Abstract: Six-light-screen vertical target is an important equipment for the coordinate measurement of rapid-fire weapons. Since the measurement uncertainty analysis based on an ideal model cannot meet the requirement of engineering practice, the coordinate measurement uncertainty of double N-shaped six-light-screen array was considered in the engineering model. All the factors, such as the calibration uncertainty of structure parameters, the measurement uncertainties of target distance and height difference, the time extraction uncertainty, the uncertainty of light-screen verticality, the placement uncertainty of vertical target and the projectile incident angle, etc., are analyzed, respectively. The influence of each factor is evaluated by establishing evaluation function. The synthetic uncertainty is calculated, and the maximum distribution of measurement uncertainty in 1 m×1 m target area is simulated. The results show that the experimental results of live ammunition are in well agreement with the analyzed results. Key

Key words: rapid-fireweapon, photoelectricmeasurement, six-light-screenarray, coordinatemeasurement, uncertainlyanalysis