敦煌场地光谱发射率和温度是基于敦煌辐射定标场开展卫星遥感器热红 外波段在轨辐射定标的重要参数。利用便携式傅里叶变换红外光谱仪(D&P 102F)和红外标准板在2018年8月 对敦煌辐射校正场地表发射率光谱进行了不同时间和观测条件下的多次测量。基于光谱多次迭代平滑温度与 发射率分离算法(ISSTES), 通过设置不同精度的温差间隔,对测得的野外光谱数据进行多次迭代平滑分析处理, 实现了敦煌场地光谱发射率与温度的分离。与采用多通道法温度与发射率分离算法获得的CE312通道发射率进行 比较,结果表明各个通道发射率的误差均在0.011以内,验证了试验获得的敦煌场地光谱发射率和温度具有较好的 精度。本试验为基于敦煌定标场开展卫星遥感器热红外通道在轨辐射定标提供参考。

The spectral emissivity and temperature of the Dunhuang site, China, are important parameters for on-orbit radiometric calibration in thermal infrared band of satellite remote sensor based on the Dunhuang radiometric calibration test-site. In August 2018, the surface spectral emissivity of Dunhuang radiometric calibration test-site were measured repeatedly under different time and observation conditions using a portable Fourier transform infrared spectrometer (D&P 102F) and an infrared standard plate. Based on the iterative spectrally smooth temperature and emissivity separation algorithm (ISSTES), the spectral emissivity and temperature of Dunhuang site are separated by setting the temperature difference interval with different precisions and performing multiple iterative smoothing analysis on the measured field spectral data. Compared with the emissivity of CE312 channel obtained by multi-channel temperature and emissivity separation algorithm, the results show that the deviation of emissivity of each channel is within 0.011, which verifies the spectral emissivity and temperature of Dunhuang site obtained in this work have better accuracy. This experiment provides a reference for the on-orbit radiation calibration of satellite remote sensors based on the Dunhuang calibration field.