| 激光测速中多普勒频移的测定 |
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| 引用本文： | 孟影,梁平,王彦,黄其林.激光测速中多普勒频移的测定[J].安徽工业大学学报,2012(2):150-153,161. |
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| 作者姓名： | 孟影 梁平 王彦 黄其林 |
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| 作者单位： | 安徽工业大学电气信息学院 |
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| 基金项目： | 安徽省高校优秀青年人才基金项目(2010SQRL038) |
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| 摘 要： | 多普勒信号具有频率不变、相位和幅度随机取值的特点。为了获得多普勒信号的功率谱,用Welch法对功率谱进行估算,采用Goertzel对功率谱进行细化和能量重心校正。对实测多普勒信号进行仿真,结果表明：当重叠数是窗函数长度1/2时,用Welch法估算得到的方差和偏差能够达到较好的效果;频谱细化可以提高功率谱的分辨率;频谱校正使得多普勒频移更接近真实值。
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| 关 键 词： | 激光多普勒 周期图 频谱细化 频谱校正 |
Measurement of Doppler Shift in Laser Doppler Velocimetry |
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| MENG Ying,LIANG Ping,WANG Yan,HUANG Qi-lin.Measurement of Doppler Shift in Laser Doppler Velocimetry[J].Journal of Anhui University of Technology,2012(2):150-153,161. |
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| Authors: | MENG Ying LIANG Ping WANG Yan HUANG Qi-lin |
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| Affiliation: | (School of Electrical Engineering & Information,Anhui University of Technology,Ma’ anshan 243002,China) |
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| Abstract: | Doppler signal has characteristics of constant frequency and random values of phase and amplitude.In order to obtain the power spectrum of Doppler signal,the power spectrum is estimated via Welch-method,Doppler spectrum is thinned via Goertzel and corrected with energy centro-baric method.Real-time Doppler signal is simulated.The results demonstrate that variances and deviations of the estimation with Welch-method can gain better effect when the overlap number is half of window function length,frequency spectrum thinned can enhance the resolution of power spectrum,and frequency spectrum correction can make Doppler shift close to the real value. |
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| Keywords: | laser Doppler periodogram frequency spectrum refinement frequency spectrum correction |
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