光纤陀螺本征频率对准误差引起的零偏漂移抑制方法  

Study on the Suppression Method of Bias Drift Caused by the Intrinsic Frequency Alignment Error of Fiber Optic Gyroscope

作　　者：石海洋 于海成[1] 冯文帅[1] 郑晓娟 SHI Hai-yang;YU Hai-cheng;FENG Wen-shuai;ZHENG Xiao-juan(Beijing Aerospace Times Optical-electronic Technology Co.,Ltd,Beijing 100094)

机构地区：[1]北京航天时代光电科技有限公司,北京100094

出　　处：《导航与控制》2018年第5期100-105,99,共7页Navigation and Control

摘　　要：在温度环境下,光纤环的伸缩及光折射率的变化等会引起光纤陀螺本征频率发生变化,产生光纤陀螺本征频率与陀螺调制频率对准误差,进而导致探测器信号中的"尖峰脉冲"信号发生变化,使光纤陀螺产生零偏漂移。通过分析光纤陀螺本征频率的变化,提出了一种调制频率自动跟踪本征频率的方法,从而减小了温度条件下光纤陀螺的零偏漂移。试验验证结果表明,采用该方法的光纤陀螺在-40℃～+60℃的温度范围内固定温度点下的零偏极差减小了50%。Under environmental conditions, the expansion and contraction of the optical fiber ring and the changes of the refractive index of the optical fiber will cause eigenfrequency of the fiber optical gyroscope （FOG） to change, resulting in the alignment error between the eigenfrequency and the modulation frequency, which in turn causes the ＂peak pulse＂signal changes, resulting in the FOG bias drift. In this paper, by analyzing the change of the eigenfrequency of FOG, a method of automatically tracking the eigenfrequency by modulation frequency is proposed, which can reduce the bias drift of FOG. The experimental results show that the optical fiber gyroscope using this method reduces the bias at fixed temperature range by more than half.

关 键 词：光纤陀螺 本征频率 零偏漂移 温度 漂移抑制 

分 类 号：V241.5[航空宇航科学与技术—飞行器设计]