Research On Composite Guidance Law Of Underwater High Speed Vehicle

With the development of modern military science and technology,long-range and high-precision become the development trend of the guided weapons in the modern marine war in the 21 st century.The traditional guidance is unable to meet the requirements of modern guided weapons.This paper based on program that underwater high-speed vehicle composite guide of CASC group 803 institute of the eighth,presents a method of tandem composite guide for improving the accuracy and range.Firstly,in order to avoid manual operation errors that make the guidance direction away from the target azimuth of the next time,the paper apply anti-jamming capability of fuzzy control theory in order to optimize the traditional initial guidance law to propose a fuzzy guidance law.The azimuth error rate of the torpedo and the target and the difference between the favourable azimuth of torpedo and the target azimuth are taken as the fuzzy controller input and the amount of change in the torpedo heading is taken as output.It take mamdani inference algorithm,and use the center of gravity method to defuzzification.The guidance law with high precision,anti-interference ability can adapt to the target maneuver and avoid manual intervention.Secondly,for the different terminal constraints of the terminal guidance system,two kinds of variable structure final guidance laws are proposed by using nonlinear control theory in this paper based on the relative motion between two-dimensional torpedo and target.The first one apply the stability of finite-time theory to propose a variable structure final guidance law with line-of-sight angular rate converging to zero in a limited time and prove that the guidance law can make the line-of-sight angular rate converge to zero before the target is hit.The guidance law is robust and adapts to the target maneuver.The second one apply sliding mode variable structure control theory to propose the final guidance law with the attack angle constraints by adaptive approach law.It transforme the desired attack angle constraint into the desired terminal line-of-sight constraint,and prove the reachability of the variable structure guidance law through the Lyapunos stability principle.Considering the relationship between the torpedo and the target's relative motion in the three-dimensional model,the three-dimensional finite-time convergence guide law is proposed.With the analysis and research of the tactics of handing over and taking over the underwater guidance method,an adaptive handover algorithm is selected though using the sinusoidal transition operator to optimize.Finally taking a yaw system as an example,according to whether the target is for rapid maneuvering the initial guidance simulation,the final guidance simulation and the full composite guidance simulation are carried out.The guidance performance such as the interception time,the attack angle and the miss distance meet the guidance requirements and indicate that the proposed guidance law is feasible and effective.