Slide Mode Guidance of Infrared Missile Based on IMM_UKF

Aiming at tracking target problem of infrared air-to-air missile during the terminal guidance,it is presented to combine the interacting multi model algorithm and unscented Kalman filter to estimate the state of the target and to improve the observability of the target by designing slide model guidance law at the same time to promote the precision of the missile.Simulation shows that IMM_UKF is better than adaptive two-step filter(ATSF) under the same observability.And it is more precise to combine them and to decrease the undershoot.