【摘要】：隨著我國(guó)經(jīng)濟(jì)建設(shè)的快速發(fā)展,我國(guó)的鐵路建設(shè)也有了日新月異的發(fā)展,但是在我國(guó)鐵路網(wǎng)絡(luò)中占重要地位的高速鐵路信息化還存在著各種技術(shù)難題。高速鐵路信息化對(duì)于高速列車的運(yùn)維有重要的意義,通過(guò)基于無(wú)線公網(wǎng)的運(yùn)維數(shù)據(jù)通信,使得地面監(jiān)控系統(tǒng)對(duì)列車的實(shí)時(shí)狀況及時(shí)了解,可以方便做出列車的每日例行入庫(kù)檢查、檢修的安排,提高了高速列車的運(yùn)維效率。因此高速列車上基于無(wú)線公網(wǎng)的數(shù)據(jù)傳輸是高速鐵路信息化管理的一個(gè)關(guān)鍵技術(shù),然而由于在高速列車上的無(wú)線通信環(huán)境較為惡劣,導(dǎo)致無(wú)線數(shù)據(jù)傳輸?shù)目煽啃院蛯?shí)時(shí)性很難有較高的保障,這成為高速鐵路信息化又一個(gè)瓶頸。基于無(wú)線公網(wǎng)的無(wú)線數(shù)據(jù)傳輸,面對(duì)我國(guó)現(xiàn)有的公共網(wǎng)絡(luò)提供商的通信環(huán)境,很難通過(guò)網(wǎng)絡(luò)本身對(duì)高速列車的無(wú)線數(shù)據(jù)通信在短期內(nèi)有較大的改觀。因此,本文提出在應(yīng)用層優(yōu)化數(shù)據(jù)傳輸?shù)牟呗?對(duì)數(shù)據(jù)的發(fā)送和接收做出相應(yīng)的控制,提高數(shù)據(jù)通信的可靠性和實(shí)時(shí)性。本文主要工作如下： 1.在可靠性方面,本文通過(guò)采用諸多保護(hù)措施來(lái)保障數(shù)據(jù)傳輸?shù)目煽啃?同時(shí)保障列車運(yùn)行時(shí)車載無(wú)線通信設(shè)備無(wú)人值守運(yùn)行環(huán)境的可靠性。采用有限狀態(tài)機(jī)的方式提高軟件設(shè)計(jì)的可靠性,便于網(wǎng)絡(luò)狀態(tài)控制；通過(guò)使用守護(hù)進(jìn)程對(duì)無(wú)線通信軟件進(jìn)行無(wú)人值守的軟保護(hù),當(dāng)通信軟件由于不可預(yù)估的故障發(fā)生時(shí),會(huì)造成軟件工作異常,這時(shí)守護(hù)進(jìn)程可以對(duì)軟件進(jìn)行自恢復(fù)；當(dāng)守護(hù)進(jìn)程無(wú)法對(duì)軟件進(jìn)行自恢復(fù)時(shí),本文通過(guò)硬件看門狗對(duì)其進(jìn)行重新上電自恢復(fù)；本文在應(yīng)用層采用有應(yīng)答的和分包發(fā)送的策略以提高數(shù)據(jù)的傳輸成功率。 2.對(duì)于實(shí)時(shí)性方面,本文采用基于無(wú)線信號(hào)強(qiáng)度預(yù)測(cè)的發(fā)送策略,降低數(shù)據(jù)發(fā)送失敗的概率；通過(guò)數(shù)據(jù)分類傳輸,將數(shù)據(jù)可以按類存儲(chǔ),減少公有信息的重復(fù)發(fā)送；通過(guò)數(shù)據(jù)壓縮的方法,減少數(shù)據(jù)發(fā)送的數(shù)據(jù)量,發(fā)送數(shù)據(jù)量的減少也就提高了數(shù)據(jù)通信的實(shí)時(shí)性。 最后通過(guò)在運(yùn)行的高速列車上進(jìn)行實(shí)際測(cè)試以及一些仿真實(shí)驗(yàn)的驗(yàn)證,結(jié)果表明,本文提出的保障車地?cái)?shù)據(jù)通信的可靠性和實(shí)時(shí)性的諸多方法確實(shí)有很好的效果,完全可以滿足高速列車運(yùn)維的實(shí)際需要,同時(shí)一部分優(yōu)化方法已經(jīng)在本實(shí)驗(yàn)室開(kāi)發(fā)的無(wú)線數(shù)據(jù)傳輸裝置(WTD)應(yīng)用,并且在高速列車上運(yùn)行,效果良好。
[Abstract]:With the rapid development of our country's economic construction, the railway construction of our country has also been developing with each passing day, but there are still various technical problems in the informationization of high-speed railway, which occupies an important position in the railway network of our country. High-speed railway informatization is of great significance to the operation and maintenance of high-speed trains. Through the operation and maintenance data communication based on wireless public network, the ground monitoring system can understand the real-time status of trains in a timely manner. The operation and maintenance efficiency of high-speed trains can be improved by making daily routine storage inspection and maintenance arrangement. Therefore, data transmission based on wireless public network on high-speed train is a key technology of high-speed railway information management. However, the wireless communication environment on high-speed train is relatively bad. It is difficult to guarantee the reliability and real-time of wireless data transmission, which becomes another bottleneck of high-speed railway informatization. The wireless data transmission based on the wireless public network, facing the communication environment of the public network provider in our country, it is very difficult to improve the wireless data communication of the high-speed train through the network itself in the short term. Therefore, this paper proposes a strategy to optimize data transmission in the application layer, to control the transmission and reception of data, and to improve the reliability and real-time performance of data communication. The main work of this paper is as follows: 1. In terms of reliability, this paper adopts many protection measures to ensure the reliability of data transmission and the reliability of the unattended environment of the on-board wireless communication equipment while the train is running. The finite state machine is used to improve the reliability of the software design and facilitate the network state control. By using daemons to protect the wireless communication software unattended, when the communication software occurs due to unpredictable failures, the software work will be abnormal, and the daemon can self-recover the software. When the daemons can not recover the software, the hardware watchdog is used to reboot the daemons. In order to improve the success rate of data transmission, this paper adopts responsive and sub-sent strategies in the application layer. 2. In the aspect of real-time, this paper adopts a transmission strategy based on the prediction of wireless signal strength to reduce the probability of data transmission failure, through data classification transmission, the data can be stored by class, and the repeated transmission of public information can be reduced. Through the method of data compression, the amount of data sent is reduced, and the reduction of the amount of data sent improves the real-time performance of data communication. Finally, through the actual test on the running high-speed train and the verification of some simulation experiments, the results show that the methods proposed in this paper to ensure the reliability and real-time performance of the vehicle-ground data communication are indeed very effective. It can fully meet the practical needs of high-speed train operation and maintenance. At the same time, some of the optimization methods have been applied in (WTD), a wireless data transmission device developed in our laboratory, and run on the high-speed train with good results.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U29-39;TN92

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 楊芙清,梅宏,李克勤;軟件復(fù)用與軟件構(gòu)件技術(shù)[J];電子學(xué)報(bào);1999年02期

2 俞健;;高速條件下GPRS數(shù)據(jù)傳輸可靠性研究[J];電腦與電信;2009年04期

3 黃文江;倪華亞;;用電信息采集系統(tǒng)中的GSM信號(hào)增強(qiáng)[J];電力系統(tǒng)通信;2013年02期

4 張金鋒;朱巖;韓國(guó)盛;;基于GPRS的車輛監(jiān)控系統(tǒng)及數(shù)據(jù)通信可靠性研究[J];計(jì)算機(jī)與現(xiàn)代化;2011年12期

5 王惠生;GSM-R系統(tǒng)雙層網(wǎng)參數(shù)分析[J];鐵道通信信號(hào);2005年08期

6 孫惠琴;;GPRS在動(dòng)車組車載故障信息無(wú)線傳輸過(guò)程的應(yīng)用[J];鐵路計(jì)算機(jī)應(yīng)用;2011年10期

7 黃志平;趙紅衛(wèi);朱廣超;張順廣;李宇;;高速動(dòng)車組遠(yuǎn)程數(shù)據(jù)傳輸系統(tǒng)的研究與實(shí)現(xiàn)[J];鐵道機(jī)車車輛;2011年01期

8 彭文靜;;車載遠(yuǎn)程數(shù)據(jù)傳輸設(shè)備在高速動(dòng)車組上的應(yīng)用[J];鐵道車輛;2013年10期

，

本文編號(hào)：2294627