Research On Cooperative Guidance With Time Constraints

The enhancement and improvement of modern defense system reduce the success rate of single missile defense and interception,and put forward new requirements for the state estimation of the target,as well as the improvement of maneuvering ability of aircraft.Salvo attack can make up to the obstacle of singer missile by several missiles hit or intercept the target as simultaneously as possible.In this paper,on the basis of the coordinated attack technology and ensure the precision of the miss distance,the guidance law with time constraint is derived from optimal theory in order to control the flight time of missiles.Also considering the maneuvering the target,the guidance law with information prediction is proposed.Then the predictor-observers for guidance law subjected to seeker delay is proposed to compensate the time delay.The specific contents are as follows:(1)To achieve the salvo attack,the time-constraint guidance law of multiple missiles can turn into singer guidance law with constraints when the expected impact-time designed properly.The feedback acceleration command for reducing the miss distance is derives from the optimal method and the additional command is derives from linearization for adjusting the time error.The simulation results show the proposed guidance law can control the flight time effectively.(2)The time control effect decayed when target maneuvering.Considering the features of the guidance law,the prediction of target location can attained based on the motion model of the target.The Interacting Multiple Model method is using to adapt to the complexity of the target movement.The simulation shows the method can improve the time control when the target is maneuvering.(3)The predictor-observers for guidance law is proposed to compensate the time delay.The sequential filtering is adopted to deal with the time delay information.The observer obtain the estimation of the state of system some time before,then through the predictor to achieve the state of system at this time.The simulation shows the method can reduce the impact of the time delay.