This paper describes random error sources, and introduces the method of Allan variance and its application at characterizing the performance of a Ring Laser Gyro(RLG).

• 本文讨论了环形激光陀螺（RLG）的随机噪声及其产生机理，并介绍了国外常用的用于评估RLG和其它精密测量仪器性能的Alan方差法，最后，应用Alan方差法来分析某型号环形激光陀螺的误差特性。