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本文描述目前正在TRW为美国航空航天局小卫星技术开创计划(SSTI)制造的超光谱成像器有效载荷(HSI)的设计及性能。超光谱成像器有效载荷是一种用以观察地球的成像光谱仪,这种仪器把两台光栅光谱仪和一台全色摄像机合并成一个紧凑的装置。这种仪器在0.4μm至2.5μm谱区中的384个互相邻接的均匀波段中产生图像。这种超光谱图像具有30m的空间分辨率。一台分辨率为5m的全色摄像机在空间上可进一步增强(突出)超光谱图像。文中介绍了光学系统、焦平面和电子线路。飞行中的定标特征可保持仪器数据的辐射测量精度,计划中这些数据的应用范围包括科学、商业和教育。超光谱成像器有效载荷将于1996年装在“刘易斯”宇宙飞船上飞行,它将是太空中的第一台超光谱成像器。
This article describes the design and performance of the Hyperspectral Imager Payload (HSI) currently being manufactured by TRW for the NASA Small Satellite Technology Initiative (SSTI). The Hyperspectral Imager payload is an imaging spectrometer used to visualize the Earth. The instrument combines two grating spectrometers and a panchromatic camera into one compact device. This instrument produces images in 384 contiguous, uniform bands in the 0.4 μm to 2.5 μm spectral region. This hyperspectral image has a spatial resolution of 30m. A panchromatic camera with a resolution of 5m further enhances (highlights) the hyperspectral image in space. The article describes the optical system, focal plane and electronic circuits. The calibration features in flight maintain the radiometric accuracy of the instrumentation data and the planned application of these data includes science, business and education. The hyperspectral imager payload, which will fly on the “Lewis” spacecraft in 1996, will be the first hyperspectral imager in space.