红外相机实时绝对辐射定标技术研究

辐射定标技术是实现定量遥感的关键环节。近年来，随着红外遥测技术愈发成熟，星上红外辐射定标已成为空间定量遥感技术的重要发展方向。文中从红外相机实时绝对辐射定标的背景出发，提出了半光路星上绝对辐射定标和基于多温度场的场地绝对辐射定标方法，结合实验数据，分别采用星上定标、场地定标、交叉定标三种方案进行在轨绝对辐射定标实验验证，并对其适用场景进行了分析。结果表明，通过结合半、全光路定标数据处理和转换技术，利用水面场和陆面场的场地绝对辐射定标方法，优选合适的定标场地，同时在陆面场中增加典型地物场景实现多温度场定标的方法，所提出的辐射定标方法实现了实时高精度绝对辐射定标，定标精度优于1.5 K。

Research on real-time absolute radiometric calibration technology of infrared cameras

Radiometric calibration technology is the key link to realize quantitative remote sensing. In recent years, with the maturity of infrared telemetry technology, onboard infrared radiation calibration has become an important development direction of space quantitative remote sensing technology. Based on the background of real-time absolute radiometric calibration of infrared cameras, this paper puts forward the semioptical path on-board absolute radiometric calibration and site absolute radiometric calibration based on multitemperature field. Combined with the experimental data, three schemes of onboard calibration, site calibration and cross calibration are used to verify the on-orbit absolute radiometric calibration experiment. The applicable scenarios of onboard calibration, site calibration and cross calibration are analysed. The results show that by combining the semi and all optical calibration data processing and conversion technology, using the site absolute radiation calibration method of the water surface field and land surface field, a suitable calibration site is selected, and typical ground object scenes are added to the land surface field to realize multitemperature field calibration. The radiometric calibration method proposed in this paper realizes real-time high-precision absolute radiometric calibration, and the calibration accuracy is better than 1.5 K.