm is about 0.6% -3% higher than the original coefficient, and the overall accuracy is about 1K. The results show that the calibration algorithm proposed in this paper is suitable for calibration of on-orbit absolute radiation of satellite sensors without capability of observing cold space, and the calibration coefficients obtained are reasonable and reliable.