Research on Signal to Noise Ratio of Resonant Fiber Optic Gyro
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(Department of Information and Communication Engineering, School of Electronics and Information Engineering, Tongji University, Shanghai 201804, CHN)
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摘要:
谐振式光纤陀螺(Resonator Fiber Optic Gyroscope,RFOG)的核心敏感部件是光纤环形谐振腔(Fiber Ring Resonator,FRR),FRR在不同的束缚方式下表现为反射式与透射式两种结构,文章建立了两种结构的分析模型,推导出最佳工作状态下FRR的输出特性表达式。对于影响RFOG的主要噪声:背向散射噪声,通过建立两种相位调制RFOG结构,推导了两种不同结构FRR构成的RFOG在相位调制下的信号与背向散射噪声输出特性。分析了两种结构下谐振曲线最大斜率处的信号与背向散射噪声的信噪比表达式,最终证明两种结构的信噪比表达式相同,且与FRR的腔长负相关。
Abstract:
The core sensitive component of resonator fiber optic gyroscope (RFOG) is the fiber ring resonator (FRR), and it shows reflective or transmissive structure under different restraint modes. In this paper, the analysis models for the two structures are established, and the expression of FRR output characteristics under the best working conditions is derived. For the backscattered noise, which is the main noise affecting RFOG, the output characteristics of signal and backscattered noise of the RFOG being composed of two different structures of FRR under phase modulation are derived by establishing two phase modulation RFOG structures. Analyzed is the expression of the signal-to-noise ratio(SNR) between the signal at the maximum slope of the resonance curve and the backscattered noise under the two structures, and it turns out that both SNR expressions for the two structures are the same, and it is negatively related to the cavity length of FRR.
