摘要
在干涉式光纤陀螺中,当调制信号超出限制并进行2π复位时,调制信号输入的调制量与输入角速度间出现了2π的相位差,这使实际的干涉相位出现左移或右移2π,即跨条纹工作。在光纤陀螺闭环系统中,跨条纹工作产生的误差体现在随机游走系数和非线性度上。该文通过优化调制方案建立跨条纹误差抵消机制,可使跨条纹产生的误差互相抵消,从而提高光纤陀螺的非线性度和随机游走系数。经过仿真和实验表明该方法有效。
In interferometric fiber-optic gyroscopes(FOGs),when the modulation signal exceeds the limit and undergoes a 2πreset,a 2πphase difference appears between the modulation amount of the modulation-signal input and the input angular velocity.This causes the interference phase to shift left or right by 2π,i.e.,a cross-fringe operation.In a FOG closed-loop system,the error caused by the cross-fringe operation is reflected in the random-walk coefficient and nonlinearity.In this study,a cross-fringe error-cancellation mechanism is established by optimizing the modulation scheme,which can cause the cross-fringe errors to cancel each other,thus greatly improving the nonlinearity and random-walk coefficient.After simulated and physical verification,the results show the effectiveness of this method.
作者
赵海波
莫馁
李旭东
ZHAO Haibo;MO Nei;LI Xudong(The 26th Institute of China Electronics Technology Group Corperation,Chongqing 400060,China)
出处
《压电与声光》
CAS
北大核心
2024年第2期219-222,共4页
Piezoelectrics & Acoustooptics
关键词
光纤陀螺
调制解调
非线性
跨条纹误差
fiber optic gyroscope
modulation
demodulation
nonlinearity
cross fringe error
