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

P.I.Terray(WHOI)提案#：0327600提案标题：发展用于湍流研究的多频、超声波、脉冲相干多普勒声纳项目摘要PI提议开发一种用于边界层湍流研究的小型、低功率、单轴、距离选通脉冲相干多普勒声纳模块。该仪器将能够在各种平台上自主操作，如浮标、系泊和底架，但PI特别感兴趣的是从小型自主水下航行器使用它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由于速度谱中的多普勒相位噪声引起的偏差，从而能够测量比以前使用这类传感器可能的更小的耗散率。这里研制的声纳将是一种高频、短程仪器，空间分辨率略低于1厘米。该传感器还将是模块化的，因此可以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.