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题名	基于FPGA的光纤不听器PGC解调算法实现研究
作者	陈宇
学位类别	博士
答辩日期	2004
授予单位	中国科学院声学研究所
授予地点	中国科学院声学研究所
关键词	光纤水听器 PGC解调 可重构
其他题名	Implementation of PGC Demodulation Algorithm on FPGA, Investigations and Researches
中文摘要	光纤水听器技术的发展和光纤水听器系统的逐步应用把水声信号检测技术推向新的高度，同时也对水声数字信号处理技术提出了更高要求。对于光纤信号数字化解调的硬件实现，最主要的问题就是如何以尽量少的资源实现尽量高的采样率和尽量强的处理能力。与现有DSP解调系统相比，光纤PGC解调的FPGA实现方案具有速度快、资源占用少、系统易于扩展等优势，这些都是充分利用FPGA的工作机制和可重构特性的结 果。本文提出了用FPGA实现光纤PGC解调算法的新思路；比较了数字信号处理FPGA实现方案与DSP、ASIC实现方案的差异；分析了适合利用FPGA实现的算法所应具备的特征；提出并解决了解调算法中遇到的调制信号相位问题；在FPGA上成功实现了PGC解调算法，并对处理结果进行了分析；对不同通道数、不同采样频率下处理系统的规模进行了计算和评估。本文的研究表明：以FPGA作为光纤水听器信号处理系统的算法实现单元能够以较小的代价把系统的采样频率提高一到两个量级；系统功能和性能易于扩充；光纤水听器信号处理系统的FPGA实现不但可行而且具有广阔的发展空间。
英文摘要	In recent years the development of fiber optic hydrophones, both in labs and applications, has led to an explosion of acoustical signal detecting technology. At the same time, there's a strong animation for acoustical digital signal processing. As for the task of demodulation of fiber optical signals, there's a pressing need for a solution with high sample frequency, good capacity, and low resource cost. The solution of FPGA has reached the goals, especially comparing with the current demodulation systems based on DSP. What's more, the system based on FPGA could be easily updated, which is owing to FPGA's working mechanism and reconfigurability. The main ideas of this dissertation go as follows: Shows a new way of implementing fiber optic hydrophone's PGC demodulation algorithm, which is based on FPGA Makes a thorough comparison between FPGA and DSP/ASIC in digital signal processing Summarizes some main features of the algorithms which are likely to be accomplished with FPGA successfully Observes the problems of modulation phase, and finds a way to solve it Presents an implementation of the demodulation algorithm, shows the processing result, and makes an assessment on its accuracy, gives an analysis of processing cost under different sample rates and channel numbers, estimates the size of whole multi-channel system module From all the investigations and researches included in this dissertation it's easy to draw a conclusion that an FPGA-based algorithm system for fiber optic hydrophone's signal processing is a solution with high capacity and low resource cost, and with a brilliant future as well.
语种	中文
公开日期	2011-05-07
页码	72
内容类型	学位论文
源URL	[http://159.226.59.140/handle/311008/826]
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	陈宇. 基于FPGA的光纤不听器PGC解调算法实现研究[D]. 中国科学院声学研究所. 中国科学院声学研究所. 2004.

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