基于固定频率激光器的低成本闭环谐振陀螺系统仿真

Simulation Research on Low-cost Closed-loop Resonator Gyro System Based on Fixed Frequency Laser

摘要:

提出了一种使用固定频率窄线宽激光器作为干涉光源的闭环谐振式光纤陀螺系统。该系统利用相位调制器对干涉光进行移频控制,完成对谐振腔逆时针方向谐振频率的跟踪和锁定。建立了陀螺系统Simulink模型并仿真研究了不同速率点下的陀螺输出特性,结果表明,±200(°)/s速率范围内逆时针谐振频率锁定时间小于15ms,陀螺标度因数非线性为2.41×10-4。与采用传统频率可调谐窄线宽激光器的闭环谐振式光纤陀螺系统相比,两者锁频时间和标度因数非线性基本一致。该研究为低成本闭环谐振式光纤陀螺系统的实现提供了理论和数据支撑。

Abstract:

A closed-loop resonant fiber optic gyroscope system using a fixed frequency narrow linewidth laser as the interference light source is proposed. The system uses a phase modulator to perform frequency shift control of the interference light to complete the tracking and locking of the resonant frequency in the counterclockwise direction of the resonant cavity. In this paper, a Simulink model of the gyro system was established and the output characteristics of the gyro were simulated at different speed points. The results show that the lock time of the counterclockwise resonance frequency in the range of ±200(°)/s is less than 15ms, and the gyro scale factor nonlinearity is 241ppm. Compared with the closed-loop resonant fiber optic gyroscope system using traditional frequency tunable narrow linewidth lasers, the frequency lock time and scale factor nonlinearity of the two systems are basically the same. This research provides theoretical and data support for the realization of low-cost closed-loop resonant fiber optic gyroscope system.