Abstract:The antagonism against the radar stopping radiating is a key and tough problem to Anti- Radiation Missiles(ARM). Aiming at the scheme of antagonism against the radar stopping radiating based on target state estimation, the adaptive Unscented Kalman Filter(UKF) is applied to the measure against the radar stopping radiating. The EKF/UKF and the adaptive UKF algorithms are used in the simulation for anti-radiation missile against the switching-off. The results indicate that the adaptive UKF is obviously superior to other algorithms against short time switching-off of the radar. For the case of long time switching-off of the radar, other measures against the radar stopping radiating should be considered.