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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。
Temperature is one of the main factors affecting the accuracy of laser gyro. Accurately modeling temperature-induced laser gyro drifting is of great significance to improve the accuracy of laser gyro SINS. The temperature characteristics of the machine-shake laser gyro are introduced, and the temperature compensation model of the machine-shake laser gyro based on the improved artificial fish swarm algorithm (IAFSA) is established. The detailed steps and methods of IAFSA modeling are given. The stepwise regression method was compared with IAFSA. The results show that the IAFSA can accurately model the temperature induced laser gyro drifting. The compensated laser gyro zero bias instability reaches 0.001 85 (°) / h, which is 15.5% higher than that of the traditional stepwise regression method. The obtained temperature compensation model can compensate the zero bias of the gyro in real time. Two typical temperature tests are designed and the satisfactory compensation effect is obtained.