Lookup table method of effective bandwidth for HJ-1B B08 on-board radiometric calibration
HJ-1B B08 在轨星上定标有效波段宽度计算的查找表法

Improve HJ-1B B08 on-board absolutely radiometric calibration precision by virtue of a constructed lookup table (LUT) method that fit for HJ-1B B08 characteristic to calculate its effective bandwidth. LUT method is based on HJ-1B on-board radiometric calibration theory, pre-launched experiment datum and Planck formula. As a result, HJ-1B B08 effective bandwidths are 2.01 ?m, 1.940 ?m and 2.394 ?m corresponding to LUT method, FWHM method and moments method (MM). LUT method has low association to blackbody temperature, and the relative difference is 0.3% between normal temperature and high temperature state. FWHM method and MM method are either higher or lower, and the calibrated top of atmospheric (TOA) radiance is either lower or higher, so they are not fit for HJ-1B B08 characteristic. LUT method gives a result that very close to field experiment, and the absolutely error is 0.04 W·m?2·sr?1·?m?1corresponding to approximately 0.4 K TOA radiant temperature error, so it can be better when used to HJ-1B B08 on-board absolutely radiometric calibration.