Research On Invariableness Altitude Flight Control Technology Of Outboard Decoy Projectile

Implementing outboard interference is one of the most effective ways for ships to deal with anti-ship missile attacks.With the continuous development of missile technology,traditional chaff passive jamming’s has been limited,the outboard maneuverable radar active decoy is the developing direction.The decoy projectile proposed in this paper is a kind of decoy projectile that achieve the task of rapid launch deployment,lateral lowspeed fight on invariableness altitude and radar antenna directional interference,and adapt to some certain wind and sea state environment.Its speed is about 10~20 m s and attack angle is about ~ 0 during laterallowspeed fight,which lead the aerodynamic to be useless.Finally,the decoy use itself controlling power.The main research contents are as follows:(1)A method of momentum exchange control is proposed for rolling channel.The thrust vector technique is useed to adjust the thrust and side thrust for the pitch channel,the yaw channel and altitude controlling.As a result,the overall layout and control method of the decoy projectile are determined.(2)The dynamic and kinematic equations of centroid movement,the dynamic and kinematic equations of rotation around the center of mass are deduced in the ground coordinate.The six-degree-freedom dynamic model of the decoy projectile is established.(3)To make sure that the rader jammers in the scope of missile’s beam angle and achieve active decoying,the control method of roll channel is momentum.According to the established control model and the designed control law,some simulations have been conducted,under the disturbance or without disturbance.To verify if the designed control method can work effectively and accurately,we set up the experimental system and carried out the step response experiment and the sine signal tracking experiment.(4)According to the established dynamic model and the designed PID cascade control law,some simulations have been conducted,under the disturbance or no disturbance.(5)According to the results of semi-physical simulation optimized the control parameters.Beased on the optimized results and control law,the decoy projectile can fly smoothly by flight test.To verify if the designed control law can work effectively and accurately.