摘要
零偏稳定性是评价光纤陀螺性能的一个重要指标,Y波导的2π电压准确度和电路中的交叉干扰大小在一定程度上决定了零偏稳定性。常用的方波调制在零转速附近对2π电压的调整缓慢,导致2π电压准确度无法保证,同时引入了较大的交叉干扰,在高精度陀螺中已经很难满足性能要求。本文提出的双方波调制解调方法,能够在任意转速下快速调整2π电压,在零转速附近调整时间由方波调制的300s缩短到1s,使陀螺在全工作温度范围内正常工作;同时,运用相干检测理论对方波调制和双方波调制的交叉干扰特性进行了深入研究,得到双方波调制可以抑制交叉干扰的结论,实验表明陀螺零位偏差由方波调制的0.22o/h减小到0.06o/h,改善了陀螺的零偏稳定性。
The bias stability is an important parameter of Fiber Optic Gyro （FOG）. The Y waveguide 2π voltage and the crosstalk, to some extent, decide the performance of the bias stability. Based on square wave modulation, a double-square wave modulation method is proposed, which can perform the function of rapid adjustment of Y waveguide 2π voltage through four-state modulation and demodulation. The adjusting time around zero rotation speed is reduced from 300s to ls. Meanwhile, the coherent detection theory is applied to make a study of the crosstalk of the square wave modulation and the double-square wave modulation, which draws a conclusion that the double-square wave modulation can suppress crosstalk. Experimental results show that the crosstalk can be reduced from 0.22°/h to 0.04°/h, and the FOG＇s bias stability can be improved.
出处
《光电工程》
CAS
CSCD
北大核心
2009年第1期63-67,共5页
Opto-Electronic Engineering
基金
国防预研重点基金资助项目
