This paper aims to design an autopilot system for a ballistic missile; vanguard missile based on the lead compensation technique. The control method is used to adjust the deflection of the thrust champers of the missile to keeps it in a desired trajectory by stabilizing the system through the increase of the damping ratio of the controllers and proposing an appropriate compensation method for to eliminate the effects of any change or perturbations that may occur to the system. To design the proposed autopilot system, dynamic equations of the missile motion were derived, and the transfer functions for each element involved in the system was set and established, this includes the compensator transfer function. The system was designed and tested to assure that the resultant autopilot system satisfies the requirements of the stability. MATLAB SIMULINK blocks were used to design three different scenarios to evaluate the behavior of the system.

Full text: IJEIR-1403_final.pdf