基于高速面阵像机扫描成像的弹丸攻角测量方法

攻角是指飞行中弹丸的轴线与其质心运动方向的夹角，是描述弹丸飞行姿态的重要参数，以往都是采用狭缝相机来进行测量。提出了一种基于高速面阵像机测量弹丸攻角的方法。该方法是从面阵序列图像每帧中提取出固定列像元，然后按时序拼接形成一幅图像，等同于线阵扫描的图像；对于扫描速度同影像运动速度不同步时，建立了攻角计算修正模型。采用2台像机从非正交方向进行拍摄，基于面面交会原理，得到三维攻角。实测结果表明:该方法能完成弹速达到1 000 m/s的目标测试，攻角测量精度优于0.1。

Measurement of attack angle with high-speed area array camera based on scanning image

The attack angle of projectile,which is an important parameter to describe the flying attitude, refers to the angle between victory and axis.The measurement of three-dimensional attack angle, an important part in conventional weapon test, aims to analyze the validity and stability of the projectile and provides a vital basis for the evaluation of the weapon system performance.The traditional method is to use a slit camera on the synchronous scan mode(the speed of film is equal to the speed of target image). We proposed a measurement method of the attack angle based on scanning image of high-speed area array camera. The principle is as follows: A scan image is formed through extracting a fixed column of per frame and stitching the pixels sequentially;By interpreting the feature points, the 2D attack angle is obtained; Aiming at the problem that the scanning speed isn-t up to the film speed, the attack angle correction model and scanning image restoration method were built.Furthermore, we proposed a method of two cameras shooting from non-orthogonal directions to get the 3D attack angle, based on the surface-surface intersection theory. The experimental results show that this method can measure the attack angle of the targets under 1 000 m/s, the accuracy is better than 0.1.