發(fā)布時(shí)間：2018-05-11 20:54

  本文選題：資源勘探 + 時(shí)間同步　； 參考：《電子科技大學(xué)》2012年碩士論文

【摘要】：隨著無(wú)線通信技術(shù)的發(fā)展，資源勘探過(guò)程中的信息可以通過(guò)無(wú)線傳輸?shù)姆绞将@得，和有線傳輸相比，這種方式能夠降低勘探成本，并大大減少了大規(guī)模布線時(shí)的工作量。 時(shí)間同步在無(wú)線傳輸系統(tǒng)中的作用至關(guān)重要，網(wǎng)內(nèi)節(jié)點(diǎn)數(shù)據(jù)的融合，節(jié)點(diǎn)的定位，節(jié)點(diǎn)間的狀態(tài)切換以及分時(shí)復(fù)用技術(shù)都需要在時(shí)間同步的基礎(chǔ)上實(shí)現(xiàn)；數(shù)據(jù)無(wú)線傳輸方式也有很多種：基于藍(lán)牙的無(wú)線通信，基于zigbee的無(wú)線通信，，以及基于802.11a/b/g/n的無(wú)線通信等。針對(duì)自身的硬件資源情況和不同的應(yīng)用需求，應(yīng)選擇合適的無(wú)線通信協(xié)議實(shí)現(xiàn)數(shù)據(jù)的無(wú)線傳輸。 本文首先介紹了資源勘探(地震勘探)中數(shù)據(jù)傳輸系統(tǒng)的研究現(xiàn)狀和時(shí)間同步技術(shù)的研究現(xiàn)狀，在此基礎(chǔ)上分析了無(wú)線傳輸網(wǎng)中時(shí)間同步的必要性，并對(duì)GPS系統(tǒng)及其授時(shí)原理做了簡(jiǎn)單說(shuō)明，具體分析了常用時(shí)間同步技術(shù)后，對(duì)現(xiàn)有典型的時(shí)間同步算法做了初步研究和比較。論文對(duì)NTP實(shí)現(xiàn)過(guò)程中用到的數(shù)據(jù)過(guò)濾算法，時(shí)鐘選擇算法，合并算法和時(shí)鐘調(diào)節(jié)算法做了詳細(xì)深入的研究，然后基于ARM(TI AM3517)+Linux成功搭建軟硬件平臺(tái)，在平臺(tái)上實(shí)現(xiàn)了NTP同步算法，利用GPS的秒脈沖對(duì)同步精度做了進(jìn)一步的提升。最后，基于IEEE802.11n協(xié)議,利用網(wǎng)絡(luò)編程的方法，實(shí)現(xiàn)勘探信息的同步采集和實(shí)時(shí)傳輸。 時(shí)間同步和數(shù)據(jù)傳輸功能實(shí)現(xiàn)后，經(jīng)過(guò)室內(nèi)外測(cè)試，NTP同步可以實(shí)現(xiàn)平均3.109ms的同步精度，結(jié)合GPS秒脈沖后精度可以提升至平均748ns，滿足了數(shù)據(jù)融合對(duì)時(shí)間精度的要求；數(shù)據(jù)傳輸軟件的功能也全部實(shí)現(xiàn)，在選擇合適的路由組網(wǎng)方案后，網(wǎng)絡(luò)最大吞吐量最大可達(dá)28Mbps。測(cè)試結(jié)果表明，時(shí)間同步和數(shù)據(jù)傳輸均達(dá)到項(xiàng)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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TN92;TP368.1

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本文編號(hào)：1875560