Analysis of error output characteristics of DRLG
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摘要: 抖动机构作为机抖激光陀螺的关键环节,其参数的选择直接影响着机抖激光陀螺的误差输出特性.为了在陀螺设计时选择最佳抖动参数,提高机抖激光陀螺的测量精度,根据抖动偏频的基本原理,对抖动参数对机抖激光陀螺的偏置误差、刻度因子误差、角度随机游走误差的影响进行了深入分析.结果表明:机抖激光陀螺的偏置误差随着抖动幅度的减小而减小;在一定范围内刻度因子误差随着抖动幅度的增大而增大,超出这个范围随着抖动幅度的增大而减小;减小抖动角幅度可减小角度随机游误差.Abstract: Dither structure is the key part of dithered ring laser gyroscope (DRLG), and the dither parameters directly affect its error output characteristics. In order to choose the best dither parameters and improve the measurement accuracy of this gyroscope, the effects of dither parameters on error output characteristics-bias error, scale factor error and angle random walk error of the gyroscope were analyzed deeply based on the principles of dither bias. The results show that bias error declines with the decrease of the dither magnitude; the scale factor error increases with the increase of magnitude within a certain range, but decreases above the range. Reducing the dither magnitude can reduce the error of angle random walk.
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