针对双弹丸同时着靶情况下的立靶坐标测量问题，提出一种圆形阵列光电探测系统的双目标识别方法。采用光电探测器件组成1个圆形的探测阵列，并将3个发光角度均为60°的扇形一字线激光器均匀设置于圆形探测阵列上组成探测光幕。当2发弹丸同时穿过探测光幕时，会在圆形探测阵列上产生6个弹丸投影，通过信号处理电路识别6个弹丸投影的中心位置，最后通过系统弹丸着靶坐标测量公式计算得到2发弹丸的着靶坐标。在对系统测量原理进行论述的基础上，建立了系统的弹丸着靶坐标测量模型，并对坐标测量误差进行了分析和仿真。仿真结果显示，系统在测量靶面为1 m×1 m时的X坐标测量误差标准差最大为2.7 mm，Y坐标测量误差标准差最大为0.6 mm。实验结果表明，系统在测量靶面为1 m×1 m时的X坐标测量误差标准差为2.22 mm，Y坐标测量误差标准差为1.98 mm。因此，该文所提出的系统可以有效测量弹径4.5 mm及其以上的双弹丸着靶坐标。

Aiming at the problem of vertical target coordinate measurement when two projectors were touching the target at the same time, a two-target identification method of circular array photoelectric detection system was proposed. A circular detection array was formed by using photodetectors, and three fan-shaped linear lasers with all luminescence angles of 60° were uniformly arranged on circular detection array to form a detection light curtain. When the two projectiles passed through detection light screen at the same time, six projectiles would be generated on the circular detection array. The central position of the six projectiles would be identified through the signal processing circuit. Finally, the target coordinates of two projectiles would be calculated by system projectile hitting coordinate measurement formula. On the basis of the theory of system measurement, the coordinate measurement model of the projectile hitting target was established, and the coordinate measurement error was analyzed and simulated. The simulation results show that the maximum standard deviation of the X coordinate measurement error is 2.7 mm and the maximum standard deviation of the Y coordinate measurement error is 0.6 mm when the target surface is 1 m×1 m. The experimental results show that the standard deviation of X coordinate measurement error is 2.22 mm and Y coordinate measurement error is 1.98 mm when the target surface is 1 m×1 m. Therefore, the system proposed can effectively measure the target coordinates of double projectors with a projectile diameter of 4.5 mm or above.