Dynamic Scanning Array Projectile Coordinate And Velocity Testing System

In weapon development,projectile velocity and impact point coordinate are two important parameters to measure weapon performance.Projectile velocity detection is to measure the effective lethality of the weapon,projectile impact point detection is to measure the shooting accuracy of the weapon and the density of the impact point distribution.In order to effectively intercept and destroy a target,it is necessary to know the velocity of the projectile and the spread of the drop point.At present,most weapon testing methods only involve the coordinate testing of weapons or only involve the velocity testing of weapons.Only a few testing methods can involve the velocity and coordinate testing of projectiles at the same time.In this paper,the dynamic scanning mode of LED diode is proposed.The array composed of multiple infrared light-emitting tubes with equal spacing is used as the light-emitting array and the array composed of multiple photodiodes with equal spacing is used as the detection array.The light-emitting array and the detection array are staggered to form the coordinate target of the photoelectric array seamlessly.The target surface of the system lights up the infrared light-emitting tube and the gating photodiode successively and presents a dynamic scanning state successively.When the projectile passes through the target surface,the corresponding light beam is blocked to generate the signal of crossing the target,so as to measure the coordinates of the projectile’s impact point and the speed of crossing the target.The measurement method using LED diode dynamic scanning synthesises the advantages of combined optical curtain target and velocity measurement target,and solves the problems of low detection accuracy,uneven optical curtain,complex structure,easy overlap of target surface stitching and difficulty of velocity measurement in combined optical curtain target.Through the FPGA chip of XILINX Company,72 data buses and 8 control buses are realized to receive and control system signals.The STM32 main control chip is transplanted to UCOSIII operating system,which solves complex front and back operations by task scheduling.The photodiode signal adjusting circuit is designed to improve the stability of the system and reduce the probability of false trigger.The system reduces the missed target rate of the projectile when it crosses the target by the method of one-to-many scanning.The velocity correction algorithm is designed to correct the velocity of the projectile when it crosses the target oblique.In this paper,the target surface and hardware design of the system are given.Through the analysis of the optical curtain structure and the single point scanning test,the target surface with a target distance of 520 mm is formed by the emission array or detection array containing 8 photoelectric components.The control circuit and signal conditioning circuit of the infrared light-emitting tube and photoelectric secondary tube are designed and analyzed in detail.Finally,it is verified by experiments that the system can meet the test of the coordinates of the projectile impact point and the velocity of the projectile when the velocity of the projectile is less than or equal to1500m/s when the single point scanning frequency is 200 KHz.