研究了用于干涉型单模光纤陀螺系统的正交锁相检测方法，采用双参考信号，使输出的信号与噪声分离，不仅提高了光学系统信号的信噪比，同时可以引入移相反馈控制，大大减小了系统的漂移，系统的零点漂移已达到0.2 deg/h。

A orthogonal phase locked detection method used in interference single mode fiber gyro is described in this paper. This method using double reference signal can separate gyro signal from noise. The noise level of the gyro signal can be reduced, and phase shift feedback can be used in the gyro. The zero drift of the gyro reduces to 0.2 deg./h.