偏流角对品字形拼接探测器成像的影响

摘要

遥感卫星成像时，由于地球运动方向与飞行器运动方向之间存在偏流角，使得卫星存在横向像移速度，造成像移，从而影响遥感图像的品质。文章针对采用品字形拼接的探测器进行了分析，给出了其成像模式；根据偏流角的产生机制和计算方法，分析了偏流角对其成像的影响；并根据偏流角随纬度变化的具体形式，给出了不同纬度下偏流角的影响情况；结合太阳同步轨道的具体实例，提出了在符合谱段配准精度的要求下，偏流角控制的偏差范围；并对偏流角控制存在偏差时，给出了地面水平偏移量大小以及为满足配准精度要求的谱段间隔距离。%In satellite imaging with CCD camera, there is a drift angle between earth self-rotating. Be-cause the drift angle can bring crosswise image motion speed which cause the image motion, it is necessary to analyze the influence on image quality. In this paper, an imaging mode of the Three Non-collinear CCD chips is proposed. According to the mechanism and calculation approach of the drift angle, the effect of the drift angle on three non-collinear CCD chips is analyzed. Companying with an example of sun-synchronous orbit, the range of drift angle is controlled to reach the image registration accuracy. When the drift angle is out of control, the horizontal displacement is calculated and the minimal distance between different CCD chips is given.