光纤陀螺仪关键参数快速标定方法

Fast Calibration Method of FOG's Key Parameters

提出了一种快速标定光纤陀螺仪关键参数的方法,利用激光连续动态弯沉测量车自身的硬件平台,建立以光纤陀螺仪标度因素、零偏与输出延时为参数的数学模型,采用改进的最小二乘法进行求解,完成上述关键参数的快速标定。该方法标定过程简单快速,标定结果精度高,已成功应用在武汉大学研制的我国首台激光连续动态弯沉测量车中。

A Fiber Optic Gyroscope（FOG） is the key device in laser continuous dynamic pave- ment deflection measurement vehicle, that is used to measure the instantaneous angle be- tween a rigid staff and the horizontal direction. The precision of deflection measurements re- ly directly on the key FOG parameters ,such as the scale factor, output delay, and bias. The traditional calibration methods for these parameters require cumbersome mechanical rotating platforms. To address this problem, this paper introduces a novel method to calibrate the key parameters of FOG. A new calibration device was designed with two high precision laser vibrometers fixed on each end of a rigid staff, and an under-testing FOG was mounted in the middle. According to the locomotion equation, we established a mathematical model to de- scribe parameters, and then solved by a least mean square calculation. The novel method proposed in this paper utilizes a simple mechanical platform, a concise experiment process and easy to solve parameters. Experiments verified that the measurement results from the pro- posed method are precise. This method was successfully applied in the first continuous dy- namic pavement laser deflection measurement vehicle in China.