本文關(guān)鍵詞： 傳感器網(wǎng)絡(luò) 無(wú)率碼 智能交通系統(tǒng) EWF　出處：《北京交通大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：摘要：在如今社會(huì)日益發(fā)展的情況下,交通問(wèn)題已經(jīng)成為了阻礙社會(huì)進(jìn)一步發(fā)展的一大難解之題。每年全世界都因?yàn)榻煌▎?wèn)題承受著巨大的損失。所以發(fā)展智能交通系統(tǒng),改善智能交通系統(tǒng)已經(jīng)成為當(dāng)今社會(huì)迫在眉睫的一個(gè)大課題。智能交通系統(tǒng)中的數(shù)據(jù)收集、發(fā)送方式直接決定著整個(gè)系統(tǒng)的性能�，F(xiàn)有的網(wǎng)絡(luò)傳感器大多需要鋪設(shè)大量線(xiàn)路,造價(jià)昂貴,維修成本而且在環(huán)境惡劣的地方也無(wú)法正常使用�，F(xiàn)有的數(shù)據(jù)編碼方式很難適應(yīng)一對(duì)多數(shù)據(jù)廣播方式,尤其是在接收端數(shù)量巨大的情況下,不是無(wú)法保證數(shù)據(jù)準(zhǔn)確,就是需要重傳機(jī)制。這些數(shù)據(jù)收集與發(fā)送方面的問(wèn)題已經(jīng)成為阻礙智能交通系統(tǒng)發(fā)展的一大難題,亟待解決。 本文引入了新的傳感器網(wǎng)絡(luò)以改善數(shù)據(jù)收集方式,新的傳感器網(wǎng)絡(luò)使用電池和無(wú)線(xiàn)技術(shù)具有計(jì)算和無(wú)線(xiàn)通信能力,其成本低、功能豐富且經(jīng)過(guò)簡(jiǎn)單的調(diào)試就可以適用于舊有的智能交通系統(tǒng),既可以降低成本,又能提高系統(tǒng)性能。無(wú)線(xiàn)傳感器可以應(yīng)用于包括停車(chē)場(chǎng)、道路檢測(cè)在內(nèi)的多種領(lǐng)域,這在文章中都有涉及。本文還引進(jìn)了新的算法,使得通過(guò)少量傳感器收集數(shù)據(jù)就能較為準(zhǔn)確的預(yù)測(cè)未來(lái)某處的交通情況。同時(shí),提出了在沒(méi)有預(yù)置數(shù)據(jù)時(shí)使用OD矩陣預(yù)測(cè)數(shù)據(jù)。該方法在改進(jìn)后還能用于計(jì)算傳感器的最優(yōu)位置。本文還引入了基于傳感器的交通燈的自適應(yīng)控制,這相對(duì)于傳統(tǒng)方法對(duì)交通性能有著明顯改善。 本文引入了新的編碼方式以改善數(shù)據(jù)發(fā)送效率。這種新型的無(wú)率碼有著可以保證數(shù)據(jù)傳輸可靠的前提下單向發(fā)送這一獨(dú)特優(yōu)點(diǎn)。在一對(duì)多或者數(shù)據(jù)連接不穩(wěn)定的情況下相對(duì)于傳統(tǒng)的編碼方式有著明顯的優(yōu)勢(shì)。將改善后的無(wú)率碼EWF應(yīng)用于智能交通系統(tǒng)中的數(shù)據(jù)廣播非常合適。并且能大幅提高系統(tǒng)數(shù)據(jù)發(fā)送效率。本文首先提出了在智能交通系統(tǒng)中的車(chē)輛間網(wǎng)絡(luò)應(yīng)用無(wú)率碼,然后又進(jìn)一步設(shè)想將無(wú)率碼的一種改進(jìn)形式EWF應(yīng)用于智能交通系統(tǒng)的數(shù)據(jù)發(fā)送。通過(guò)建模與仿真驗(yàn)證將無(wú)率碼應(yīng)用于智能交通系統(tǒng)的可能性,并通過(guò)仿真驗(yàn)證EWF編碼區(qū)分重要數(shù)據(jù)以及非重要數(shù)據(jù)的性能。
[Abstract]:Absrtact: with the development of society nowadays, the traffic problem has become a difficult problem that hinders the further development of society. Every year, the whole world suffers huge losses because of the traffic problem. Therefore, the development of intelligent transportation system, Improving the intelligent transportation system (its) has become an urgent problem in our society. The data collection and transmission mode in the intelligent transportation system directly determines the performance of the whole system. Most of the existing network sensors need to lay a large number of lines. Expensive, maintenance costs and can't be used normally in places where the environment is bad. Existing data encoding methods are very difficult to adapt to one-to-many data broadcast, especially in the case of a large number of receiving terminals, is not impossible to ensure the accuracy of the data. These problems in data collection and transmission have become a big problem that hinders the development of its, and need to be solved urgently. In this paper, a new sensor network is introduced to improve data collection. The new sensor network uses battery and wireless technology to provide computing and wireless communication capabilities, and its cost is low. The wireless sensor can be used in many fields, such as parking lot, road detection and so on, and can be used in many fields, such as parking lot, road detection and so on, which can reduce the cost and improve the performance of the system. This is all involved in the article. This paper also introduces a new algorithm, so that the collection of data through a small number of sensors can more accurately predict the traffic situation somewhere in the future. At the same time, The OD matrix is used to predict the data without preset data. The improved method can be used to calculate the optimal position of the sensor. The adaptive control of traffic lights based on the sensor is also introduced in this paper. Compared with the traditional method, the traffic performance is obviously improved. In this paper, a new coding method is introduced to improve the efficiency of data transmission. This new rate-free code has the unique advantage of one-way transmission under the premise of reliable data transmission. The improved rate-free EWF is suitable for data broadcast in its, and can greatly improve the efficiency of data transmission. In this paper, the application of rate-free code in the network of vehicles in intelligent transportation system is proposed. Then it is further envisaged that an improved form of rate-free code, EWF, can be applied to the data transmission of intelligent transportation system, and the possibility of the application of rate-free code in intelligent transportation system is verified by modeling and simulation. The performance of EWF coding to distinguish important data from non-important data is verified by simulation.
【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(lèi)號(hào)】：U495

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本文編號(hào)：1537174