Development of a Multifrequency, Ultrasonic, Pulse-Coherent Doppler Sonar for Turbulence Studies

P.I. Terray（WHOI）提案编号：0327600提案标题：湍流研究用多频、超声波、脉冲相干多普勒声纳的开发项目摘要PI建议开发一种小型、低功率、单轴、距离选通脉冲相干多普勒声纳模块，用于边界层湍流研究。该仪器将能够从各种平台（如浮标、系泊装置和底架）自主操作，但PI的具体兴趣是从小型自主水下航行器使用该仪器来估计底部和表面边界层中的湍流动能耗散率。这项工作的新颖之处在于，我们建议使用多个声频来减少速度频谱中多普勒相位噪声引起的偏差，从而能够测量比以前这类传感器可能测量的耗散率更小的耗散率。这里开发的声纳将是一种高频、短程仪器，空间分辨率略小于1厘米。这种传感器也将是模块化的，以便能够构建相干阵列和多基地配置。

P.I. Terray (WHOI) Proposal #: 0327600Proposal Title: Development of a Multifrequency, Ultrasonic, Pulse-Coherent Doppler Sonar for Turbulence Studies Project SummaryThe PIs propose to develop a small, low power, single-axis, range-gated pulse-coherent Doppler sonar module intended for boundary layer turbulence studies. This instrument will be capable of autonomous operation from a variety of platforms, such as buoys, moorings, and bottom frames, but the PIs specific interest is in using it from small autonomous underwater vehicles to estimate turbulence kinetic energy dissipation rates in bottom and surface boundary layers. The novel aspect of this work is our proposed use of multiple acoustic frequencies to reduce the bias due to Doppler phase noise in the spectrum of velocity, thereby enabling measurement of smaller dissipation rates than was previously possible with this class of sensors. The sonar developed here will be a high frequency, short range instrument, with a spatial resolution somewhat smaller than 1 cm. This sensor will also be modular so that coherent arrays and multistatic configurations can be constructed.