| With the development of precise guidance technology,guided weapons are pouring into modern warfare.As a kind of guided missile,it has the advantage of passive imaging concealment and it’s easy to use.It is found that the infrared imaging system is extremely vulnerable to laser interference during the imaging process and it will lose the tracking target when interfered,therefore,it is of great significance to study the laser jamming infrared guidance for the attack and defense of weapons.In this paper,the interference mechanism of laser interfering infrared imaging system is studied firstly.The basic guidance model is designed based on the ideal guidance environment.Supported by the above research,the guidance and jamming model in real environment are designed and the jamming simulation under different conditions is realized.Finally,experimental platform is designed to provide basic experimental data for the above modeling simulation and theoretical analysis,the paper also carries out relevant experimental verifications.The experimental platform involves infrared heat source controlling,motion system design,infrared image processing,serial port controlling and other related technologies.The laser interfering infrared guidance mainly makes the seeker unable to locate the target accurately through jamming the imaging system and causes the strike deviation finally.This thesis analyzes the basic imaging principle of infrared imaging system and laser interference sources.The algorithm of tracking target is designed in this paper.Radiation saturation interference and tracking accuracy interference are studied theoretically and the interference principle is verified by combining the data provided by experimental platform.Based on the basic theory of kinematics and dynamics,the initial simulation of the guidance under the ideal environment is carried out,and the change of guidance rate,miss distance and overload after jamming is discussed by the simulation.The guidance model and interference model in real environment are designed after,and the change of missile guidance characteristics after interference in real environment is studied deeply.The experimental platform is designed and the key control technologies are studied,it’s mainly composed of image acquisition and processing system,motion control system,infrared thermal imager,laser controller,shutter,control software and so on.Motion control system meets the requirements that turntable can pitch or rotate between±10°and ± 20°,the error of positioning and verticality are all better than that of 50" in the system.Infrared heat source system meets the requirements that the accuracy of temperature controlling is±0.6℃ and the range is from room temperature to 100℃.The image processing system realizes the acquisition rate of 100 frames/s and the processing rate of 5 frames/s.System software completes the hardware system controlling and data storage or processing.The turntable accuracy,temperature control accuracy,image acquisition rate and accuracy of the experimental platform are systematically tested and analyzed in the thesis.A group of laser jamming infrared imaging experiments are designed and switching time of the guidance mode under the jamming is written into the simulation model to study the miss distance and the change of guidance trajectory after the jamming. |
