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.