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通过构建适用于HJ-1B热红外通道(IRSB08)特性的有效波段宽度计算方法,提高HJ-1B B08在轨星上绝对辐射定标的精度。根据HJ-1B星上定标原理、利用卫星发射前地面实验数据和Planck方程,建立基于定标黑体温度的有效波段宽度计算的查找表法,结果表明查找表法得到的有效波段宽度为2.01μm左右,介于半高宽法1.940μm和矩方法2.394μm之间,且与定标黑体温度的关联性很小,在低温点和高温点之间的相对差异在0.3%以内。半高宽法和矩方法分别低估和高估有效波段宽度,导致定标后的表观辐射亮度分别偏高和偏低,不适用于HJ-1B B08特点,查找表法定标的表观辐亮度与星地同步实验结果非常相近,绝对误差为0.04 W·m~(-2)·sr~(-1)·μm~(-1),对应的亮度温度误差为0.4 K左右,能很好的应用于HJ-1B B08在轨星上绝对辐射定标。
The accuracy of absolute radiation calibration of HJ-1B B08 on orbiting satellite is improved by constructing an effective bandwidth calculation method suitable for HJ-1B thermal infrared channel (IRSB08). According to the calibration principle of HJ-1B satellite, using the ground experimental data and the Planck equation before satellite launch, a look-up table algorithm based on calibrated black body temperature is proposed. The result shows that the effective band width obtained by look-up table method is 2.01μm , Between the half-height-breadth method of 1.940μm and the moment method of 2.394μm, and the correlation with the calibrated blackbody temperature is very small. The relative difference between the low temperature point and the high temperature point is within 0.3%. The half-width method and the moment method underestimate and overestimate the effective band width, respectively, resulting in higher and lower apparent radiance after calibration, which is not suitable for HJ-1B B08 features. The apparent radiances of the lookup table The results of star-geosynchronous experiments are very similar, with an absolute error of 0.04 W · m -2 (-2) · sr -1 · μm -1 and a corresponding temperature error of about 0.4 K, which can be well applied On the HJ-1B B08 absolute orbit calibration on the satellite.