發(fā)布時間：2018-05-11 20:54

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

【摘要】：隨著無線通信技術的發(fā)展，資源勘探過程中的信息可以通過無線傳輸?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)模布線時的工作量。 時間同步在無線傳輸系統(tǒng)中的作用至關重要，網(wǎng)內(nèi)節(jié)點數(shù)據(jù)的融合，節(jié)點的定位，節(jié)點間的狀態(tài)切換以及分時復用技術都需要在時間同步的基礎上實現(xiàn)；數(shù)據(jù)無線傳輸方式也有很多種：基于藍牙的無線通信，基于zigbee的無線通信，，以及基于802.11a/b/g/n的無線通信等。針對自身的硬件資源情況和不同的應用需求，應選擇合適的無線通信協(xié)議實現(xiàn)數(shù)據(jù)的無線傳輸。 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)狀和時間同步技術的研究現(xiàn)狀，在此基礎上分析了無線傳輸網(wǎng)中時間同步的必要性，并對GPS系統(tǒng)及其授時原理做了簡單說明，具體分析了常用時間同步技術后，對現(xiàn)有典型的時間同步算法做了初步研究和比較。論文對NTP實現(xiàn)過程中用到的數(shù)據(jù)過濾算法，時鐘選擇算法，合并算法和時鐘調(diào)節(jié)算法做了詳細深入的研究，然后基于ARM(TI AM3517)+Linux成功搭建軟硬件平臺，在平臺上實現(xiàn)了NTP同步算法，利用GPS的秒脈沖對同步精度做了進一步的提升。最后，基于IEEE802.11n協(xié)議,利用網(wǎng)絡編程的方法，實現(xiàn)勘探信息的同步采集和實時傳輸。 時間同步和數(shù)據(jù)傳輸功能實現(xiàn)后，經(jīng)過室內(nèi)外測試，NTP同步可以實現(xiàn)平均3.109ms的同步精度，結合GPS秒脈沖后精度可以提升至平均748ns，滿足了數(shù)據(jù)融合對時間精度的要求；數(shù)據(jù)傳輸軟件的功能也全部實現(xiàn)，在選擇合適的路由組網(wǎng)方案后，網(wǎng)絡最大吞吐量最大可達28Mbps。測試結果表明，時間同步和數(shù)據(jù)傳輸均達到項目要求。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TN92;TP368.1

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本文編號：1875560