DSP Based Control Platform For Laser Beam Tracking

Stability of the laser beam technology is widely used in aircraft targeting, monitoring, and free space laser-based communications. Targeting is a typical laser beam stabilization applications. In most cases, the object's position change with time, which requires the laser beam is capable of tracking the targets quickly and precisely. In order to simulate the whole working process, we developed a laser platform for research in this paper.Based on the analysis of the literature, the mechanical design of the system is given and the real-time analysis also is presented. In accordance with the results of real-time analysis, the necessary functions of the control system and the proper system components such as sensors, actuators and control module are determined. Then, the control module is chosen and closed loop system is constructed. This is followed by introduction of the working principle of sensor and the design of signal acquisition circuit of the sensor. Next, the concerning performances of voice coil actuator are analyzed, and the mathematical model of the voice coil actuator is established in terms of its characteristics. As the voice coil motor mathematical model is a typical second-order system, so PID control law is chosen, and then experiments aiming to test the rationality of design of the tracking control platform are implemented. Then other control approaches based on modern control theory, State Observer and Pole Placement also are introduced and executed on real experimental system.Subsequently, the control module and the drive circuit between the implementing agencies have been designed, and the driving principle of the circuit has been shown. After finishing the design of the peripheral circuits, the mathematical model of the DSP chip TMS320C2812 is formulated, which focuses on detailed DSP built-in ADC module and the PWM output module works, and gives the internal realization of the DSP ADC and PWM output of the program flowchart.In the end PID controller and State Observer and Pole Placement controller are executed on real experimental system, and their efficiency in accuracy and quickness is well proved by results. By compared with the product of QUANSER, the future work has been introduced.