自由转子陀螺仪的伺服测试技术研究

自由转子陀螺仪是目前精度最高的一种陀螺仪,没有精密的力矩器,因此,只能采用双轴伺服法来辨识其漂移误差模型。介绍了双轴伺服测试法的基本原理,给出了双轴伺服转台的运动轨迹及重力矢量的变化规律。根据转台的运动特性,建立了自由转子陀螺仪的漂移误差模型,导出双轴伺服转台转角数据估计漂移误差模型系数的算法。从测试结果可以看出自由转子陀螺仪的长时间精度高,表明采用伺服测试法能够获得极高的测试精度,伺服转台可以作为测试自由转子陀螺仪精度的装置。

Study on Servo Test Technology of Free-rotor Gyroscope

The free-rotor gyroscope is one of gyroscope with the highest precision at present and has no precision torque generator,therefore its drift error model is obtained from the two-axis servo turntable mode.First,the essential principle of the two-axis servo turntable test is presented in this paper.Then the trajectory of the turntable motion and the transformation law of the gravitational acceleration are derived.Moreover the drift error model of the free-rotor gyroscope is founded and the arithmetic for identifying the coefficient of the drift error model is deducted from the angle data of the two-axis servo turntable.Finally,test results show that the free-rotor gyroscope has the feature of high precision,the method of the servo turntable testing has higher resolution and better precision,and the servo turntable can be regarded as the device which is the precision standard for the free-rotor gyroscope.