陀螺标度因数误差对双轴旋转惯导系统导航精度影响研究

Effects Research on Gyro Scale Factor Errors on Navigation Accuracy of Dual-axis Inertial Navigation System

针对陀螺对称性标度因数误差对双轴旋转惯导系统导航精度的影响问题,采用一种合理的十六次序双轴转位方案,分析了陀螺对称性标度因数在双轴旋转惯导系统中的误差效应,并对不同对称性标度因数误差对导航精度的影响进行了仿真。结果表明,三个轴的陀螺对称性标度因数误差大小与导航经度误差大小成线性关系,并且满足线性叠加性,两个转动轴上陀螺对称性标度因数误差对导航精度的影响程度大于非转动轴。最后提出了减小陀螺对称性标度因数误差对导航经度误差影响的措施,可以为双轴旋转惯导系统的进一步优化和工程设计提供理论参考。

Aiming at the effects of the symmetrical scale factor errors of gyros on navigation accuracy of dual-axis rotary inertial navigation system （INS）, a reasonable sixteen order dual-axis rotation scheme is employed, the effects of the symmetrical scale factor errors of gyros in dual-axis rotary INS are analyzed, and the effects of different symmetrical scale factor errors of gyros on navigation accuracy are simulated. Results show that, the size of gyro symmetrical scale factor error has a linear relationship with the size of navigation longitude error which satisfies the linear superposition, and the symmetrical scale factor errors of gyros on two rotary axes affect more seriously than the non-rotary axis. Finally, measures to reduce the effects of symmetrical scale factor errors are proposed, which can offer the academic basis for optimizing and designing of dual-axis rotary INS.