光纤陀螺的角加速度误差分析与实验研究

Analysis and Experimental Research on Angular Acceleration Error of FOG

角加速度误差是光纤陀螺的一项动态误差,该误差会引起光纤陀螺捷联惯导系统的姿态误差,制约捷联惯性导航系统在高动态应用条件下的精度。针对这种情况,在光纤陀螺闭环控制模型的基础上建立了闭环光纤陀螺的角加速度误差模型,并分析了影响角加速度误差的几项重要因素,包括控制回路总增益及控制周期等;随后给出了减小该误差的方法。基于等效输入原理,通过在反馈阶梯波上叠加斜坡信号,分别在不同条件下对闭环光纤陀螺的角加速度误差进行了测试实验。实验结果表明,不同角加速度和控制回路总增益条件下的角加速度误差测试值与理论计算值基本一致,验证了该误差模型的正确性。

As a dynamic error of fiber optic gyroscope （FOG）,angular acceleration error will induce attitude error into FOG strap-down inertial navigation system and constrain the performance of the system under severe angular motion.Based on the dynamic model of closed-loop FOG,angular acceleration error model is setup and its determined factors （including the total gain and period of the control loop of the FOG） are analyzed.Correspondingly,the angular acceleration error decrease method is proposed.In order to exam this model,the angular acceleration error of the closed-loop is tested by applying a slope signal to the feedback step-wave of the FOG,based on the equivalent input principal.And the test result under different angular acceleration and total gain of different control loop is in accord with the model.