静电陀螺漂移误差模型的比较研究

本文对静电陀螺伺服测漂所得的试验数据进行分析处理,对常用陀螺漂移模型进行修正,结果表明,改进模型中陀螺转子变形的奇次谐波与电极碗横向错位耦合产生的干扰力矩,对高精度静电陀螺导航系统的影响是不容忽视的。与常用模型相比,用改进模型拟合试验数据,漂移速度残差将显著减小,因此改进模型进一步完善了陀螺漂移误差补偿模型,对提高导航系统精度具有实用意义。文中还根据静电陀螺的工作环境和伺服测漂的(?)验条件,对影响陀螺漂移精度的干扰源作了分析,并根据不同测试时间段漂移模型系数的变化趋势,提出了用时变参数漂移模型处理试验数据的构想。结果表明,与常系数漂移模型相比,它可以进一步减小漂移速度残差,得到更为满意的结果。

A Study on ESG Drift Error Models Comparison

Electrostatic gyroscope (ESG) test data obtained by using a two-axis servo turntable is analyzed in this paper,and the normal gyro drift model is improved. Results show that the disturbing torque caused by the coupling of odd harmonics of gyro rotor deformations with electrode cavity assembling errors can not be ignored in high accuracy ESG navigation system. Compared with the normal model, the improved model consummates the gyro drift error compensation model. According to the working environment of ESG and test conditions,the disturbing sources which affect the gyro drift accuracy are also analyzed. The idea of a time-variable coefficient drift model is proposed. Compared with the constant coefficient drift model, the time-variable coefficient drift model makes the residual errors of the drift angular velocity reduced.