旋转式光纤捷联惯导系统的误差效应分析

摘要

旋转式光纤捷联惯导系统的误差效应研究关乎系统的设计和精度的提高.在建立惯性元件误差模型的基础上,分析了系统的旋转调制原理,推导了惯性元件的零偏、安装误差、标度因数误差和随机误差在单轴单方向旋转下产生的误差效应,仿真研究了转速大小对系统精度的影响.结果表明,旋转调制可以有效补偿与转动轴垂直方向惯性元件的零偏,且转速越大效果越好;旋转调制会引入额外的标度因数误差效应,且转速越大误差越大.在设计旋转式捷联惯导系统时,要求惯性元件的标度因数误差和安装误差尽可能小,并且转速不宜过大,采取正反旋转相结合的方式可以取得更显著的误差补偿效果.%The study on error effects of rotating strapdown inertial navigation system is very important to the system design. Based on the error model of inertial components, the rotation-modulation principle is analyzed. Then, for the case of single-axial and single-direction rotation, the error effect equations are derived which are produced by bias, fixing error, scale factor error and random drift of inertial components. Besides, the effect of the rotating velocity on the system errors is studied by simulation. The results show that the rotation-modulation is able to suppress the bias of inertial components against to rotating axis, and the faster the better; but it would bring additional scale factor error, and the faster the bigger. When the rotating strapdown inertial navigation system is designed, small scale factor error and fixing error are demanded, and proper rotating velocity is needed. Furthermore, the positive-and-negative rotation method can obtain more obvious error-compensation effect.