Abstract: In consideration of the fact that the current automatic measuring systems for impact coordinates fail to measure the coordinates of simultaneous two-projectile impact on target, a coordinate measuring scheme of simultaneous two-projectile impact on target based on a linear array CCD camera is presented. A high speed linear CCD camera, two different wavelength semiconductor lasers and a projection board are used in the scheme. The detection light screen of CCD camera, the light screen of the two lasers and the projection plane of projection board are placed in a plane. When two projectiles pass through the detection light screen at the same time, they block out partial laser light projected on the projection board and leave their shadows on it, meanwhile the shadows and images of the two projectiles are acquired by the CCD camera. The shadows and images are differentiated to obtain the position coordinates of projected points by using a computer image processing method, and then the coordinates of simultaneous two-projectile impact on target are obtained by a mathematic model based on the principle of straight line inter- section. The measuring principle and formulas are provided, and the measuring error is simulated and an- alyzed. Experimental results show that the error of the actual measurement value and the theoretical anal- ysis are consistent. The measuring principle can be used to successfully measure the coordinate of simul- taneous two-projectile impact on target, and the measuring system based on the measuring principle can be applicable to measure the impact coordinates of projectiles of high RF weapons and multibarrel weapons.

Key words: ordnance science and technology, linear array CCD camera, projectile, vertical target, projectile coordinate