基于部分解调提前反馈的光纤陀螺振动误差抑制技术

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摘要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。

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	潘雄
	张春生
	王熙辰
	王夏霄

关键词 ：光纤陀螺, 振动, 附加相移误差, 反馈通道延迟, 稳定性

Abstract：The performance of fiber optic gyroscope (FOG) changes under vibration, which leads to vibration errors, thus it is necessary for the usage of FOG to suppress the error. It was analyzed the impacts of the closed-loop tracking ability caused by the feedback delay which exists in the totally digitalized closed-loop of FOG, and the formation mechanism of vibration error was revealed that the disturbance brought in by vibration environment cannot be able to suppressed efficiently, which finally generate additional phase errors. For suppressing the error, a method named partially demodulation advanced feedback was proposed with taking the stability of the closed-loop in consideration. The additional phase error was analyzed with different advanced feedback coefficient theoretically and virtually, and the additional phase with different advanced feedback coefficient and the outputs of FOG were experimented on vibration testing platform, and it showed that the vibration errors decreased simultaneously as well as the additional phase error when increasing the advanced feedback coefficient. The Method of partially demodulation and advanced feedback was demonstrated to be appropriate for different demodulation and it can improve the adaptability of FOG for vibration environment without modification of hardware design, such as structures design and light path design etc.

Key words： fiber optic gyroscope vibration additional phase error feedback channel delay stability;

收稿日期: 2013-05-08 出版日期: 2015-08-15

引用本文:

潘雄，张春生，王熙辰，王夏霄. 基于部分解调提前反馈的光纤陀螺振动误差抑制技术[J]. 振动与冲击, 2015, 34(15): 60-65.
Pan Xiong, Zhang Chunsheng, Wang Xichen, Wang Xiaxiao. Vibration error suppression technology for fiber optic gyroscope based on partially demodulation and advanced feedback. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(15): 60-65.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2015/V34/I15/60

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