收稿：2017-01-19，
录用：2017-5-20，
纸质出版：2017-09-15
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极轨海洋卫星的时间分辨率低，不能及时感知快速变化的海洋现象及海洋突发事件，因此，发展静止轨道海洋成像辐射计势在必行。静止轨道卫星可以长时间观测指定海域，但是视场小，需要通过二维指向镜等方式扩大卫星的观测区域。本文意在通过提出漏扫判断方法，给出合理的扫描方式，保证高轨面阵扫描无地理信息遗漏。首先，本文在分析二维指向镜成像原理的基础上，给出了指向镜子图像成像特性以及不同方向、大小的电机转角所引入的像面旋转。其次，画出了子图像的边界包络图，直观地给出了扫描角度变化与图像覆盖程度的关系。最后，提出了两种无缝拼接的判断方法：栅格法和几何相交法，栅格法能够判断出图像覆盖次数，几何法速度快、准确度高。实验结果表明应用本文的两种方法得到了不同扫描角度间隔下地球边缘有无漏扫的情况，找到基于本文光学系统、可覆盖全球且无缝拼接图像的最大俯仰、方位转角间隔，为电机转角步距的设置提供理论依据，保证不漏扫的同时提高载荷的时间分辨率。
Geostationary satellites can perform high-frequency observation in the same area of the Earth. To extend the area of observation
we use a two-dimensional pointing mirror combined with a frame sensor. A two-dimensional pointing mirror can acquire image information in a short time
and its small volume and low weight render it an appropriate device loaded on the satellite. However
imaging theory of the pointing mirror indicates that image rotation and non-linear error reduce the geometric accuracy of image and may cause missing scans. To address the problem
we first analyze the imaging characteristics of each slot and calculate the rotation angle. We numerically analyze different types of angular error introduced from pitch and azimuth rotation. Then
we propose a mechanism by which the pointing angle affects image coverage. We provide a flow chart of cover rate analysis and figures showing the cover area of different pointing angles. Boundary diagrams of slots are drawn to display the relationship between angular variations and cover rate. After numerical analysis
we find a better way to observe the Northern Hemisphere. Then
we develop two judging methods of seamless stitching: grid method and geometric intersection method. The grid method is used to grid the pointing plane and label cover time on each grid point
whereas the geometric intersection method is used to determine whether the image information is missing on the basis of intersecting relations of the slot envelope. Different situations of geometric intersection are listed. The two methods are also compared. The grid method can determine the coverage time
and the geometric method has great advantages of speed and accuracy. Finally
the two methods have been used to obtain the cover situation of the edge of the Earth at different scanning angles
to find the maximum pitch and azimuth angle interval of the proposed optical system
which can cover the global area and seamless splicing images. When the point mirror is rotating in azimuth
image rotation is more obvious with an increase in motor angle. When the mirror is rotating in pitch
the rotation angle increases with a decrease in pitch angle. Thus
the relative location of the follow-up optical elements should be considered to obtain a low rotation angle of key observation area. This process provides the theoretical basis for setting the turning step of the motor and ensures that the time resolution of the load is increased without geometric information leakage.
陈强, 胡勇, 巩彩兰, 李志乾, 周颖, 刘银年. 2012. 中波红外图像条纹处理方法. 遥感学报, 16(1): 93–104
Chen Q, Hu Y, Gong C L, Li Z Q, Zhou Y and Liu Y N. 2012. Destriping method for mid-infrared image. Journal of Remote Sensing, 16(1): 93–104 (
Hafez M and Sidler T C. 1999. Fast-steering two-axis tilt mirror for laser pointing and scanning//Proceedings of the SPIE 3834, Microrobotics and Microassembly. Boston, MA, US: SPIE, 3834: 172–181[DOI: 10.1117/12.357822]
Hafez M, Sidler T and Salathé R P. 2003. Study of the beam path distortion profiles generated by a two-axis tilt single-mirror laser scanner. Optical Engineering, 42(4): 1048–1057
惠彬, 裴云天, 王淦泉. 2005. 二维扫描镜扫描特性理论分析. 量子电子学报, 22(5): 810–813
Hui B, Pei Y T and Wang G Q. 2005. Optical analysis of space two-axus scanning mirror. Chinese Journal of Quantum Electronics, 22(5): 810–813 (
李淑英, 周世椿. 2008. 二维指向镜的成像特性分析. 光电工程, 35(5): 17–22
Li S Y and Zhou S C. 2008. Analysis of the imaging characteristics of the two-dimensional pointing mirror. Opto-Electronic Engineering, 35(5): 17–22 (
连铜淑. 1988. 反射棱镜共轭理论: 光学仪器的调整与稳象. 北京: 北京理工大学出版社: 1–3
Lian T S. 1988. Conjugate Theory of Reflecting Prism. Beijing: Beijing Institute of Technology Press: 1–3
Pelsue K. 1983. Precision, post-objective, two-axis, galva-nometer scanning//Proceedings of the SPIE 390, High Speed Read/Write Techniques for Advanced Printing and Data Handling. Los Angeles: SPIE, 390: 70–78 [DOI: 10.1117/12.935036]
孙德新, 王建宇. 2005. 45°镜系统扫描轨迹分析及其对像旋校正的影响. 红外与毫米波学报, 24(1): 19–22
Sun D X and Wang J Y. 2005. Scan track of system using 45° Mirror and its effect on the correction of image rotation. Journal of Infrared and Millimeter Waves, 24(1): 19–22 (
王淦泉, 陈桂林. 2014. 地球同步轨道二维扫描红外成像技术. 红外与激光工程, 43(2): 429–433
Wang G Q and Chen G L. 2014. Two-dimensional scanning infrared imaging technology on geosynchronous orbit. Infrared and Laser Engineering, 43(2): 429–433 (
王武, 洪普, 王波, 余徽. 2015. 二维扫描镜像旋特性分析. 光学与光电技术, 13(2): 82–86
Wang W, Hong P, Wang B and Yu H. 2015. Characteristic analysis of two-dimensional scanning mirror rotating. Optics and Optoelectronic Technology, 13(2): 82–86 (
王昱, 胡国军, 龙辉, 张廷涛. 2012. 特征与错位拟合的CCD图像无缝拼接. 遥感学报, 16(S1): 98–101
Wang Y, Hu G J, Long H and Zhang T T. 2012. CCD image seamless mosaic on characteristic and dislocation fitting. Journal of Remote Sensing, 16(S1): 98–101 (
吴凡, 王大鹏. 2009. 二维指向镜的定域扫描方式的扫描特性分析. 光电技术应用, 24(4): 16–20
Wu F and Wang D P. 2009. Analysis of scanning traces characteristics of the two-axis pointing mirror in the mode of scanning in given area. Electro-Optic Technology Application, 24(4): 16–20 (
杨志卿, 吴登喜, 郑永超. 2004. 二维光学扫描中扫描角度非线性研究. 激光技术, 28(3): 262–265
Yang Z Q, Wu D X and Zheng Y C. 2004. Study of angular non-linearity in 2-D optical scanning. Laser Technology, 28(3): 262–265 (
殷东羽. 2016. 基于数字图像的扫描镜动态精度测量方法研究. 上海: 中国科学院研究生院(上海技术物理研究所): 1–3
Yin D Y. 2016. The Study of the Scan-Mirror’s Dynamic Precision Measuring Method Based on the Digital Imaging Technique. Shanghai: Graduate University of Chinese Academy of Sciences(Shanghai Institute of Technical Physics): 1–3
张锷, 龚惠兴. 1999. 消除45°旋转扫描反射镜像旋转系统的研究及应用. 红外与毫米波学报, 18(2): 125–132
Zhang E and Gong H X. 1999. Research and application of system for offsetting the image rotation from 45° rotating scan mirror. Journal of Infrared and Millimeter Waves, 18(2): 125–132 (
张树青, 张媛, 周程灏, 王治乐. 2014. 星载TDICCD相机方位扫描像移模型研究. 红外与激光工程, 43(6): 1823–1829
Zhang S Q, Zhang Y, Zhou C H and Wang Z L. 2014. Image motion model of azimuthally photography for satellite borne TDICCD camera. Infrared and Laser Engineering, 43(6): 1823–1829 (
周世椿. 2010. 高级红外光电工程导论. 上海: 中国科学院上海技术物理研究所研究生部: 319–328
Zhou S C. 2010. Introduction to Advanced Infrared Optoelectronic Engineering. Shanghai: Shanghai Institute of Technical Physics of the Chinese Academy of Sciences: 319–328
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