Design Of Space-time Combined Projection Screen And Signal Time Synchronization Technology

Projectile velocity is a fundamental parameter for measuring weapon performance and is an essential test parameter in firing range tests.The four-barrel electromagnetic railgun utilizes powerful electromagnetic force to accelerate projectiles,with all four barrels being able to fire simultaneously,effectively improving the firing efficiency.Existing speed measurement devices such as sky-screen targets and light-screen targets can only measure the speed of one projectile at a time.When multiple projectiles are fired simultaneously,the spatial overlap makes it impossible to effectively distinguish the signals of each projectile passing through the screens.To address this issue,this paper designs a spatiotemporal combined light-screen that can differentiate the passing time signals and spatial positions of four projectiles.The main research contents and achievements are as follows:(1)Research on the measurement method of projectile flight parameters for four-barrel simultaneous firing weapons.According to the firing characteristics and trajectory flight laws of four-barrel simultaneous firing weapons,a spatiotemporal combined light-screen is designed,which can simultaneously detect and effectively distinguish the passing signals of 4 projectiles.(2)Design of dual-field time light-screen detector.Two dual-field time light-screen detectors are placed crosswise,forming 4 independent time light-screens in space,which can simultaneously detect the passing time signals of 4 projectiles.The projectile flight speed is measured using a data acquisition card to collect signals and applying the principle of sectional speed measurement.The frequency characteristics of projectile passing signals are analyzed,and the signal processing circuit of the dual-field time light-screen detector is designed.(3)Construct a spatial position light-screen using a linear array camera.This can detect the relative positions of 4 projectiles in space and determining whether the projectiles have passed through the pre-aimed time light-screens.Due to the inherent delay time of the image acquisition card of the linear array camera,a dual-channel delay compensation circuit is designed to delay the external trigger signal of the data acquisition card,unifying the actual start acquisition time of the data acquisition card and image acquisition card,and synchronizing the projectile passing signals and projectile image signals on the time axis,providing a technical foundation for multi-target recognition and matching.(4)Test and verification of various parameters of the spatiotemporal combined light-screen.Measure the self-delay time of the image acquisition card,and test and verify the detection performance of the dual-field time light-screen detector and the signal time synchronization deviation of the dual-channel delay compensation circuit.The results show that the actual detection field of view angle of the dual-field time light-screen detector is 44.7°,the detection sensitivity is 286 times the projectile diameter,and the signal time synchronization deviation of the delay circuit is less than 8.56μs.