“句芒”号卫星超光谱探测仪设计与系统验证

Design and verification of the spectrometer on“Gou Mang”satellite

随着双碳目标的提出,碳监测定量化遥感技术的发展需求日益迫切,对日光诱导叶绿素荧光定量化的遥感监测可以作为植被实际光合作用效果和碳循环效能评价的重要手段。介绍了“句芒”号卫星的有效载荷之一超光谱探测仪的性能指标、设计方案、系统组成、验证结果及在轨运行情况。超光谱探测仪是面向太阳诱导植被荧光探测的精密光学仪器,系统采用了推扫成像和光栅色散分光的技术方案,经过测试验证,光谱分辨率优于0.3 nm,地面像元分辨率达到1.5 km,典型输入辐亮度条件下系统信噪比优于500,各项指标均满足和优于探测任务需求,具备高光谱分辨率、高信噪比、高稳定性的探测能力,其良好的表现将在植被监测和碳循环应用等方面发挥重要的作用。

With the proposal of the Double Carbon target,the development of quantitative remote sensing technology for carbon monitoring is increasingly urgent.The detection of solar-induced fluorescence can be used as an important means to evaluate the actual photosynthesis effect of vegetation and the carbon cycle efficiency.This paper introduces the performance indicators,design scheme,system composition,verification results and in-orbit operation of the spectrometer on the“Gou Mang”satellite.The spectrometer is a precise optical instrument for solar-induced fluorescence detection.The system adopts a design scheme of pushbroom imaging and grating dispersion spectroscopy.After testing and verification,the spectral resolution is better than 0.3 nm,and the ground pixel resolution reaches 1.5 km.Under typical input radiance conditions,the system SNR is better than 500,and all indicators meet or exceed the detection task requirements.It has high spectral resolution,high SNR and high stability detection capability.Its good performance will play an important role in vegetation monitoring and carbon cycle applications.