Mechanical dither is widely applied to reduce ‘lock in’ of the ring laser gyroscope (RLG) based on the principle proposed by Sagnac in 1913. This article reviews recent developments in the field for the optimal d...Mechanical dither is widely applied to reduce ‘lock in’ of the ring laser gyroscope (RLG) based on the principle proposed by Sagnac in 1913. This article reviews recent developments in the field for the optimal design of the dither mechanism that decides the effect of bias to some extent. The proper dither signal and its control directly influence dither efficiency. Stable and accurate error compensation can further improve the performance of RLG. Some proposals are then made for future research in the field.展开更多
温度是影响激光陀螺精度的主要因素之一,对温度引起的机抖激光陀螺漂移进行精确建模,对提高激光陀螺捷联惯导系统的精度具有十分重要的意义。介绍了机抖激光陀螺的温度特性,建立了基于改进人工鱼群算法(Improved Artificial Fish Swarm ...温度是影响激光陀螺精度的主要因素之一,对温度引起的机抖激光陀螺漂移进行精确建模,对提高激光陀螺捷联惯导系统的精度具有十分重要的意义。介绍了机抖激光陀螺的温度特性,建立了基于改进人工鱼群算法(Improved Artificial Fish Swarm Algorithm,IAFSA)的机抖激光陀螺温度补偿模型,给出了IAFSA建模的详细步骤和方法,对传统的逐步回归方法和IAFSA进行了比较。结果表明:IAFSA可以对温度引起的激光陀螺漂移进行精确建模,补偿后的激光陀螺零偏不稳定性达到0.001 85(°)/h,比传统的逐步回归方法建模精度提高了15.5%,得到的温度补偿模型可以对陀螺的零偏进行实时补偿,设计了两种典型的温度试验,获得了满意的补偿效果。展开更多
文摘Mechanical dither is widely applied to reduce ‘lock in’ of the ring laser gyroscope (RLG) based on the principle proposed by Sagnac in 1913. This article reviews recent developments in the field for the optimal design of the dither mechanism that decides the effect of bias to some extent. The proper dither signal and its control directly influence dither efficiency. Stable and accurate error compensation can further improve the performance of RLG. Some proposals are then made for future research in the field.