利用线阵像机实现弹丸运动参数测量

现代靶场中主要采用狭缝摄影技术测量弹丸出膛后的速度、攻角和转速等运动参数,近些年来,采用数字线阵像机代替传统的胶片式相机是目前狭缝摄影的研究方向。对此,本文设计了一种单台线阵像机配合双像器实现等效双像机正交交会测量弹丸的系统,并根据弹丸目标的外形特点,构建了利用圆柱数学模型的弹丸运动参数最优化模型,通过优化算法进行模型求解获得弹丸方位、速度参数,进而求取攻角;设计了一种新的标记线方法,可简单精确地计算弹丸转速。通过仿真实验,验证了本文提出的参数估计方法的精确性。

Measuring motion parameters of projectile using line scan camera

The streak photography is mainly used for measuring the projectile’s velocity,angle of attack,and spin rate in modern Test Range.In recent years,attempts were made to substitute the traditional film camera with the line scan camera.To solve the problem,an equivalent ortho-intersection photography using a single line scan camera and a mirror was developed in this paper.Due to the shape characteristic of the projectile,an optimization model of motion parameters using cylinder model was established.Optimization algorithm was used to converge toward optimal solutions of the position,attitude and the velocity,and the angle of attack was then computed;a mark method was adapted to measure the spin rate simply and accurately.Experiment validated the precision of the method with simulated data.