激光陀螺单轴旋转式惯导系统的转动方案分析

目前国际上的激光陀螺单轴旋转式惯导系统中,普遍采用一种四位置转停的惯性测量组合转动方案.通过对这种四位置转停方案的误差分析,指出它并不能够完全抵消掉转轴垂直平面内的所有陀螺常值漂移误差,并且载体航向变化会降低误差抵消的程度,基于此,在这种四位置转停方案基础上,首先提出了一种改进的四位置转停方案,可以抵消掉转轴垂直平面内的所有陀螺常值漂移误差,然后进一步提出了一种动态调整停止时间的四位置转停方案,使转轴垂直平面内的常值漂移误差的抵消程度不受载体航向变化的影响.分析表明,文中提出的这些改进措施和方法能够提高系统精度,而不会降低系统的可靠性,并且使用简单易行,可以应用于实际的单轴旋转式惯导系统中.

Rotation scheme for single-axis indexing RLG INS

At present, the conventional 4-position rotation-stop scheme is widely utilized in single-axisindexing RLG INS. However, its error propagation analysis shows that this 4-position rotation-stop scheme cannot completely remove the constant drifts of the gyros which are assembled in the plane perpendicular to the rotation axis, and the heading changes of the carrier body may also deteriorate the compensation effects. This paper proposes an improved 4-position rotation-stop scheme, which can remove all the constant drifts of the gyros assembled in the plane perpendicular to the rotation axis. Based on this, a 4-position rotation scheme with dynamic stop time is proposed, which can remove the influences of the body heading changes to the compensation effects. The analysis results indicate that these proposed measures and approaches, which could guarantee the system reliability and improve the system accuracy,can be easily implemented and applied in the real single-axis indexing INS.