| Due to the capability of advanced auto-targeting, hypervelocity, rapid response and the characteristics of accurate target-tracking and implement interception, Kinetic Kill Vehicles(KKV) has become to the most advanced representative of intercept missiles. The control system of KKV is the key aspect for striking target accurately. Based on the current control methods of the interceptor, a kind of hybrid control methods and strategies based on pulse-width modulation(PWM) and Smit modulation was proposed. The guidance precision and the dynamic performance were improved.Firstly, the dynamics and kinematics, thruster, seeker, atmospheric and other mathematical models of interceptors were established. The required bias model for future guidance and control systems’ verification was established too. Further study of the guide rail control instruction with a filter was generated, which technique has always been used to protect the interceptor at the target and has a good range of fault-tolerant attitude control guide instruction. The traditional attitude controller accordance with the classical control theory was designed. In order to get the linear model, the Small Perturbations Linearization Method was applied. On this basis, the RCS attitude controllers pulse-width modulation and Smit attitude controller have been established. And through simulating, the effectiveness and characteristics of the three controllers were demonstrated.Finally, in order to obtain the effectiveness of the interceptor’s accuracy, the main factors affecting the interceptor process were simulated. Factors considered including: implementation structure, steady thrust deviation, engine thrust eccentric, centroid shifting, the sensor measurement error, seeker measurement error factors, errors and other atmospheric factors. The impact of these factors on each needle interceptors effects were simulated and analyzed. The simulation results verified the effectiveness of the control methods and strategies. |
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