光纤陀螺常值漂移误差自补偿方法

Error Auto-compensation of Constant Drift of FOG

光纤捷联惯导系统(SINS)中,光纤陀螺常值漂移是导致SINS导航误差的主要因素。阐述了单轴旋转误差自补偿技术的基本原理,针对传统单轴旋转调制不能补偿与旋转轴平行方向上的陀螺常值漂移误差,给出了一种改进的单轴旋转式惯导系统误差自动补偿方法。将惯性测量组件(Inertial Measurement Unit,IMU)倾斜安装,不与旋转轴正交或重合,理论分析了这种配置方案可以有效地补偿一般单轴旋转方案中不能补偿的光纤陀螺常值漂移误差,从而大大提高系统的导航精度,最后给出了仿真结果。仿真结果表明,改进的单轴旋转方案能够明显的提高惯导系统的精度。

Constant drift of FOG is one of the main factors of navigation error in FOG strapdown inertial navigation system（SINS）.The auto-compensation principle of the single-axial rotation inertial navigation system was introduced.An auto-compensation of inertial navigation system based on improved single-axis rotation was proposed,aiming at the issue that gyro constant drift error,parallelism with the rotation axis,can not compensate by traditional single-axis rotation.Inertial Measurement Unit（IMU） was tiltly mounted,e.g.neither perpendicularly,nor coaxially,with the rotation axis.Analysis and derivations show that this angle arrangement of IMU can restrain the expansion of the system errors caused by inertial units.Simulations demonstrate the consistence of the theoretical analysis and the system performances.The simulation results show that the improved single-axis rotation could improve the inertial navigation system precision significantly.