Full FPGA tracking control system based on Error-Based Communication Disturbance Observer considering time delay for optical disc system

Currently, a high-precision tracking control system is needed for large-capacity optical disc drive system. This paper proposes a new full field-programmable gate array (FPGA) tracking control system based on an Error-Based Communication Disturbance Observer (ECDOB) with consideration of a time delay of the optical disc drive system. The FPGA control system sometime has a large influence on both the integer time delay and the non-integer time delay of the control system. In order to consider the time delay, this paper reconstructs the feedback control system by using the limited pole placement method. Moreover, this paper proposes a new error based communication disturbance observer. The experimental and numerical simulation results confirm that the tracking performance of proposed system is better than that of conventional feedback control system. In full FPGA tracking control of optical disc systems, the proposed error-based communication disturbance observer based tracking controller exhibits good performance.