| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 733544 | Optics & Laser Technology | 2014 | 6 Pages |
•DDM is proposed to suppress the frequency locking noise.•The frequency locking noise induced by frequency locking error is analyzed.•The model of DDM is set up and analyzed.•The frequency locking noise of the RFOG is effectively suppressed by DDM.
The performance of the resonator fiber optic gyro (RFOG) is influenced by frequency locking noise. This paper proposes a differential detection method (DDM) to suppress the frequency locking noise. First, the frequency locking noise induced by the frequency locking error is described theoretically; the description indicates that it acts as the common-mode noise in the RFOG. In the traditional signal-path detection method (SDM), there is a trade-off between suppressing the frequency locking noise and improving the gyro sensitivity. Thus, a model of the DDM is set up and analyzed. The frequency locking noise can be suppressed using the DDM by adjusting the gains of two lock-in amplifiers. Finally, the experimental setup is established, and the SDM and DDM are compared. When the tested equivalent frequency locking noise is 10.6°/h, the bias stability of the RFOG is improved from 12.9°/h to 1.1°/h by the DDM.
