单轴速率三轴位置惯性测试转台误差及传递分析

阐述了单轴速率三轴位置惯性测试转台系统误差的种类,诸如安装面与轴线平行度、位置精度和回转精度等,主要来源于安装工艺、控制系统精度、测角系统精度以及机械磨损等因素,不可避免地存在于转台系统中。由此产生了综合性的指向误差并对测试数据造成影响,文章根据飞行仿真转台的指向误差公式推导出了适合本实验用惯性测试转台的误差计算公式。依据实际的测试流程计算出各轴的指向误差,得出标度因数、阈值、分辨率等参数测试时,指向误差使得被测参数偏小;而对于交叉耦合参数,造成被测参数偏大,在对高精度陀螺组合测试时应予以估计和补偿。

Errors Propagation Analysis of Single-axis Rate and Three-axis Position Turntable

This paper describes the types of the existing system errors for three-axis inertial turntable,such as parallel degree between fixation plane and axis,position precision and rolling precision.Those errors which result from installation technology,precision of control system,precision of measuring system and mechanical abrasion come into being the pointing error so as to influence the measuring data.Based on the flight-simulation turntable pointing error formula,error calculating equations for this inertial turntable are deduced.Through the measurement sequence,pointing error of each axis is calculated.The result is concluded that the pointing error would make the parameters small,such as scale factor,threshold,resolution and so on,whereas pointing error would make cross-coupling parameter great,which should be estimated and compensated in measurement of high-precision gyro units.