Fpga-based Hardware Design of Closed Loop Control for Fiber Optic Gyroscope

The stability, reliability and miniaturization of fiber optic gyroscope (FOG) are always the research focuses and difficulties. This paper presented a hardware design method for the digital closed loop control system of FOG based on FPGA. Based on a large number of experiments, this paper summarized the parameter demands for each module of closed loop control circuit and designed a corresponding hardware circuit using FPGA. The proposed twice closed loop technique improved the zero offset stability of FOG. The using of FPGA brought the digital signal processing by software, the system reliability and agility enhancement as well as the system miniaturization. Particularly, we discussed the problems of component selection and the anti-jamming measures for PCB design to improve the performances of the system. We also developed some samples of FOG using this design method. The experiments and tests show that the proposed method is efficient and valuable. The zero-biases of all samples are all less than 0.075deg/h.