Influence of radar seeker disturbance rejection rate with radome error and on-line compensation with UKF

For the heavy impacts of radar seeker disturbance rejection rate on missile guidance and control system, a disturbance rejection rate model of radar seeker was established considering radome error. The stability and time-frequency domain performance of parasitic loop caused by spring torque, damping torque and radome error were comparatively analyzed based on the model. Analyzing the relationship between miss distance and disturbance rejection rate under different interferences, an on-line compensation method was proposed with unscented Kalman filter (UKF), and was validated with simulation. The research results show that, the disturbance rejection rate of radar seeker can weaken the stability and guidance accuracy of the guidance system, and the infection of negative radome error slope is the most serious. With glint noise, miss distance caused by negative radome error slope and spring torque is larger, while with random target maneuver, the miss distance caused by positive and negative radome error slope is larger. The UKF on-line compensation method can estimate the coefficient of spring torque and damping torque and the radome error slope with velocity pointing error and constant target maneuver. The disturbance rejection rate can be controlled effectively, the stability and performance of guidance system are improved with the compensation.