Design Of A Small Volume Laser Synchronous Scanning Peripheral Detection System

The laser panoramic fuze can detect targets within 360° of the projectile,and is widely used in portable interception missiles.The synchronous scanning method is a usual laser panoramic detection scheme,it has the advantages of high energy utilization,low background noise,and high precision,but it is large in size and complex in structure.This paper finished the design of the laser synchronous scanning panoramic detection system with small size and high shock resistance,by the means of parameters optimization design,system simulation and performance testing.Aiming at the detection distance and volume requirements of the panoramic Fuze designing,two small-volume laser synchronous scanning panoramic detection schemes were proposed,and a synchronous scanning scheme based on a scanning motor with double output shafts and multi-stage mirror folding device was determined,the overall scheme design of the laser synchronous scanning panoramic detection system was completed according to the structure and working principle.The echo power model of the laser synchronous scanning panoramic detection system was established for aerial target detection,and the key factors affecting the target echo power were gotton.The best beam divergence angle of the emitted beam was obtained according to the motor scanning speed and the pulsed laser frequency during the process of missile-target intersection,the laser emission and receiving optical path parameters were designed by combining the system structure and detection requirements,and the performance analysis and optimization of the emission and receiving lens were done.The intersection model of emission beams and receiving field was established,and a comprehensiveoptimization algorithm for optical path parameters based on multi-island genetic algorithm was proposed to obtain the best installation angle and size of each mirror.According to the structure of the brushless DC motor,the motor speed regulation principle and the fluctuation characteristics of the speed torque,the motor starting method and the rotor position detection method were determined;A simulation model of the motor double closed-loop control system based on current and speed feedback is established,the best motor control parameters are obtained,the design of the motor control circuit is completed,and the simulation results are verified by experiments.Aiming at the shock resistance requirements of the laser fuze on the portable interceptor missiles,some buffering methods for reduce motor shock were proposed,and the performance of shock resistant was verified by Marshall hammer experiments.A composite time identification method based on threshold method and constant ratio timing method was proposed in this paper,and the hardware circuit of the laser synchronous scanning panoramic detection system is designed.Software design,debugging and prototype assembly were completed,then motor closed-loop speed regulation and high-precision ranging was realized.experiments were carried out to verify the system performance,and the experimental results showed that the laser synchronous scanning panoramic detection system achieved full-circumference,high-precision ranging,moreover,had strong capabilities of anti-electromagnetic interference.