数字闭环光纤陀螺仪的随机噪声分析

摘要

分别对影响陀螺仪性能的各种噪声进行了分析.利用闭环传递函数，建立了随机噪声模型，系统地研究了探测器接收光功率、偏置点和探测器跨阻抗与光纤陀螺仪随机游走系数（RWC）之间的关系.根据对随机游走系数模型的分析，选择了光学组件，组装成陀螺仪并对陀螺仪的参数进行了优化设计.得出陀螺仪的主要参数：探测器跨阻抗Rf为80 kΩ；光功率I0为100μW；相对偏置点φb为4π/5.将计算出的RWC理论值与利用Allan方差法得到的实际测量值进行了比较，验证了随机游走系数模型的正确性.%A variety of noise affecting gyro was analyzed. In addition, by using the closed-loop transfer function, the ran-dom noise model was established to systematically investigate the relationship between the detector receiving light intensity, bias operating point, the detector trans-impedance and fiber optic gyro random walk coefficient (RWC). Furthermore, the characters of the gyro was optimized. It is found that the main parameters of gyro are Rf=80 kΩ, I0=100μW,φb=4π/5. By comparing the theoretical values calculated by RWC with the actual measured values obtained by Allan variance, the correctness of the random walk coefficient model was verified.