光纤陀螺一维惯性角度测量误差标定技术研究

One-Dimensional Angle Measurement Error Calibration Technique for Fiber Optic Gyroscope

针对光纤陀螺的一维惯性角度测量系统长期工作时产生较大的随时间累积误差,提出了一种新型角度测量误差的实时标定方法。此方法基于光学三角法测距的原理,利用2个激光位移传感器测量的位移实现角度的实时测量,在高精度转台上对测试系统进行了实验验证,通过最小二乘拟合法对误差进行了补偿。实验结果表明,该系统的角度测量范围±10°,角度测量精度±0.005°,为光纤陀螺在长时间角度测量方面提供了角度基准。该标定技术使用非接触光学测量方法,对被测物体表面无损伤。

As the angle measuring error of fiber optic gyroscope increases cumulatively under the condition of long-term operation, a new error calibration method is proposed for fiber optic sensor. The method is based on the principle of optical triangulation distance measurement, using data acquired by two laser displacement sensors to realize the real-time angular measurement, and the experimental verification of the measurement system is carried out on the high-precision turntable. Experimental results show that the range of angle measurement can be up to ±10°, while the error is about ±0. 005° through compensating the error by least square fitting method, which provides the basis for exact estimate of angle measuring precision of gyro. The non-contact optical measurement method used has no damage to the surface to be measured Key words： fiber optic gyroscope; error calibration; laser triangulation method;angular measurement; non-contact measurement; real time