Variable structure control of radar servo system based on IMM

The interacting multiple model(IMM) algorithm is mostly applied to state estimation of system whose characteristic changes by time. It's especially fit for the track of maneuvering object. By using the estimation of parameter in object movement, this paper presents variable structure control, based on IMM of servo system tracked by radar. The algorithm filters the controlled input signals, to decrease the noises and to reach the purpose of diminishing the buffeting . By making use of target angular speed and the state of angular acceleration which are estimated by algorithm, the dynamic hysteresis of servo system can be reduced. Simulation results show the effectiveness of the algorithm. And in practical engineering application, it has achieved good control.