Measurement principle of six-light-screen vertical target based on sky screen

In order to measure the projectile velocity and the target coordinates in any incident direction simultaneously, a concept of six-light-screen vertical targets based on sky screen was presented. Six detection screens were formed in space by six sky screens. When the projectile passed through the six screens in turn at an angle, the time intervals of projectile passing through the six screens were measured by the signal acquisition and processing system. The projectile velocity，incident angle and target coordinates were calculated according to the intervals and structural parameters. The measurement principle and the formulas were given, and the measurement error was analyzed. The results show that the concept is precise and easy to be engineer implemented.