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为了实现空间相机精密像移补偿,提出了一种基于差分法的空间相机像移速度矢量计算模型。首先,应用坐标变换建立空间相机对地成像模型,分析了空间相机在垂直摄影、侧摆摄影和前后摆摄影时,目标像点与成像面之间的相对运动情况。然后,根据目标像点在成像面上的匀速运动规律,提出对像点位置坐标进行差分计算求得像移速度矢量的方法。最后,对提出的方法与基于坐标变换的像移速度矢量计算方法进行了比较。结果表明,两种计算方法的相对误差在0.1%以内,验证了该方法的正确性。该方法避免了传统坐标变换法复杂的微分计算,提高了计算速度,亦可应用于同类遥感器的像移矢量计算中。
In order to realize precise image shift compensation of space camera, a new method of calculating the image velocity vector of space camera based on the difference method is proposed. Firstly, the imaging model of the space camera is established by using the coordinate transformation. The relative motion between the target image point and the imaging plane is analyzed when the space camera is in vertical photography, side photography and front and back photography. Then, based on the uniform motion of the target point on the imaging plane, a method of calculating the image velocity vector by calculating the difference of the coordinates of the target point is proposed. Finally, the proposed method is compared with the method based on coordinate transformation to calculate the image velocity vector. The results show that the relative errors of the two methods are within 0.1%, which verifies the correctness of the method. The method avoids the complicated differential calculation of the traditional coordinate transformation method, increases the calculation speed, and can also be applied to the image shift vector calculation of the same type of remote sensor.