Research On Digital Control Of Upper Reflector Aim-Stabilization System

With electron technology's fast developing, the electron-integrated system is being formed on the modern tanks to share information in the whole system. As one of important parts of the tank fire control system, the digital design of the upper reflector aim-stabilization system is especially important.After the introduction of two parts, which the system makes up of, including measure groupware and control combination, the system's work theories in reticle-setting and image-stabilization modes are explained. The key parts in signal collection and pretreatment are discussed. On the basic of system's model, the closed loops such as gyro rebalance, system in reticle-setting mode and system in image-stabilization mode, have been researched using classical PID control theory according to requirements. Through 'tustin' transforming, the digital controllers have been achieved. For system in reticle-setting mode, the velocity-closed loop is added to increase damp and decrease peak overshoot. For system in image-stabilization mode, the sliding mode variable structure controller has been designed to improve system's ability of disturbance. The simulation results show its advantage.The core of hardware circuit is a DSP chip– TMS320F2812 made by TI Company. This microprocessor is based upon TMS320C2xx core and is one of the most advanced 32 bits fixed-point DSP chips. It integrates much peripheral equipment and provides a good platform for motor application. The hardware circuit and software flow chart, relative to DSP, are designed.The experiment results of system are showed in the end of the paper, including swing, vibration and impulsion experiments. The test data proved the correctness of design idea and practicality of digital control system.