Real-Time Disturbance Rejection Based on FPGA-Enabled Fast Frequency Estimation for Optical Axis Position System

作者：Yepan Li, Kai Chao, Hu Yang, Tao Tang · 发表于：IEEE transactions on consumer electronics · 年份：2026 · DOI：10.1109/TCE.2025.3645052 · 研究领域：Computer Science

Optical axis position systems are widely used in fields such as optoelectronic tracking, chip manufacturing, and hard disk drive control. These fields play key roles in improving the performance and functionality of consumer electronics. This paper proposes a new control method enabled by a Field-Programmable Gate Array (FPGA) to reject dynamic disturbances across the full frequency band for an optical axis position system, which relaxes the restrictions on time consumption. The method proposed in this paper effectively combines the error observer and a frequency estimation algorithm. A new frequency estimation algorithm based on FPGA is proposed to adjust the parameters of the error-based observer, which improves the efficiency of generating adaptive parameters. Parallel and serial processing structures are combined to improve time efficiency and area utilization for implementation in an FPGA. Compared with using a DSP, implementing the algorithm on an FPGA enables real-time performance for high sampling frequency applications. To achieve disturbance rejection across the full frequency band, delay compensation and multi-rate control are used to adjust the error observer. The experimental results show that the proposed FPGA-enabled method accurately estimates the frequencies of time-varying disturbances consisting of narrow-band sinusoidal disturbances, and effectively rejects full-band disturbances.