第19卷
S集
2011年5月
1004-924X(2011)05-1054-07
文章编号
光学精密工程
Optics and Precision Engineering
Vol.19
No.5 May 2011
基于差分法的空间相机像移速度失量计算
王运1.2*，颜昌翔1
（1.中国科学院长春光学精密机械与物理研究所，吉林长春130033；
2.中国科学院研究生院，北京100039）
摘要：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失量计算模型。首先，应用坐标变运动情况。然后，根据目标像点在成像面上的勾速运动规律，提出对像点位置坐标进行差分计算求得像移速度失量的方法。最后，对提出的方法与基于坐标变换的像移速度失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失量计算中。
关
键
调：坐标变换；差分法；像移速度失量；空间相机
中图分类号：V475.1;V447.3
文献标识码；A
doi:10. 3788/OPE, 20111905. 1054
Computationof imagemotionvelocityvectorforspace
camerabasedondifferencemethod
WANG Yun'-2-,YAN Chang-xiang
(1.ChangchunInstituteof Optics,FineMechanicsandPhysics,
ChineseAcademyof Sciences,Changchun130033,China;
2.GraduateUniversity ofChineseAcademy of Sciences,Beijing100039,China)
*Correspondingauthor,E-mail:qinghyun2007@163.com
Abstract: A calculating model based on difference method was proposed to calculate the image motion velocity vector to compensate precisely the image motion of a space camera, Firstly, the earth imaging model was established by utilizing coordinate transformation,and the relative motion between the im-age point and the image plane was analyzed in vertical, roll and pitch attitudes according to the states of the image motion, Then, a method was proposed to calculate the image motion velocity vector ac-cording to the law of the relative motion between the image point and the image plane.Finally,the proposed method was compared with the coordinate transformation method.The result shows that the error between the two methods is within O. 1%, which proves the efficiency of this method. The pro posed method overcomes the complex compulation from traditional methods and can be used in calcu-lating the image motion velocity vectors for other space cameras.
Key words: coordinate transformation; difference method; image motion velocity vector; space camera
收稿日期：2010-07-05；修订日期：2010-08-12
基金项目：国防预研基金资助项目（No.O5001SA050）