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谐振式光纤陀螺(Resonator Fiber Optic Gyro,RFOG)是基于Sagnac效应产生的谐振频率差来测量旋转角速度的一种新型光学传感器,在小型化和集成化方面具有明显优势。相比于传统的模拟检测技术,数字检测技术具有稳定性好、抗干扰能力强、处理速度快和体积小、易于集成等优势。本文设计了基于现场可编程门阵列(Field Programmable Gate Array,FPGA)的数字RFOG系统,在单片FPGA上实现了基于比例积分控制的谐振频率伺服回路、相位调制器复位电压漂移补偿回路和第二闭环反馈控制回路。最后将研制的基于单片FPGA的闭环数字检测电路应用于实际RFOG系统,验证了上述功能,并实际检测了陀螺信号。
Resonator Fiber Optic Gyro (RFOG) is a new type of optical sensor that measures the rotational angular velocity based on the resonant frequency difference caused by the Sagnac effect, and has obvious advantages in miniaturization and integration. Compared with the traditional analog detection technology, digital detection technology has the advantages of good stability, anti-interference ability, processing speed and small size, easy to integrate. In this paper, a digital RFOG system based on Field Programmable Gate Array (FPGA) is designed. The resonant frequency servo loop based on proportional integral control, the phase modulator reset voltage drift compensation loop and the second Closed-loop feedback control loop. Finally, the developed closed-loop digital detection circuit based on single FPGA is applied to the actual RFOG system, which verifies the above functions and actually detects the gyro signal.