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时-空联合调制型干涉成像光谱仪获取的像面干涉图是带有干涉条纹的二维空间图像,具有对姿态变化敏感的特点。根据该类仪器的成像过程,在竖直摄影时,相邻两帧像面干涉图之间的像移量为一列像元;偏离竖直摄影时,由于像面干涉图的几何变形或旋转,会引入非正常像移。利用共线方程导出了这一非正常像移量的表达式。利用仿真计算说明:这一非正常像移会在像面干涉图序列中不断积累,导致提取出的物体干涉信息失真。在竖直摄影而平台指向精度较低、倾斜摄影、探测器阵列的安装方向精度较低或者航空成像且存在偏流角时,必须对像面干涉图进行有效校正,才能保证最终反演出的物体光谱的真实性。
The image-plane interferogram obtained by the time-space combined interferometric interferometric imaging spectrometer is a two-dimensional image with interference fringes, which is sensitive to the change of attitude. According to the imaging process of this kind of instrument, when the vertical photographing is performed, the image shift amount between two adjacent image frame interferograms is one column of pixels; when deviating from the vertical photographing, due to the geometric deformation or rotation of the image surface interferogram, Will introduce abnormal image shift. The collinear equation is used to derive the expression of the abnormal image shift. The simulation calculation shows that this abnormal image shift will accumulate in the image sequence of interferogram, resulting in the distortion of the extracted object interference information. In the vertical photography and the platform pointing accuracy is low, the tilt photography, the detector array installation accuracy is low or aviation imaging and there is a drift angle, you must effectively correct the image surface interferogram in order to ensure the final inversion of the object spectrum Authenticity.