四频差动激光陀螺最佳工作点实时控制技术

为了降低四频差动激光陀螺（FMDLG）零偏对外界因素影响的敏感性，采用了最佳工作点实时控制技术。该技术使用色散平衡和稳频偏置的方法，对增益区磁场和失谐频率进行小幅度正弦调制，在FMDLG输出零偏中解调出误差信号，经负反馈控制回路使FMDLG在对外界干扰敏感性最小的唯一最佳工作点下工作。与仅使用光强差进行稳频的传统方法相比，最佳工作点控制技术大大降低了FMDLG的磁敏感度和零偏稳定性，证实了FMDLG最佳工作点实时控制技术的有效性；静态、动态测试实验结果证明了该技术的正确性。

Real-Time Control Technique of Optimal Operating Point in Four-Mode Differential Laser Gyro

In order to minimize the bias sensitivity of a four-mode differential laser gyro (FMDLG) to external interference, an optimal operating point real-time control technique is adopted. Dispersion equalization and path-length control offset are used. The magnetic field of gain zone and detune frequency are sinusoidally modulated, then the error in the bias of FMDLG is demodulated. By negative feedback it is operated at the only optimal point on which the sensitivity to interference is smallest. The optimal operating point means the minimum bias sensitivity to magnetic field and path-length control error. In comparison with traditional path-length control method, the optimal operating point real-time control technique shows a great reduction of the gyro magnetic sensitivity and bias instability, which proves its effectiveness，and static and dynamic test results prove its correctness.