中文摘要：

研究捷联惯导系统（SINS）三轴光学陀螺带宽不一致问题及解决方法。从光学陀螺传递函数人手，分析陀螺带宽不一致引起陀螺输出不同步，进而影响姿态更新精度的机理；推导出存在陀螺带宽不一致时姿态确定精度的理论估算方法，给出频带一致性指标要求的确定思路；提出通过插值和外推进行补偿的方法，提高了姿态确定精度。利用光纤陀螺和激光陀螺组合实测数据进行姿态解算，通过补偿减小了系统的姿态确定误差，提高了导航精度，验证了理论分析的正确性。

英文摘要：

The inconsistent frequency bandwidth of optical gyros in a three-axis strapdown inertial navigation system （SINS）is studied. By using the transfer function of optical gyros, the relation between the frequency difference and the attitude error is derived, and a method to determine requirements for frequency bandwidth is given when choosing gyros. Moreover, a method to improve attitude determination accuracy is proposed by using linear interpolation or extrapolation compensation. Finally, by using a combination of fiber optic gyros and laser gyros for solving attitude, some experiments are carried out and the results verify that the theoretical analysis is correct.