干涉型光纤水听器PGC解调的DSP系统实现
文献类型：学位论文
| 作者 | 袁大岭 |
| 学位类别 | 博士 |
| 答辩日期 | 2005 |
| 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 调制解调 |
| 其他题名 | Implementation of PGC Demodulation for Interferometric Optic Fiber Hydrophone Based on DSP System |
| 中文摘要 | 干涉型光纤水听器是20世纪70年代末发展起来的一种新型水声传感器。在过去的20多年中，光纤水听器技术在理论研究与工程应用方面均得到子决速发展，已开始运用于声呐系统、海洋探测、石油勘探等领域。在多种干涉型光纤水听器的信号检测技术中，PGC（PhseGenerationCarrier）调制与解调技术由于其检测动态范围大、频带宽、适宜检测微弱信号等优点已成为光纤水听器信号检测的基本方法，并作为基本的信号检测技术应用于基于各种复用技术的光纤水听器阵列中。本文提出了基于DSP系统的PGC解调的软硬件实现方案。针对调制光源的频率漂移而产生的相位噪声，在DSP系统实现中采用一路A／D转换器对调制信号进行同步采样，从而克服了该相位噪声产生的解调信号失真。为提高待检测信号的有效带宽，适宜大幅度信号或宽带信号的检测，系统采用了高速的A／D转换器，为调制频率的提高留下了空间。提出了基于TMS320C6201的PGC解调算法的定点实现，分析了定点实现的误差，并给出了对实际海试数据的处理结果。结合TMS32OC6201的CPU结构、片内资源和算法本身的特点，对算法实现进行了优化，降低了解调时间和数据的存储量，对实时应用具有重要意义。最后，对PGC解调技术的瓶颈和基于各种复用技术的阵列化应用提出了可能的解决方案。 |
| 英文摘要 | Optic fiber hydrophone, a new type hydrophone, has been developed from the late 1970s. During the past twenty years, related technology of fiber optic hydrophone has made great progress both in theoretical research and engineering application and some production has been applied in many domains such as sonar system, ocean research and petroleum detection. Of the various methods of fiber optic hydrophone signal detection, PGC(Phase Generated Carrier)modulation and demodulation technique has been the principal method because of its advantages such as large dynamic range, broad band, the capability of detecting microradian signal, etc. In most fiber optic hydrophone array systems based on all kinds of multiplexing, PGC demodulation technique is also the principal method of signal detection. An implementation of PGC demodulation algorithm based on DSP system is demonstrated in this dissertation. To overcome the phase noise which is generated from the frequency offset of modulating laser source, an additional A/D channel in the system is used to sample the modulating signal. A high speed A/D converter is used to make room for the improvement of modulation signal frequency, which make the system is available when the detected signal is big amplitude signal or the detected signal is broad band signal. The digital implementation of algorithm that is suitable for DSP is demonstrated and the signals' fixed-point representation is shown. To adapt for the real-time application and reduce the memory requirement, the algorithm is optimized considering the CPU architect and chip resources of TMS320C6201. The experiment shows the comparison of operation time and memory requirement between the normal and optimized algoritlim. At last, the bottleneck of PGC demodulation algoritlim and some possible solution of future multiplexing application are talked about. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 57 |
| 源URL | [http://159.226.59.140/handle/311008/1004]  |
| 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 | 袁大岭. 干涉型光纤水听器PGC解调的DSP系统实现[D]. 中国科学院声学研究所. 中国科学院声学研究所. 2005. |
入库方式： OAI收割
来源：声学研究所
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