单轴旋转捷联式惯导系统惯性器件误差指标确定方法研究

Inertial sensor error index confirmation method for single-axis rotation strapdown inertial navigation system

针对惯性元件误差调制后无法定量分析惯导系统误差的问题,提出了一种根据船用单轴旋转捷联式惯导系统定位精度指标确定惯性元件精度要求的设计方法.该方法针对单轴单向旋转和单轴往复旋转2种捷联惯导系统,以传统捷联惯导系统误差传播方程为基础,建立了导航定位误差与常值漂移误差、标度因数误差和安装误差的对应关系式.文中给出了具体的算法推导过程及简化分析依据.设计实例和计算机仿真的对比分析证明了该设计方法的正确性和可行性.该设计方法为其他方式的单轴旋转惯导捷联惯导系统设计提供了有效的参考依据.

According to the problem that the navigation error of strapdown inertial navigation system (SINS) cannot be calculated quantitatively because of modulation of inertial sensor error, this paper proposed a method which can confirm the precision requirement of inertial sensor according to the positioning precision index of ship-borne single-axis rotation SINS. By using the error propagation function of the conventional SINS, this method establishes the equation reflecting relationship between navigation position error and constant drift error, scale factor error and installation error for single-axis continuous rotation SINS and the to-and-fro rotation SINS. In the paper, specific algorithm developing procedures and basis used for simplifying analysis are illustrated. Through comparing the design examples with computer simulation, the results show that the designing method is correct and practicable, and can provide effective reference for system design of other single-axis rotation SINS.