發(fā)布時間：2018-03-19 23:36

  本文選題：相位解調(diào)　切入點：多普勒信號　出處：《西安工業(yè)大學(xué)學(xué)報》2016年12期 　論文類型：期刊論文

【摘要】：為了分析激光多普勒測振儀位移測量精度誤差的主要影響因素,采用了兩次希爾伯特變換求解附帶直流偏置的激光多普勒信號的相位,推導(dǎo)了相位求解的誤差傳遞函數(shù).通過信號發(fā)生器產(chǎn)生調(diào)頻波,疊加不同強度的高斯白噪聲模擬多普勒信號,針對振動頻率1kHz,振幅10λ,信噪比為0dB的多普勒信號,得出相位解調(diào)誤差的標(biāo)準(zhǔn)差等于信號信噪比的倒數(shù).研究結(jié)果表明:當(dāng)多普勒信號的信噪比高于10dB時,采用相位法計算目標(biāo)位移精度較高;當(dāng)多普勒信號的信噪比低于-15.97dB時,采用相位法和條紋法計算目標(biāo)位移精度相當(dāng).
[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.
【作者單位】： 西安工業(yè)大學(xué)光電工程學(xué)院;西安理工大學(xué)機械與精密儀器工程學(xué)院;
【基金】：陜西省教育廳2016年度專項科學(xué)研究計劃項目(16JK1370)
【分類號】：TN24

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相關(guān)期刊論文 前10條

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2 戴榮，

本文編號：1636575