| 陈允锋,方衍.流速剖面测量中的发射波形设计[J].声学技术,2016,35(6):522~526 |
| 流速剖面测量中的发射波形设计 |
| Velocity measurement based on combined waveform in acoustic Doppler current profiler |
| 投稿时间：2016-09-12 修订日期：2016-11-20 |
| DOI：10.16300/j.cnki.1000-3630.2016.06.007 |
| 中文关键词: 流速剖面 组合波形 径向流速 分辨率 |
| 英文关键词: current velocity profile combined waveform radial velocity |
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| 中文摘要: |
| 在水体剖面的流速测量过程中，深度分辨率和速度分辨率是重要的性能指标。为了满足日益提高的测量分辨率要求，文章从模糊度函数出发，设计组合波形作为流速剖面测量的发射信号，并根据其测速原理提出相应的信号处理方法，最后通过数值仿真验证该方法的有效性。理论分析和仿真结果表明：与脉宽相同的单频发射信号相比，组合波形具有更好的深度分辨率；与其中的子波形相比，组合波形在具有相同深度分辨率的前提下，获得了更好的速度分辨率和输出信噪比。 |
| 英文摘要: |
| In the measurement of current velocity profile, the depth resolution and velocity resolution are the important performance criteria. In order to satisfy the increasing requirement of high resolution measurement, this paper proposes taking the combined waveform as the emitted signal based on the ambiguous function, and further provides the corresponding signal processing method. Theoretical analysis and numerical simulation results show the effectiveness of the combined waveform, and it is seen that:1. compared with the sinusoidal signal of the same length, the combined waveform provides much higher depth resolution; 2. compared with one of sub-waves, the combined waveform achieves better velocity resolution and better signal-noise ratio under the premise of providing the same depth resolution. |
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