CAJ | 학술논문

振动环境下光纤陀螺性能的变化称为振动误差，抑制或消除振动误差是光纤陀螺实用化的必然要求。分析了全数字闭环光纤陀螺反馈延迟对闭环跟踪性能的影响，揭示了振动误差的机理是振动环境引入的扰动不能得到较好的抑制，从而引入附加相移误差。为了抑制附加相移误差，在保证闭环稳定的条件下，提出了部分解调提前反馈方法。理论和仿真分析了不同提前反馈比例下陀螺闭环的附加相移误差，在振动测试台上实测了不同提前反馈比例时引入的附加相移及陀螺输出，结果表明增加提前反馈比例时附加相移误差减小，陀螺振动误差同步相应减小。部分解调提前反馈方法适用于不同的调制方式，可在不修改结构、光路等硬件设计的条件下提高光纤陀螺振动环境适应性。
진동배경하광섬타라성능적변화칭위진동오차，억제혹소제진동오차시광섬타라실용화적필연요구。분석료전수자폐배광섬타라반궤연지대폐배근종성능적영향，게시료진동오차적궤리시진동배경인입적우동불능득도교호적억제，종이인입부가상이오차。위료억제부가상이오차，재보증폐배은정적조건하，제출료부분해조제전반궤방법。이론화방진분석료불동제전반궤비례하타라폐배적부가상이오차，재진동측시태상실측료불동제전반궤비례시인입적부가상이급타라수출，결과표명증가제전반궤비례시부가상이오차감소，타라진동오차동보상응감소。부분해조제전반궤방법괄용우불동적조제방식，가재불수개결구、광로등경건설계적조건하제고광섬타라진동배경괄응성。
The performance of a fiber optic gyroscope (FOG)changes under vibration,it is called a vibration error,thus it is necessary to suppress the error for the usage of FOG.Here,the effects of the feedback delay existing in the fully digitalized closed-loop of a FOG on its closed-loop tracking performance were ananlyzed.The formation mechanism of vibration error was revealed,it was shown that the disturbances brought by vibration environment cannot be suppressed efficiently,so the additional phase errors are introduced.In order to suppress the errors,a method named partial demodulation and feedback in advance was proposed considering the stability of the closed-loop.The additional phase errors were analyzed with different proportions of feedback in advance theoretically and numerically,and the additional phases with different proportions of feedback in advance and the outputs of FOG were measured on a vibration testing table.The results showed that the vibration errors and the additional phase errors decrease simultaneously with increase in the proportion of feedback in advance;the method of partial demodulation and feedback in advance is suitable for different demodulations and it can improve the adaptability of FOG to vibration environment without modifying its hardware designs including structural design and light path design.