资源勘探无线传输网的时间同步和数据传输研究与实现

发布时间：2018-05-11 20:54

本文选题：资源勘探 + 时间同步　；参考：《电子科技大学》2012年硕士论文

【摘要】：随着无线通信技术的发展，资源勘探过程中的信息可以通过无线传输的方式获得，和有线传输相比，这种方式能够降低勘探成本，并大大减少了大规模布线时的工作量。时间同步在无线传输系统中的作用至关重要，网内节点数据的融合，节点的定位，节点间的状态切换以及分时复用技术都需要在时间同步的基础上实现；数据无线传输方式也有很多种：基于蓝牙的无线通信，基于zigbee的无线通信，，以及基于802.11a/b/g/n的无线通信等。针对自身的硬件资源情况和不同的应用需求，应选择合适的无线通信协议实现数据的无线传输。本文首先介绍了资源勘探(地震勘探)中数据传输系统的研究现状和时间同步技术的研究现状，在此基础上分析了无线传输网中时间同步的必要性，并对GPS系统及其授时原理做了简单说明，具体分析了常用时间同步技术后，对现有典型的时间同步算法做了初步研究和比较。论文对NTP实现过程中用到的数据过滤算法，时钟选择算法，合并算法和时钟调节算法做了详细深入的研究，然后基于ARM(TI AM3517)+Linux成功搭建软硬件平台，在平台上实现了NTP同步算法，利用GPS的秒脉冲对同步精度做了进一步的提升。最后，基于IEEE802.11n协议,利用网络编程的方法，实现勘探信息的同步采集和实时传输。时间同步和数据传输功能实现后，经过室内外测试，NTP同步可以实现平均3.109ms的同步精度，结合GPS秒脉冲后精度可以提升至平均748ns，满足了数据融合对时间精度的要求；数据传输软件的功能也全部实现，在选择合适的路由组网方案后，网络最大吞吐量最大可达28Mbps。测试结果表明，时间同步和数据传输均达到项目要求。
[Abstract]:With the development of wireless communication technology, the information in the process of resource exploration can be obtained by wireless transmission. Compared with wired transmission, this method can reduce the exploration cost and greatly reduce the workload of large-scale cabling. Time synchronization plays an important role in wireless transmission system. The data fusion of nodes, the location of nodes, the state switching between nodes and the time-sharing multiplexing technology all need to be realized on the basis of time synchronization. There are also many wireless data transmission modes: wireless communication based on Bluetooth, wireless communication based on zigbee, wireless communication based on 802.11a/b/g/n and so on. According to their own hardware resources and different application needs, we should select the appropriate wireless communication protocol to achieve wireless data transmission. This paper first introduces the research status of data transmission system and time synchronization technology in resource exploration (seismic exploration), and then analyzes the necessity of time synchronization in wireless transmission network. The GPS system and its timing principle are briefly explained. After analyzing the common time synchronization techniques, the existing typical time synchronization algorithms are preliminarily studied and compared. In this paper, the data filtering algorithm, clock selection algorithm, merging algorithm and clock adjusting algorithm used in NTP implementation are studied in detail. Then, based on ARM(TI AM3517) Linux, the software and hardware platform is successfully built, and the NTP synchronization algorithm is implemented on the platform. The synchronization accuracy is further improved by using the second pulse of GPS. Finally, based on IEEE802.11n protocol, the synchronous acquisition and real-time transmission of exploration information are realized by network programming. After realizing the function of time synchronization and data transmission, the average 3.109ms synchronization accuracy can be realized by indoor and outdoor testing. The precision of 3.109ms can be improved to an average of 748 ns after the combination of GPS second pulse, which meets the requirement of time precision of data fusion. The function of data transmission software is also realized. The maximum throughput of the network can reach 28Mbpsafter selecting the appropriate routing scheme. The test results show that both time synchronization and data transmission meet the requirements of the project.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TN92;TP368.1

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