基于加速度计信息的单轴旋转惯导混合水平阻尼方案

Mixed level damping scheme of single-axial rotation of INS based on acceleration

为提高单轴旋转惯导系统的导航精度,将水平阻尼网络应用到单轴旋转惯导中,提出基于加速度计测量信息的单轴旋转惯导混合水平阻尼方案.该方案根据加速度计的测量信息得到载体的等效加速度,而后根据载体机动时的初始速度和加速度得到载体机动过程中的外速度信息,采用外水平阻尼结构,将外速度经过网络加入惯导系统中,为系统提供一条补偿通道,实现水平阻尼.理论分析和仿真结果表明,在单轴旋转惯导中加入水平阻尼网络,可以消除系统舒拉周期和傅科周期振荡误差;提出的混合水平阻尼方案可降低载体机动对系统精度的影响,同时避免了需要实时获取准确外部参考速度信息的限制.

In order to improve the accuracy of the single-axial rotation of inertial navigation system（SRINS）,the level damping network is introduced into the system,and the mixed level damping scheme of SRINS based on acceleration is offered according to the analysis on the inner damping and the outer damping system.According to the theory analysis and the simulation,both of the schuler oscillation and the foucault oscillation are eliminated by introducing the damping network into the system,and the precision of the SRINS is greatly enhanced.At the same time,the proposed scheme can reduce the effect of the vehicle power-driven to the precision of the system,while avoiding the limit of the accurate reference velocity.