Research On The Influence Of Laser Angle Deception And High PRF Compound Jamming On Laser Guidance System

Laser guided missile has become one of the commonly used precision guided weapons in modern warfare because of its high precision and low cost.During combat,key protected targets such as command posts and artillery positions often use laser angle deception or high repetition frequency laser jamming to protect themselves.The research on single angle deception jamming or single high repetition frequency jamming is a hot spot at present,but the research on the influence of angle deception and high repetition frequency combined jamming on laser guidance system has not been publicly reported,so it is of great theoretical significance to carry out this work.Based on the research background of laser angle deception and self-defense of the target threatened by laser-guided missiles,this paper analyzes the jamming effect of complex jamming on laser-guided missiles.The main contents are as follows:（1）Establishment of laser guidance system model: the common coordinate system and the conversion relationship between coordinate systems are established;The force and moment acting on the missile are analyzed,and the missile motion equations and missile guidance control model are established.The process of laser energy transmission is analyzed,and the model of laser seeker to calculate the line-of-sight angle of missile and target is established.The application and related parameters of inertial elements and actuators on missile are introduced.（2）In view of the possibility that high repetition frequency（PRF）signals and angle deception signals may appear in the gate at the same time,a compound jamming signal priority algorithm is proposed: when the PRF and angle deception jamming start at the same time,after passing through several gates,as long as the PRF jamming does not fail,the subsequent gates will always receive the PRF jamming signals;When the start time of high repetition frequency jamming is late,even if the early angle deception jamming has been successful,after passing through several wave gates,the subsequent wave gates always receive high repetition frequency jamming signals.The algorithm shows that the angle deception jamming signal will not affect the high repetition frequency jamming signal.Through parameter comparison simulation,it is concluded that increasing the precision of angle deception jamming signal and the pulse frequency of high repetition rate laser will increase the probability of high repetition rate jamming in compound jamming,which provides a reference for parameter configuration of compound jamming system.（3）Firstly,the trajectory simulation is carried out without interference.Secondly,the trajectory simulation is carried out under the conditions of single angle deception jamming and single high repetition frequency jamming,and the simulation results show that single jamming mode can effectively realize target protection.Finally,the laser angle deception jamming and high repetition rate composite jamming are simulated in the following three situations: 1)Both high repetition rate jamming and angle deception jamming work normally,and the simulation results are the same as those of high repetition rate single jamming;2)The early high repetition frequency jamming is normal,and the later only angle deception jamming is normal.The simulation result shows that even if the high repetition frequency fails very early,only angle deception jamming can achieve target protection;3)The angle deception jamming is normal in the early stage,and the high repetition frequency jamming is normal in the later stage.The simulation results show that the earlier the high repetition frequency jamming is normal,the earlier the missile switches to inertial guidance or keeps flying in the current state,which is beneficial to protecting the target.Generally speaking,the single laser guided missile using laser angle deception jamming and high repetition frequency jamming can achieve the goal of protecting the real target even if the high repetition frequency jamming fails later or the high repetition frequency jamming starts later.（4）A set of hardware-in-the-loop simulation system is designed for the laser guided missile with laser angle deception and high repetition rate compound jamming,and the mathematical model of laser seeker and compound jamming signal model are added to the real-time simulation calculation part,and the digital real-time simulation of compound jamming trajectory is carried out,and the simulation results are the same as those of mathematical simulation.This shows that the real-time simulation system can be directly used when building a complete hardware-in-the-loop simulation system of compound jamming in the future.The research results of this paper can be used to guide the defense side to deal with the threat of laser guided missiles by using laser angle deception and high repetition frequency compound jamming,which lays a theoretical foundation for further practical application.