Research On Precision Hit Control Method Of Damage Element In The Condition Of Attitude Disturbance

On the basis of flying far enough and hitting the target accurately and strongly,smart ammunition is heading for destroying the target skillfully.The destroying elements are concentrated on a specific range,pointing at the vulnerable parts of targets.This paper is based on cruise missiles,one of the typical smart ammunitions.The hit precision is determined by encounter trajectory and rendezvous attitude.Therefore,with the condition of attitude disturbance,the control method research is proposed.The main research contents are as follows:Because the traditional uniform straight line rendezvous model can not describe the relative maneuver of ammunition and target in the process of missile and target rendezvous.A parameter prediction model for the trajectory of the projectile rendezvous is proposed,using terminal guidance information.Detonating control algorithm is built.Taking the attack process of the ground armor target with a small cruise missile with the EFP warhead for example,to verify the precision of detonation control algorithm by computer simulation.And the result is the precision of prediction model is much higer than traditional uniform straight line model.To solve the problem the hit precision is determined by of the missile and target encounter trajectory and rendezvous attitude,attitude mathematical model of missile and target intersection is proposed.With the condition of small angles,the model is simplified.A calculation formula of point coordinates of damage element is established.Decoupling the axial and lateral deviations from the hit of the damage element.It is concluded that the axial deviation of the damage element can be adjusted by the initiation time,and the crosswise deviation should be matched by the trajectory of the intersection of the projectile and the intersection with the intersection attitude.Taking the attitude of the projectile and the target intersection into the calculation of the initiation time,and building up the correction formula of initiation time.The constraint conditions for the accurate hit of the damage element are set,which lays the foundation for the guidance law research and the selection and optimization of virtual target location for the precise hit of damage element.In order to meet the requirements of the precise hit of the damage element to the trajectory of the rendezvous and the condition of the rendezvous,the basic idea of "model prediction-rolling optimization-feedback correction" in the predictive control method is absorbed in this paper to design of terminal constraint guidance law based on virtual target.The method of primary selection and correction of virtual target position which satisfies the precise hit constraint of damage element is studied.The pursuit model between the ammunition and the real target and the virtual target is established.Design the guidance law to combat virtual targets separately in vertical and horizontal planes.Taking the attack process of the ground armor target with a small cruise missile with the EFP warhead for example,to verify the guidance law by computer simulation.The results show that the guidance law can provide good trajectory and intersection attitude for the accurate hit of the damage element.Taking the attack process of the ground armor target with a small cruise missile with the EFP warhead for example,the probability of single hit of damage element is simulated by computer.The results show that combining the detonation control algorithm based on the identification of missile and intersection trajectory and the correction formula based on the initiation time of intersection,the accuracy of hit accuracy can be improved.Furthermore,the above detonation control algorithm is combined with the terminal constraint guidance law facing the damage target,and the hit accuracy of the damage element can be improved through the prediction of the terminal trajectory and the location of the virtual target.