光纤陀螺随机游走优化技术

Optimization of random walk coefficient of fiber optic gyroscope

针对高精度应用中光纤陀螺输出随机游走限制系统性能的问题,通过选择合适的偏置相位,对光纤陀螺随机游走进行了优化.选取一组偏置相位序列,采集该组偏置相位序列下光纤陀螺系统的探测器输出,根据电子加性噪声、散粒噪声和光源相对强度噪声等影响光纤陀螺输出随机游走的主要噪声源的噪声特性,通过拟合方法实现3种噪声源的分离,结合理论推导得到最佳偏置相位和最佳噪声抑制比,从而使系统输出的随机游走系数最小.对光纤陀螺系统在最佳偏置相位和常规偏置相位处分别进行静态测试,测试结果表明:采用最佳偏置相位可将光纤陀螺的随机游走系数降低约50%,符合理论分析和计算结果.提出的光纤陀螺最佳偏置相位的拟合测试方法能获得与系统匹配的最佳偏置相位,满足工程实践的需要.

Appropriate bias phase was selected for optimization of fiber optic gyroscope（FOG） random walk coefficient（RWC） to reduce the influence of FOG random walk on the performance of high precision systems.Detector outputs of FOG system in different bias phases were detected firstly.Three main noises,electronic noise,shot noise and relative intensity noise（RIN） were separated then according to their different properties related to the detected signal power,and optimum bias phase where RWC reaches a minimum was deduced based on the noise separation results.Experimental result of static test in optimum bias phase and normal bias phase show that RWC can be reduced by about 50% by employing the optimum bias phase,which is in good agreement with the theoretical prediction.Optimum bias phase matched with FOG system can be obtained by the proposed fitting test method,which meets the needs of engineering practice.