研究了四频激光陀螺角度随机游走的组成，它避免了机械抖动陀螺通过锁区所产生的随机游走效应带来的问题。通过改变放电电流，测量各种激光光强下的陀螺脉冲的时序输出，计算出不同光强值所对应的随机游走系数，根据量子噪声的特点，分离得到随机游走的量子噪声和非量子噪声成分。实验结果表明，在目前四频激光陀螺已达到的水平和使用条件下，非量子噪声成分占主要地位。若能通过设计去除或削弱非量子噪声成分的组成因素，将使随机游走减小，陀螺的性能将得到提高。

The composition of the angle random walk in the four-mode ring laser gyro (RLG) has been researched. It escapes the trouble from the type of random walk caused by crossing the dead band contained in the dithered RLG. By changing the current of the gyro, the time order pulse output of the gyro in different laser intensities is measured. Then the random walk coefficients of the corresponding laser intensities are calculated. According to the feature of the quantum noise, the random walk can be separated into two parts: the random walk due to spontaneously emitted photons and the random walk due to other causes. The experimental results show that the random walk due to other causes plays a more important role in the current status of technology. If the part of random walk could be eliminated or weakened, the value of the random walk would be reduced, and the performance of the gyro would be improved.