海洋浮标信号及接收机的设计与实现-电子与通信工程专业论文.docxVIP

摘 摘 要 I万方数据 I 万方数据 摘 要 海洋浮标监测系统是海洋监测最重要的装备之一，研究和探索海洋浮标监测新理 论、新方法和新技术是目前国内外开发海洋的前沿课题。随着卫星通信技术的快速发 展和成熟，把卫星通信与海洋浮标监测结合到一起，可以很好的解决全天候、全方位、 全自动的立体监测这一难题，因此，对海洋浮标的卫星通信基带信号及接收机的研究 对实现海洋浮标监测至关重要。 论文首先介绍了海洋浮标基带信号的设计原理，详细阐述了信号生成过程中所用 到的关键技术以及信号在 FPGA 中实现的过程，提出了通信电文分段的设计思想，并 对信号进行验证分析。其次，重点介绍了海洋浮标接收机的原理，详细阐述了设计过 程中所采用的关键技术，着重介绍了捕获算法和跟踪算法。其中，捕获算法采并行码 相位算法来捕获 C/A 码相位的方法，具体实现过程中要用到对数据处理的内插算法， FFT-IFFT 算法等；跟踪算法中详细介绍了几种跟踪环路，设计中采用码环和载波环 相结合的跟踪环路。根据浮标电文分段的特点，设计了“一次捕获，跟踪换码”的方 法来解调出电文，通信段电文再通过维特比译码算法来得到原始的海洋信息。 本文还介绍了系统软硬件的开发平台，对 FPGA 的开发流程及 FPGA+DSP 电路 板进行了阐述。最后，在实验室中完成了海洋浮标信号和接收机中频信号对中频信号 的联调测试，验证了此系统的可行性。 关键词：海洋浮标；基带信号；FPGA；捕获；跟踪 Abstract Abstract II万方数据 II 万方数据 Abstract Ocean buoy monitoring system is one of the most important ocean monitoring equipment. Studying and exploring new theories, methods and techniques for Ocean buoy monitoring become leading topic of ocean exploring at home and abroad currently. With the rapid development and mature of Satellite Communication Technology, integrating Satellite Communication with Ocean buoy monitoring system is able to well address the problem of all-weather, omnibearing and full-automatic stereoscopic monitoring. Therefore, study of Ocean buoys satellite communications baseband signal and receiver is vital to ocean monitoring system fullfillment. Ocean buoys baseband signal design and Implementation Rationale is introduced firstly in the article, then we explain the key technology for Ocean buoys satellite communication signal generating, baseband signal impletment process in FPGA detailly, present the idea of communication text segmentation and analyse verify with the signals. Secondly, we emphasize ocean buoys receiver principle introduction and describe the key tech in design process detailly, focus on Acquisition algorithm Tracing algorithm. For Acquisition algorithm, we adopt Parallel code phase capture algorithm to capture the phase of C/A code. Interpolation algorithms, FFT-IFFT algorithms and so on are used for data processin