It is necessary to build the random error model of gyros. Several methods can be used to analyse random error model of ring laser gyro (RLG), such as power spectrum density (PSD), ARMA, and Allan variance.

• 在环形激光陀螺仪（RLG）随机误差模型分析方法中，有功率谱密度（PSD）分析，时序ARMA模型，及Alan方差分析。