光学精密工程2017，Vol.25Issue(7)：1714-1726,13.DOI:10.3788/OPE.20172507.1714
大角度倾斜成像航空相机对地目标定位
Ground target geo-location using imaging aerial camera with large inclined angles
摘要
Abstract
Aiming at problems that operating range of laser ranging finder limits shooting distance of aerial camera with large inclined angles,a directly target geo-location algorithm independent of ranging equipment was proposed.Based on aircraft positions and attitude information measured by airborne Position and Orientation System (POS),as well as outer and inner gimbal angles from the encoder in the aerial camera,target to sensor vector in Earth-Centered Earth-Fixed (ECEF)coordinate was solved by homogeneous coordinate transformation.Then according to ellipsoidal earth model and global Digital Elevation Model (DEM),the longitude and latitude of the target were determined.The Monte Carlo method was employed for simulated analysis on influences of measurement errors of aircraft position and altitude as well as encoder on pointing accuracy of Line of Sight (LOS).Compared with the geo-location algorithm which only based on ellipsoidal earth model,the algorithm effectively reduced the influence of uneven terrain on target location.When the standard deviation of uneven terrain in the target area is over 10 m,the positioning accuracy of the wide-angle inclined imaging is improved significantly.The flight test proves the feasibility of the target geolocation algorithm,in which the Circular Error Probability(CEP) of the target geo-location is smaller than 70 m when the flight height is 18 000 m and the roll angle of the photography inclination angle is less than 63°.Consequently the proposed algorithm can meet actual demands of the project.关键词
航空相机/目标定位/其次坐标变换/数字高程模型/误差分析Key words
aerial camera/geo-location/homogeneous coordinate transformation/digital elevation model/error analysis分类
航空航天引用本文复制引用
乔川,丁亚林,许永森,修吉宏,杜言鲁..大角度倾斜成像航空相机对地目标定位[J].光学精密工程,2017,25(7):1714-1726,13.基金项目
国家自然科学基金资助项目(No.61405192) （No.61405192）
吉林省科技发展计划资助项目(No.20140520114JH) （No.20140520114JH）
