Research On Laser Warning System Based On Four Quadrant Detector

Laser warning system as an important part of the field of laser confrontation,in the face of threats such as laser rangefinder and laser guidance weapon,it can quickly detect the incoming laser orientation information,and at the same time with sound and light alarm,so that the combatants can take preventive measures against their own military system in time and effectively.In view of the current laser warning system can not take both high precision and large field of view into account simultaneously at the time of detection,based on the working principle of laser warning system,this paper proposed a laser warning system based on four-quadrant detector.The system had the advantages of high precision,omni-directional,real-time alarm and visualization of alarm results.Firstly,on the basis of analyzing the composition and working principle of the laser warning system and comparing the types and characteristics of the existing laser warning system,the overall design scheme of the system was proposed.By comparing three commonly used photoelectric detectors,the four-quadrant detector was selected as the laser positioning detector of the alarm system,and then on this basis,the optical system,signal amplifying circuit,data acquisition circuit,FPGA and MCU main control circuit,human-machine interaction and acousto-optic alarm circuit and the overall system exterior structure design were completed.Secondly,in order to realize the purpose of omni-directional and high precision detection of the system,the encoding detection algorithm and the high-precision localization algorithm were proposed.The encoding detection algorithm was based on the establishment of the encoding detection model in the horizontal direction and the pitch direction of the system respectively,and then the design idea and scheme of the omni-directional detection were expounded.The high-precision positioning algorithm was to simulate the whole positioning process of the incident laser by establishing the photosensitive surface and the light spot model,and the collection of all valid positioning data obtained in this process was used as the information query library to realize high precision positioning.Finally,the system's high precision,omni-directional and real-time alarm and alann visualization were verified through experiments.The experimental results show that the accuracy of the proposed positioning algorithm was higher than the traditional positioning algorithms.There exists a field overlap between the detection channels in the system,which can meet the requirements of realizing the omni-directional detection.The system can realize real-time alarm,and can obtain the related detection information in real time.