【摘要】：車路通信是車聯(lián)網(wǎng)中車輛通信的重要組成部分，但是由于車聯(lián)網(wǎng)中車輛的移動性、無線信道的開放性、復雜環(huán)境的時變性、拓撲結(jié)構(gòu)的易變性等都是車路通信面臨的挑戰(zhàn)，因此車路通信對快速組網(wǎng)、抗多徑效應、抗多普勒頻移方面提出了更高的要求。 本文針對車路通信中車輛快速移動導致的多普勒效應對有效傳輸距離和掉包率的影響，采用CC2530芯片，搭建基于ZigBee的短距離車路通信簡易平臺，在實驗數(shù)據(jù)的基礎上，分析并研究車速、多普勒頻移、天線高度等因素對有效傳輸距離和掉包率等車路通信性能的影響，并建議通過自適應調(diào)制和功率控制來應對傳輸環(huán)境的變化。 本文首先簡單介紹了車聯(lián)網(wǎng)的發(fā)展情況、車路通信在國內(nèi)外的研究現(xiàn)狀和發(fā)展趨勢，并介紹了ZigBee技術(shù)的特點、應用、網(wǎng)絡基礎以及協(xié)議棧，最終確定ZigBee為本文選擇的無線通信技術(shù)；然后提出了系統(tǒng)的總體設計方案，，分模塊闡述了系統(tǒng)的硬件設計，并在協(xié)議棧的基礎上給出了系統(tǒng)的軟件設計；再次利用遙控小車在系統(tǒng)方案的基礎上搭建了基于ZigBee的簡易車路通信平臺，在此平臺上進行了靜態(tài)和動態(tài)實驗，給出了車速對傳輸距離和掉包率的影響；最后對車路通信的傳輸距離進行了估算，并從多普勒頻移入手，對影響車路通信的因素進行數(shù)學建模，分析了這些因素對車路通信的影響。
[Abstract]:Vehicle-road communication is an important part of vehicle communication in vehicle networking. However, due to the mobility of vehicles, the openness of wireless channel, the time-variability of complex environment, the variability of topology and so on, it is a challenge to vehicle-road communication. Therefore, higher requirements for fast networking, anti-multipath effect and anti-Doppler frequency shift are put forward in vehicle-road communication. In view of the influence of Doppler effect on effective transmission distance and packet drop rate caused by vehicle rapid movement in vehicle-road communication, this paper uses CC2530 chip to build a simple platform for short-range vehicle communication based on ZigBee, on the basis of experimental data. The effects of vehicle speed, Doppler frequency shift and antenna height on the performance of vehicle communication such as effective transmission distance and packet drop rate are analyzed and studied. It is suggested that adaptive modulation and power control should be adopted to deal with the change of transmission environment. Firstly, this paper briefly introduces the development of vehicle networking, the research status and development trend of vehicle-road communication at home and abroad, and introduces the characteristics, application, network foundation and protocol stack of ZigBee technology. Finally, ZigBee is selected as the wireless communication technology. Then the overall design scheme of the system is put forward, the hardware design of the system is described by modules, and the software design of the system is given on the basis of the protocol stack. Thirdly, a simple vehicle communication platform based on ZigBee is built on the basis of the system scheme of the remote control car. Static and dynamic experiments are carried out on this platform, and the influence of speed on the transmission distance and packet drop rate is given. Finally, the transmission distance of vehicle-road communication is estimated, and the factors affecting vehicle-road communication are modeled by Doppler frequency shift, and the influence of these factors on vehicle-road communication is analyzed.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U495;TN92

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