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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 月球与深空探测重点实验室,北京 100101
3.一汽-大众汽车有限公司,吉林 长春 130011
4.安徽农业大学,安徽 合肥 230036
[ "闫得杰(1979-),女,吉林德惠人,硕士,副研究员,2003年于吉林大学获得学士学位,2010年于中国科学院研究生院获得硕士学位,主要从事飞行器像移补偿、星载嵌入式软件设计等方面的研究。E-mail: yandj2008@163.com" ]
[ "孙兴国(1976-),男,吉林舒兰人,硕士,高级工程师,2000年于华东交通大学获得学士学位,2004年于吉林大学获得硕士学位,主要从事无人驾驶、图像识别等方面的研究。E-mail: xingguo.sun@faw-vw.com" ]
收稿日期:2020-09-18,
修回日期:2020-11-18,
纸质出版日期:2022-01-25
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闫得杰,孙兴国,刘海秋等.基于火星大椭圆轨道像移补偿计算方法[J].光学精密工程,2022,30(02):153-159.
YAN Dejie,SUN Xingguo,LIU Haiqiu,et al.Image motion compensation method based on large elliptical orbit[J].Optics and Precision Engineering,2022,30(02):153-159.
闫得杰,孙兴国,刘海秋等.基于火星大椭圆轨道像移补偿计算方法[J].光学精密工程,2022,30(02):153-159. DOI: 10.37188/OPE.20223002.0153.
YAN Dejie,SUN Xingguo,LIU Haiqiu,et al.Image motion compensation method based on large elliptical orbit[J].Optics and Precision Engineering,2022,30(02):153-159. DOI: 10.37188/OPE.20223002.0153.
为了实现天问一号高分辨率相机在大椭圆轨道下对火星表面高质量成像,建立了基于火星的大椭圆轨道像移计算模型。对大椭圆轨道和像移计算方法进行研究。首先,根据大椭圆轨道的特点,分析大椭圆轨道与近圆轨道存在的差别。接着,依据椭圆特性和角动量守恒原理计算高分辨率相机到火星中心的距离、椭圆运动轨道速度、轨道速度与离心速度的夹角。然后,根据齐次坐标变换的方法将火星景点坐标系与高分辨率相机坐标系建立联系,通过对位置关系的求导得出像移速度。最后,通过动态成像试验验证了像移补偿计算方法的正确性和对图像质量的影响。实验结果表明:大椭圆轨道像移补偿计算方法正确;动态传函大于0.1,满足动态传函不小于0.1的指标要求;像移匹配(Modulation transfer function, MTF)最小值为0.953,满足不低于0.95的指标要求。
In order to realize high-quality imaging of the Mars surface by the Tianwen-1 high-resolution camera in large elliptical orbit, a large elliptical orbit image motion calculation model based on Mars is established. The calculation method of the large elliptical orbit and image motion is studied. First, according to the characteristics of the large elliptical orbit, the difference between the large elliptical orbit and a near circular orbit is analyzed. Then, the distance from the high-resolution camera to the center of Mars, the orbital velocity of elliptical motion, and the angle between orbital velocity and centrifugal velocity are calculated according to the characteristics of the ellipse and the conservation principle of angular momentum. Then, according to the method of homogeneous coordinate transformation, the Mars scenic spot coordinate system is connected with the high-resolution camera coordinate system, and the image motion velocity is obtained by deriving the position relationship. Finally, the correctness of the image motion compensation calculation method and its influence on image quality are verified through a dynamic imaging experiment. The experimental results show that: the calculation method of image motion compensation for large elliptical orbit is correct; the dynamic transfer function is greater than 0.1, and the dynamic transfer function is not less than 0.1; and the minimum value of image motion matching MTF (Modulation transfer function) is 0.953, which meets the requirement of no less than 0.95.
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