Estimation Of Slope Error Of Radar Seeker Radome For Moving Target Tracking

The military science and technology development of various countries is advancing by leaps and bounds.The earlier combat model that relied on pure firepower no longer meets the requirements of contemporary combat.Precision strikes have gradually become an important method of combat.The importance of precision combat has made missiles gradually attracted attention from various countries.Research is also constantly improving.This article takes the radar seeker for target tracking and transmits the information to the missile guidance system for guidance as the background.Aiming at the radome error slope caused by the seeker radome’s own structure and environment and other force majeure factors,the missile misses the target increase.,A problem that seriously affects the guidance and control system of the missile.Based on the extended Kalman filter,while considering the slope of the radome error and the line-of-sight angular rate,a joint estimated Kalman filter is designed on this basis,and the target method is further estimated.Acceleration in order to get better tracking effect.In this paper,the causes and influencing factors of radome error are described firstly,and then the influence of radome error on the control system is explored.Then the relative motion model of target missile and the measurement model of seeker are established based on the proportional guidance law in polar coordinate system.Then,the target missile motion model considering the radome error slope is established for the fixed target and the moving target on the water surface.Because the measurement model of the seeker is nonlinear,it is necessary to demonstrate the observability of the model first.Then based on the principle of extended Kalman filter,first design the Kalman filter for the fixed target to estimate the radome error slope and the line-of-sight angular rate.Then it can be seen from the simulation data and images that the line-of-sight angular rate and the radome error slope are estimated at the same time.The compensation method has a mediocre effect on the error slope of the radome,and has a mediocre effect on the tracking of the line-of-sight angular rate,and it does not improve the performance of the guidance and control system well.Regarding the moving target,the target acceleration estimation and the target acceleration estimation are not considered respectively,and the extended Kalman filter is designed considering the joint estimation of the radome error slope and the line-of-sight angular rate,and the target acceleration estimation is considered to make the model closer to the actual model.Can obtain better compensation and guidance effect.From the simulation results,it can be seen that the compensation method considering the target acceleration estimation has improved the compensation effect of the radome error slope,the line-of-sight angular rate tracking effect has also been improved,and the performance of the guidance an d control system has also been improved.Effectiveness of the method.