Modeling and analysis of servo system on countermeasure of IR imaging seeker

Infrared imaging guidance weapon countermeasure was the important fields of opto-electronic countermeasures. The detector of IR imaging seeker was replaced by image emulation and injection computer in the hardware-in-the-loop simulation test of digital image injection, it was necessary to consider the equivalence of control capability for the servo system under the simulation test and actual conditions by means of building the accurate transfer function of servo system for the IR imaging seeker. Based on this, the entire servo system of the seeker was divided into seven different function module according to the configuration of the seeker, and the total design method about the modeling of the servo system was proposed. Then the integrated mathematic model of the servo system was set up by adopting the mechanism modeling combined with the experimental test method. Light axis of the seeker remained in a state of stabilization with 5 amplitude and 2 Hz disturbing of bomb. Line of sight and line of sight velocity between target and bomb of simulation output could precisely track the actual line of sight and line of sight velocity by testing the model. Simulation analysis validates the correctness of the model of the servo control system. The results of research provide theoretical method support for the modeling of the servo control system for the same type device, and also give the model for the feasibility of the new digital image injection simulation test on the infrared imaging guidance weapon.