Guidance law designing for air-based interception of ballistic missiles in the boost phase

In this paper,a design method for air-based boost-phase missile interception mid-course guidance law is presented under the case of less available target information.First,under full consideration of the characteristics of air-based boost-phase missile interception and the parallel approach method,the problem of how to design the mid-guidance law is converted into problem of how to make the relative height between missile and the target in the vertical plane tend to and keep zero,and the input-output model is established.Second,the automatic disturbance rejection controller(ADRC) is used to estimate and compensate for the uncertainty of the model which is caused by less available target information,and the necessary instructions for interception are obtained.The adjustment method for some of the parameters is briefly introduced in the designing process of the ADRC.Finally,the feasibility of the guidance law described in this paper is verified through simulation.