The invention relates to the technical field of photoelectric testing of ballistic parameters outside a
target range, in particular to a time / space domain combined light curtain
projectile identification method for testing the intensity of a high-speed rotating tube gun. The method comprises the following steps of: 1, forming a time / space domain combined light curtain by adopting a six-light curtain array and two
linear array cameras; collecting curtain passing signals when the multiple projectiles pass through the
time domain light curtain, extracting curtain passing time values, and obtaining
projectile images in the two
linear array cameras when the multiple projectiles pass through the
spatial domain light curtain and
time information when the multiple projectiles pass through the
spatial domain light curtain; and acquiring the number of
projectile shadows at the same moment in the projectile image, and calculating the target landing coordinates of the projectile by adopting different methods according to the number of shadows at the same moment. According to the invention, the spatial position of the projectile can be accurately given, the time measurement error is avoided, and the coordinate
measurement precision is higher; the time value output by the
time domain light curtain is more direct and accurate than the time value output by the
time domain light curtain; the airspace light curtain can distinguish the curtain passing states of the multiple projectiles, and the
problem of time value matching when the overlapped projectiles pass through the airspace light curtain is avoided.