基于双环单轴光纤陀螺仪的3位置寻北方法

A 3-position north finding method based on dual-ring and single-axis fiber optic gyroscope

光纤陀螺寻北仪的寻北精度与光纤陀螺仪的精度及其在单位置处的采样时间长度直接相关。针对传统单环单轴光纤陀螺4位置寻北方法的寻北精度受限于光纤陀螺仪精度和单位置采样时间的问题,提出了一种采用双环单轴光纤陀螺仪的3位置寻北方案。首先设计了一种双环单轴光纤陀螺仪。其次,基于双环单轴光纤陀螺仪,提出了一种旋转0、90、180的三位置寻北方法,推导出了航向表达式。最后,对所提方法进行了实验验证。实验结果表明,在相同单次寻北时间下,相比传统的单环单轴光纤陀螺仪4位置和2个正交放置的单环单轴光纤陀螺仪2位置寻北方法,采用所提出的方法,寻北精度分别提高了40.74%和21.95%,具有明显的精度和成本优势。

The north finding accuracy of fiber optic gyroscope north finder is directly related to the precision of fiber optic gyroscope and the sampling time length at one location.To solve the problem that the north finding accuracy of the traditional 4-position north finding method using a single-ring and single-axis fiber optic gyroscope is limited by the precision of the fiber gyroscope and the sampling time at a location,a 3-position north finding method using a double-ring and single-axis fiber gyroscope is proposed.Firstly,a double-ring and single-axis fiber gyroscope is designed.Secondly,based on the double-ring and single-axis fiber gyroscope,a 3-position north finding method with rotation angles of 0°,90°and 180°is proposed,and the heading expression is derived.Finally,experiments have been carried out to verify the proposed method.The experimental results show that under the same single north finding time,compared with traditional 4-position north finding method(using a single-ring and single-axis fiber gyro)and 2-position north finding method(using two orthogonal single-ring and single-axis fiber gyros),the north finding accuracy increases 40.74%and 21.95%respectively when using the proposed method,which has obvious precision and cost advantage.