Optimization of dither amplitude and frequency of RLG

摘要

Proper selection of the dither amplitude and frequency of the ring laser gyroscope (RLG) influences the effect of dither bias directly. In order to reduce RLG lock-in effectively, the dynamic lock-in width is obtained by deducing the basic RLG input-output equation in the article. The corresponding optimization model is based on the purpose of reducing the influence of dynamic lock-in. The result of the optimization shows that it is necessary to enlarge dither depth to reduce the nonlinear influence. When dither depth is large enough, there is no evident effect on the reduction of dynamic lock-in by enlarging it further. However, dynamic lock-in may be reduced to zero by modulating dither depth locally with very small value according to the results of optimization. Some constructive conclusions are obtained at the end of the article.