摘要
结合惯导系统标定时的"四位置"误差问题,从理论上分析了光纤陀螺的磁敏感性对其零偏的影响机理,得到地磁场对光纤环的影响角度θ_0与光纤陀螺零偏误差的余弦函数模型;相位误差Δφ与磁场强度H呈线性关系;任一方向磁场对光纤陀螺的作用下都可以分解为正交两磁场的单独作用之和等结论。最后,对两支F120型高精度光纤陀螺进行常温静态测试,测试得到在全方位范围内,陀螺的零偏极差分别为0.2o/h、0.28o/h,加磁屏蔽后,陀螺的零偏极差减小到为0.027o/h、0.038o/h,磁屏蔽能有效减小地磁场对高精度光纤陀螺零偏的影响。
Combined with ＂four position＂ error problem in inertial navigation system calibration,it was analyzed that the influence mechanism of magnet sensitivity on zero bias stability of FOG in theory,we can obtain the cosine function model between gyro bias and the angle that magnetic field effect on the optical fiber ring;the Influence of magnet field on bias stability is linear,the influence of magnet field with arbitrary directions can be resolved into the sum of two orthotropic magnet fields.Finally,we tested two F120 high precision fiber optic gyroscopes at room temperature and static state,and got zero bias of gyro is 0.2o/h,0.3o/h in all direction range,and zero bias of gyro was decreased to0.027o/h,0.038o/h with magnetic shielding,the magnetic shielding can decrease the influence on zero bias of high precision FOG from earth＇s magnetic field effectively.
出处
《电子测量技术》
2016年第1期147-150,共4页
Electronic Measurement Technology
基金
"十二五"国家科技支撑计划
村镇空间规划地理信息卫星快速测高与精确定位技术研究(2012BAJ22B01)项目
关键词
光纤陀螺
地磁场
磁敏感性
零偏
磁屏蔽
fiber optic gyro
earth＇s magnetic field
magnet susceptibility
zero bias
magnetic shielding
