大气环境红外甚高光谱分辨率探测仪设计与实现

摘要

As a spaceborne spectrometer with the highest spectral resolution so far in china, the Atmospheric Infrared Ultra-spectral Sounder(AIUS) on board GF-5 satellite is based on temporal Fourier Transform Spectrometer technology, which covers spectral range of 750~4 160 cm-1(2.4~13.3 μm)and archives spectral resolution of 0.03 cm-1. The technical difficulties and features of the payload include high spectral resolution spectroscopy and autonomous precise sun-tracking. The high spectral resolution has been achieved by making use of scan-arm corner cube Fourier Transform Spectrometer with large optical path difference, and autonomous precise sun-tracking has been carried out via sun-tracker with image feedback. This paper reviews the development situation of AIUS, including system design, key technologies and their implementation, the on-orbit sun-tracking strategy is also described as well as the atmospheric refraction correction, the related information would be helpful for system design of hyperspectral Fourier Transform Spectrometer or solar occultation payload.%GF-5 卫星的大气环境红外甚高光谱分辨率探测仪是中国目前光谱分辨率最高的红外超光谱探测载荷,它基于时间调制傅里叶变换光谱探测技术,通过太阳掩星观测方式在 750~4 160cm–1 (2.4~13.3μm)光谱范围内,实现光谱分辨率 0.03cm–1的大气透射光谱探测.该载荷的两大技术特点和难点是高光谱分辨率和自主精密太阳跟踪,采用大光程差摆臂角镜傅里叶变换光谱仪实现了红外宽谱段、高分辨率光谱探测,研制了图像反馈太阳跟踪装置实现在轨自主精密太阳跟踪.文章回顾了该载荷的系统设计、关键技术及实现情况,给出了地面测试与试验结果,可为同类载荷研制提供参考.