为了获得高信噪比影像数据,天宫一号高光谱成像仪采用了运动补偿技术增加探测器积分时间的成像模式.针对此种成像方式,本文分析了成像仪的成像特点与发射镜的运动规律,建立了反射镜角度与观测矢量的几何关系,形成了基于天宫一号高光谱成像仪的严密成像几何模型.该模型符合反射镜运动补偿条件下像点与对应地物点的几何关系,通过理论精度分析和实际应用验证了纠正模型的正确性,并能获得与理论相符的实际几何定位精度.

In order to obtain higher signal-to-noise ratio, hyperspectral spectrometer typically adopts motion compensation techniques to increase the integration time of detector imaging. To the mirror motion compensation mode, the imaging characteristics are analyzed and a geometric relation between mirror angle and the observation vector is established. Based on the collinearity equations, a rigorous geometric model of this kind of spectrometer can be established. The model describes the physical properties of the imaging spectrometer through the relationship between the image and the ground coordinate system. The test results indicate that the validity of the model and high-precision imaging products can be obtained.