【6h】

Performance of the Imaging Spectral Signature Instrument (ISSI) breadboard

机译:成像光谱签名仪(ISSI)面包板的性能

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With hyperspectral pushbroom imaging spectrometers it is possible to identify ground pixels by their spectral signature. The Imaging Spectral Signature Instrument (ISSI) concept performs optical on-board processing of the hyperspectral data to identify pixels with a pre-defined and programmable spectral signature. An aircraft compatible breadboard of ISSI has been developed and manufactured. It consists of an objective, which images an object line on the input slit of a first imaging spectrograph, which disperses each pixel of the object line into its spectral content on a liquid-crystal spatial light modulator. This component is programmed with a spatial transmission behaviour, which is constant along the spatial pixels and equal to the spectral filter vector of the searched specific signature along the spectral pixels. A second inverted spectrograph re-images the transmitted flux into a line of pixels on a CCD detector. ISSI operates at wavelengths between 470 nm and 900 nm. The spectral filter vector can be selected for 800 spatial pixels with a spectral resolution of better than 4 nm and almost 8 bit modulation capability. ISSI effectively performs the spectral angle mapping (SAM) operation used in hyperspectral data processing. The signatures are acquired with ISSI in a spectrometer operating mode. The breadboard has undergone a test program consisting of calibration and verification of the spectral, spatial and radiometric performance and object identification capability.
机译:使用高光谱推扫式成像光谱仪,可以通过其光谱特征识别地面像素。成像光谱签名仪(ISSI)概念对高光谱数据执行光学车载处理,以识别具有预定义和可编程光谱签名的像素。已开发和制造了ISSI的飞机兼容面包板。它由一个物镜组成,该物镜将物线成像在第一个成像光谱仪的输入狭缝上,该物镜将物线的每个像素分散到液晶空间光调制器上的光谱内容中。通过空间传输行为对该组件进行编程,该行为沿空间像素恒定,并且等于沿光谱像素搜索的特定特征的光谱过滤矢量。第二台倒置光谱仪将透射的通量重新成像为CCD检测器上的像素线。 ISSI在470 nm至900 nm之间的波长下工作。可以为800个空间像素选择光谱滤波器矢量,其光谱分辨率优于4 nm,几乎具有8位调制能力。 ISSI有效地执行了高光谱数据处理中使用的光谱角度映射(SAM)操作。签名是通过ISSI在光谱仪操作模式下获取的。面包板已通过测试程序,包括光谱,空间和辐射测量性能以及物体识别功能的校准和验证。

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