基于构建最优函数提高飞机姿态测量精度

提出了基于构建最优函数来提高飞机姿态测量精度的方法.首先,利用模板匹配法获得飞机在两个测站投影的同名特征点,在发射坐标系下采用交会获得飞机同名特征点的坐标值,根据飞机在空间的特征三角形解算飞机姿态的初值.然后,建立飞机体坐标系；利用成像的共线方程,重新计算空间特征点对应的像点坐标；以重投影结果与实际像点之间的偏差最小作为优化目标函数.最后,通过迭代提高目标姿态解的精度.实验结果表明,飞机轴向成像在大于500pixel时,姿态角测量误差小于0.1°.与中轴线法及飞机角平分线方向向量法测量精度比对,本文提出的方法采用的数学模型正确、算法合理,有效地提高了飞机姿态的测量精度.

Improvement of measurement precision of plane attitude by constructing optimization functions

A method based on optimization functions was proposed to improve the attitude measurement precision of a plane.First,the same feature that the plane was projected at two measuring stations was acquired by the template matching method.The coordinate value of the same feature for the plane was obtained by intersecting at a launching coordinate,and the initial value of the plane attitude was estimated in term of the characteristic triangle of the plane in space.Then,the object coordinate of the plane was established,the image coordinate according to the feature of plane was calculated by using a colinear equation and the least difference between the re-project result and an actual image was regarded as the optimizing goal function.Finally,the iterative method was used to improve the precision of the attitude parameter of a target.Experimental results show that the measuring error of the attitude angle is less than 0.1 ° when the axis of the plane imaging is more than 500 pixels.As compared with the middle axis method and the direction vector method of angle bisector lines,proposed method has a correct mathematical model,reasonable algorithm and can improve effectively the measurement precision of the plane.