Measurement of attack angle with high-speed area array camera based on scanning image
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摘要: 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。Abstract: 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.
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