Analysis of the shock wave's influence on the prepositional laser fuse's optical path

Pulsed infrared lasers launched by the prepositional laser fuse system reach the target firstly. Laser echo pulses then arrive at the surface of photodiode laser detection receiver, and pass through the boundary layer-shear layer-shock wave-atmosphere-shock wave-shear layer-boundary layer under supersonic velocity, then focuses on the photosensitive surface. As shock waves have an effect on the prepositional laser fuse in the optical path, the great deviation has been brought between distance determining methods on static state and in the course of the actual flight. In this paper, a model of the shock wave's influence on the prepositional laser fuse's optical path under supersonic velocity was presented. Based on a certain projectile, the optical path difference was analyzed. The differences under different projectile velocities were figured out with the Matlab software, which would provide a feasible error analysis method for the exploration of laser fuse or laser weapon under supersonic velocity.