摘要
针对采用方波偏置调制、阶梯波反馈调制方案的全数字闭环光纤陀螺"死区"现象的机理进行了实验和仿真研究。为了考察闭环检测反馈环节对干扰的影响,在开环检测的状态下,叠加了长周期固定台阶高度的数字阶梯波,得到阶梯波总高度和开环输出之间的相关性,建立了含干扰通道的光纤陀螺开环检测模型。根据形成数字阶梯波电压大小的等价性,将上述开环模型转换为闭环模型,对闭环简化模型进行了理论分析和仿真计算,并与闭环"死区"测量曲线进行了对比。实验样机阶梯波电压和开环输出线性相关系数为0.97,根据开环测得的耦合系数仿真出的闭环"死区"范围与实验值相差6.7%。结果表明:干扰随阶梯波电压线性变化是闭环光纤陀螺"死区"产生的机理之一。
The dead-zone attached with all-digital close-loop Fiber Optic Gyro （FOG） which employs square wave bias modulation and step wave feedback modulation was researched. The dependence between the height of step wave and open-loop output of the FOG was obtained with a correlation coefficient equaling 0.97, and an open-loop detection model taking this correlation into account was established. Based on the equivalence of digital step wave height set up by fixed step or feedback step, the above open-loop model was modified to close-loop model. The close-loop model was analyzed by theory and simulation. The simulation dead-zone range was compatible with the experimental one with an error of 6.7%. The results show that the linear correlation between the height of step wave and the output is one of the factors of dead zone.
出处
《光电工程》
EI
CAS
CSCD
北大核心
2008年第5期61-65,共5页
Opto-Electronic Engineering
基金
国防预研重点基金资助项目(9140A09010106HK01)
863计划资助项目
关键词
光纤陀螺
线性相关
死区
干扰
FOG
linear correlation
dead zone
crosstalk
