下放式ADCP实时处理与数据后处理研究
文献类型：学位论文
| 作者 | 汪德华 |
| 学位类别 | 博士 |
| 答辩日期 | 2009-05-26 |
| 授予单位 | 中国科学院声学研究所 |
| 授予地点 | 声学研究所 |
| 关键词 | 声多普勒流速剖面仪（ADCP） 自容式ADCP 下放式ADCP 脉冲对 资料后处理 |
| 其他题名 | Research on the Real-time Processing and Data Post-processing of LADCP |
| 学位专业 | 信号与信息处理 |
| 中文摘要 | 声多普勒流速剖面仪（Acoustic Doppler Current Profiler，简称ADCP）是一种利用多普勒原理进行流场测量的声学设备，广泛应用于海洋监测、物理海洋等领域。 本文在系统介绍低功耗硬件平台的基础上，分析并设计了自容式ADCP（Self-Contained ADCP, 简称SCADCP）的实时信号处理算法和流程控制策略。自容式ADCP又分为两种工作模式：坐底式（Bottom-mounted ADCP, 简称BMADCP）和下放式ADCP (Lowered ADCP, 简称LADCP)。LADCP是把自容式ADCP与CTD等设备捆绑在一起，从海表面以一定的速度下放到近底层，从而获得大深度流场流速剖面的一种工作方式。在此基础上，编程实现了LADCP的两种资料后处理算法：递推法和求逆法，并利用这两种算法对海试数据进行了后处理。 具体研究内容如下： 1) LADCP信号处理算法研究。针对LADCP投放式测量的工作特点，提出了流中找底的工作模式，在一帧发射信号中同时测流测底，节省发射能量的同时提高了工作帧率。针对小速度下ADCP测速精度较差的问题，介绍了脉冲对测速法，提高了测速精度。 2) 海试验证。对2009年4月300kHz LADCP工程样机（包括走航式和下放式两种工作模式）南海海试数据进行了处理和分析，在考核系统性能的同时，对信号处理算法进行了全面验证。 3) LADCP资料后处理研究。后处理就是将LADCP的原始观测数据通过一定的算法反演出整个流场的流速剖面。本文详细介绍了递推法和求逆法，并结合海试数据，对比分析了两种算法的异同点。 |
| 英文摘要 | Acoustic Doppler Current Profiler (ADCP) is a current measurement instrument based on the Doppler principle. It’s widely used in many fields, such as ocean monitoring, physical oceanography, etc. Based on systemic analysis of low-power-consumption hardware environment, the real-time signal processing algorithms and flow control strategy of Self-contained ADCP (SCADCP) are analyzed and implemented. SCADCP has two working modes: Bottom-mounted ADCP (BMADCP) and Lowered ADCP (LADCP). Mounted on a CTD frame, the LADCP can provide full water column absolute velocity profiles by being lowered down with a standard hydrographic wire at a speed usually less than 1m/s. In order to obtain the absolute profiles, two data post-processing algorithms: shear method and inverse method, are introduced. The research areas of this thesis are as follows: 1) Research on signal processing algorithms. According to the working characteristics of LADCP, a new working mode is put forward. In this method, current profiling and bottom tracking are processed in a single ping, also, energy is saved and ping rate improved. In order to obtain high resolution bottom tracking data and current profiling data especially at small speed, the pulse-pair method is fetched in, and the mean error and variance are decreased evidently. 2) Verification by sea trial. A sea trial of 300 kHz SCADCP (VMADCP and LADCP included) was carried out in the South China Sea in April 2009, and the sea trial data were processed and analyzed. The sea trial proved system performance of SCADCP, and also verified the signal processing algorithms roundly. 3) Research on data post-processing of LADCP. Data post-processing is a method to produce unreferenced profiles of current velocity from raw profiles, and two methods are introduced in detail: shear method and inverse method. Along with the processing of sea trail data, the similarities and differences are compared and analyzed. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 73 |
| 源URL | [http://159.226.59.140/handle/311008/560]  |
| 专题 | 声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文 |
| 推荐引用方式 GB/T 7714 | 汪德华. 下放式ADCP实时处理与数据后处理研究[D]. 声学研究所. 中国科学院声学研究所. 2009. |
入库方式： OAI收割
来源：声学研究所
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