基于高速面阵像机扫描成像的弹丸攻角测量方法

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

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 000m/s的目标测试,攻角测量精度优于0.1°。

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 2Dattack 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 the3 Dattack 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 000m/s,the accuracy is better than 0.1°.