Terminal Guidance Characteristic Analysis Of Bias Guidance Based On Adjoint Method

In order to achieve the purpose of the observation target near the leap, proposed the research requirement of bias guidance, according to different index to control the minimum distance between KKV and target, to observe the external structure of target, fault conditions and the state of motion. In this paper, in connection with the terminal guidance problem of bias guidance to complete the following work areas:Firstly, the process of bias guidance is analyzed, the terminal guidance of bias is divided into three sections, the first is proportional navigation section, the second is bias guide section and the third is blind section. The bias guide section is divided into two sections that are passive ranging section and high precision ranging section based on the ranging method. Bias guidance control index is proposed and bias guidance law is designed under the continuous overload based on proportional navigation guidance law. The linear model of the terminal guidance of bias system is given on the basis of missile-target relative speed approximately constant. Based on the terminal guidance characteristics of bias guidance what is missing target in the late, the adjoint method can be extended to study the impact of the original system input to output any time. The model of the terminal guidance of bias adjoint system is builded, and the analytical solutions between the remaining flight time and the bias distance is be solved.Secondly, the required overload of the terminal guidance process of bias is analyzed. Linear fitting form of passive ranging error margin is given, passive ranging error is leaded into the adjoint system, the influence of the ranging error to the bias accuracy is analyzed. High precision ranging conditions and the starting bias conditions are given under ranging error and overload limit.Finally, the noise input of terminal guidance system is analyzed, the expression of stochastic process under adjoint method is given, The model of the terminal guidance of bias adjoint system is builded under stochastic input, the influence of the LOS rate measurement noise and ranging measurement noise to the bias accuracy is analyzed by simulation.