Extracting Meaningful Information from Uncalibrated Backscattered Echo Intensity Data
Extracting Meaningful Information from Uncalibrated Backscattered Echo Intensity Data
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DOI：
10.1175/2009jtecho704.1
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发表时间：
2010-05
影响因子：
2.2
通讯作者：
L. Gostiaux;H. Haren
中科院分区：
文献类型：
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作者：
L. Gostiaux;H. Haren
提出了一种分析海洋声学多普勒海流剖面仪(ADCP)回波强度剖面的方法，特别是在未进行定标的情况下。这项研究基于Teledyne RD仪器声学剖面仪的数据，但提供了一种可以扩展到其他类型硬件的方法。为了正确解释信噪比低于10倍的数据，作者建议在求解声纳方程之前在算术空间中将后向散射信号与噪声分离，并在对数空间中补偿传输损失。对来自大西洋、北海和地中海的几个独立的数据集显示了该方法的稳健性。现在，在比噪声水平高出不到10分贝的情况下，可以估计沉积物浓度、浮游物迁移或气泡，这在一般情况下可以涉及ADCP范围的一半。
The authors present an original method for the analysis of acoustic Doppler current profiler (ADCP) echo intensity profiles measured in the ocean, especially when no calibration has been performed. This study is based on data from Teledyne RD Instrument acoustic profilers but provides a methodology that can be extended to other kinds of hardware. To correctly interpret data for which the signal-to-noise ratio is below a factor of 10, the authors propose isolating the backscattered signal from noise in arithmetic space before resolving the sonar equation and compensating for transmission loss in logarithmic space. The robustness of the method is shown for several independent datasets from the Atlantic Ocean, the North Sea, and the Mediterranean Sea. Estimation of sediment concentration, planktonic migrations, or air bubbles is now possible at less than 10 dB above noise level, which can concern half of the ADCP’s range under common circumstances.