激光多普勒信号相位解调算法误差分析

发布时间：2018-03-19 23:36

本文选题：相位解调　切入点：多普勒信号　出处：《西安工业大学学报》2016年12期 　论文类型：期刊论文

【摘要】：为了分析激光多普勒测振仪位移测量精度误差的主要影响因素,采用了两次希尔伯特变换求解附带直流偏置的激光多普勒信号的相位,推导了相位求解的误差传递函数.通过信号发生器产生调频波,叠加不同强度的高斯白噪声模拟多普勒信号,针对振动频率1kHz,振幅10λ,信噪比为0dB的多普勒信号,得出相位解调误差的标准差等于信号信噪比的倒数.研究结果表明:当多普勒信号的信噪比高于10dB时,采用相位法计算目标位移精度较高;当多普勒信号的信噪比低于-15.97dB时,采用相位法和条纹法计算目标位移精度相当.
[Abstract]:In order to analyze the main factors that affect the precision error of laser Doppler vibration measuring instrument, the phase of laser Doppler signal with DC bias is solved by twice Hilbert transform. The error transfer function of phase solution is derived. Frequency modulation wave is generated by signal generator, and different intensity of Gao Si white noise is superimposed to simulate Doppler signal. For Doppler signal with vibration frequency of 1 kHz, amplitude of 10 位 and signal-to-noise ratio of 0 dB, The standard deviation of phase demodulation error is equal to the inverse of signal-to-noise ratio. The results show that when the signal-to-noise ratio of Doppler signal is higher than 10dB, the accuracy of calculating target displacement by phase method is higher, and when the signal-to-noise ratio of Doppler signal is lower than -15.97dB, The accuracy of calculating target displacement by phase method and fringe method is equal.
【作者单位】：西安工业大学光电工程学院;西安理工大学机械与精密仪器工程学院;
【基金】：陕西省教育厅2016年度专项科学研究计划项目(16JK1370)
【分类号】：TN24

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