激光陀螺抖动轴失准角对陀螺精度的影响  

Analysis of Influence of Misalignment Angle of Laser Gyro Dither Axis on Gyro Accuracy

作　　者：李鹏 王慧敏[1] LI Peng;WANG Huiming(Beijing Aerospace Times Laser Inertial Technology Company Ltd.,Beijing 100094,China)

机构地区：[1]北京航天时代激光导航技术有限责任公司,北京100094

出　　处：《压电与声光》2022年第6期985-989,共5页Piezoelectrics & Acoustooptics

摘　　要：该文理论分析了二频机抖激光陀螺抖动轴和敏感轴间的失准角对陀螺精度的影响。基于刚体欧拉动力学方程建立了机抖激光陀螺动力学模型,利用刚体绕任意轴转动惯量的计算方法,计算了抖动轴失准角引起的陀螺腔体在陀螺坐标下的惯性积变化,对陀螺高频抖动时由腔体惯性积产生的横侧向力矩引起陀螺敏感轴横侧向变形进而激发单表级圆锥误差的过程进行了定量计算。结果表明,高精度应用场合抖动轴失准角应小于5′。The influence of the misalignment angle between the dither axis and sensitive axis of the mechanically dithered ring laser gyro on the gyro accuracy is analyzed theoretically. Based on the Euler dynamics equation of rigid body, the dynamic model of mechanically dithered ring laser gyro is established. The change of the product inertia of the gyro cavity caused by the misalignment angle of dither axis in gyro coordinates is calculated by the calculation method of the moment of inertia of the rigid body about an arbitrary axis. When the gyro dithers at high frequency, the lateral moment generated by the inertial product of the cavity causes the lateral deformation of the gyro sensitive axis, and then triggers the single-gyro-level coning error. This process has been quantitatively calculated in this work. The results show that the misalignment angle of gyro dither axis should be less than 5′ in high-precision applications.

关 键 词：激光陀螺 捷联惯组 失准角 

分 类 号：TN249[电子电信—物理电子学]