Analysis of error output characteristics of DRLG

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.