| 宽带声学多普勒流速剖面仪的中频正交采样算法 |
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| 引用本文： | 彭东立,马海涛,许伟杰. 宽带声学多普勒流速剖面仪的中频正交采样算法[J]. 声学技术, 2013, 32(1): 15-18 |
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| 作者姓名： | 彭东立 马海涛 许伟杰 |
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| 作者单位： | 中国科学院声学研究所东海研究站 |
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| 摘 要： | 宽带声学多普勒流速剖面仪(Broadband Acoustic Doppler Current Profile,BBADCP)发射由伪随机编码调制的正弦信号,信号带宽在频域上产生展宽,成为带通信号。宽带回波信号的处理多采用正交解调的方法,但此方法对采样率的要求较高,硬件较难实现。利用数字中频正交采样法来实现,大大降低了采样频率,并且针对BBADCP解模糊速度的要求,进行了宽带回波信号的仿真试验,结果证明插值的数字中频正交采样法适合于BBADCP的信号处理。
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| 关 键 词： | 声学多普勒流速剖面仪 中频正交采样 模糊速度 复协方差算法 |
| 收稿时间： | 2012-04-13 |
| 修稿时间： | 2012-07-08 |
The quadrature sampling method for broadband acoustic Doppler current profile |
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| PENG Dong-li,MA Hai-tao and XU Wei-jie. The quadrature sampling method for broadband acoustic Doppler current profile[J]. Technical Acoustics, 2013, 32(1): 15-18 |
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| Authors: | PENG Dong-li MA Hai-tao XU Wei-jie |
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| Affiliation: | (Shanghai Acoustic Laboratory,Institute of Acoustics,Chinese Academy of Sciences,Shanghai 200032,China) |
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| Abstract: | The signal transmitted by Broadband Acoustic Doppler Current Profiler is a kind of pseudo-random coding signal. The impulse signal is a broadband signal due to frequency spectrum spreading. The reverberation signal of BBADCP is processed with quadrature demodulation, while it is difficult to realize because of the required high sampling rate. Digital quadrature sampling of intermediate frequency (IF) signal is used to decrease the sampling rate. According to the requirement of resolving the ambiguity velocity, the broadband reverberation signal is simulated to calculate the velocity of current. The result verifies that the proposed method is appropriate to signal processing of BBADCP. |
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| Keywords: | acoustic Doppler current profile quadrature sampling of IF signal ambiguity velocity complex covariance approach |
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