中国遥感卫星辐射校正场陆表发射率光谱是利用陆表场地进行遥感器红外通道绝对辐射定标的关键因子之一。 基于光谱平滑的温度与发射率分离反演迭代算法, 利用高精度的BOMEM MR154傅里叶变换红外光谱仪和红外标准板, 对敦煌戈壁陆表发射率光谱进行测量。 获得了不同时间和地点测量的陆表发射率光谱数据, 并与利用CE312通道式红外辐射计在相同区域的测量结果进行比较分析。 结果表明各个通道发射率的差别均在0.012以内, 具有较好的一致性。 利用该发射率光谱测量结果, 可以在敦煌戈壁——中国遥感卫星辐射校正陆面场, 对目前国内外主流的遥感卫星热红外通道进行在轨场地绝对辐射定标。

Gobi surface emissivity spectrum of Dunhuang radiometric calibration site of China is one of the key factors to calibrate the thermal infrared remote sensors using land surface. Based on the iterative spectrally smooth temperature/emissivity separation (ISSTES)algorithm, Dunhuang Gobi surface emissivity spectrum was measured using BOMEM MR154 Fourier transform spectroradiometer and Infrared Golden Board. Emissivity spectrum data were obtained at different time and locations. These spectrum data were convolved with the channel response function of CE312 radiometer and compared with the channel emissivity measured by the same instrument. The results showed that the difference between these two kinds of channel emissivity was within 0.012 and exhibited a good consistency. With these measured emissivity spectra, all of the mainstream thermal infrared remote sensors can be calibrated using Dunhuang Gobi surface at radiometric calibration site of China.