试验背景目前,欧盟地区的隧道内防火与逃生系统都是基于对人类平均反应时间和步行速度的假设而设置的,但针对隧道火灾中的人类个体行为和人群的群体动态效应却鲜有研究。在欧洲,由于法律原因,研究团队很难获得真实的隧道火灾视频记录用...试验背景目前,欧盟地区的隧道内防火与逃生系统都是基于对人类平均反应时间和步行速度的假设而设置的,但针对隧道火灾中的人类个体行为和人群的群体动态效应却鲜有研究。在欧洲,由于法律原因,研究团队很难获得真实的隧道火灾视频记录用于研究人类行为。鉴于此,德国联邦数字和交通部(BMDV)和联邦公路研究所(BASt)联合弗莱堡大学(University of Freiburg)和奥地利莱奥本大学(University of Leoben)针对这一课题进行试验研究,试图了解隧道火灾中真实的人类个体行为和群体效应,并通过获得的数据评估目前的公路隧道设计标准是否需要更新。展开更多
This study focused on differences in vehicle-to-vehicle radio channel character- istics in the same region but different traffic density and speeds at 5.9 GHz （congestion and non-congestion）. The continuous measurem...This study focused on differences in vehicle-to-vehicle radio channel character- istics in the same region but different traffic density and speeds at 5.9 GHz （congestion and non-congestion）. The continuous measurement campaign was conducted on a city expressway through the complex dense urban area in Wu- hart, China. Small-scale channel characteris- tics including power delay profile, amplitude fading distribution, K-factor, delay spread and Doppler shift were obtained, respectively. Spe- cifically, the cumulative distribution function of root mean square delay spreads and root mean square Doppler spreads in the non-con- gested scenario and congested scenario were all fitted well with Lognormal distribution. We also found out that different intensity of traffic and speed of vehicles have little effect on root mean square delay spreads, but have a big im- pact on root mean square Doppler spreads and level crossing rate. According to estimation outcomes, the V2V channel characteristics for urban areas in Chinese big city were differ- ent from the previous measured results under similar scenarios in Europe. Delay spread and level crossing rate in this study can provide significant references to design the wireless communication system for vehicle-to-vehicle channel.展开更多
文摘试验背景目前,欧盟地区的隧道内防火与逃生系统都是基于对人类平均反应时间和步行速度的假设而设置的,但针对隧道火灾中的人类个体行为和人群的群体动态效应却鲜有研究。在欧洲,由于法律原因,研究团队很难获得真实的隧道火灾视频记录用于研究人类行为。鉴于此,德国联邦数字和交通部(BMDV)和联邦公路研究所(BASt)联合弗莱堡大学(University of Freiburg)和奥地利莱奥本大学(University of Leoben)针对这一课题进行试验研究,试图了解隧道火灾中真实的人类个体行为和群体效应,并通过获得的数据评估目前的公路隧道设计标准是否需要更新。
基金supported by Norwegian Research Council(No.256309)supported by an International Cooperation Project:5G-Channel Measurement and Channel Modeling for Ocean Scenario(No.20172h0046)+3 种基金Hubei college excellent young science and technology innovation team project:Fast Varying Channel Modeling and Analysis(No.T201736)Young Scientists Found of National Natural Science Foundation of China(No.61701356)Fundamental Research Funds for the Central Universities(No.2017-JL-004)(China Scholarship Council) CSC agency for funding and the Super Radio AS
文摘This study focused on differences in vehicle-to-vehicle radio channel character- istics in the same region but different traffic density and speeds at 5.9 GHz （congestion and non-congestion）. The continuous measurement campaign was conducted on a city expressway through the complex dense urban area in Wu- hart, China. Small-scale channel characteris- tics including power delay profile, amplitude fading distribution, K-factor, delay spread and Doppler shift were obtained, respectively. Spe- cifically, the cumulative distribution function of root mean square delay spreads and root mean square Doppler spreads in the non-con- gested scenario and congested scenario were all fitted well with Lognormal distribution. We also found out that different intensity of traffic and speed of vehicles have little effect on root mean square delay spreads, but have a big im- pact on root mean square Doppler spreads and level crossing rate. According to estimation outcomes, the V2V channel characteristics for urban areas in Chinese big city were differ- ent from the previous measured results under similar scenarios in Europe. Delay spread and level crossing rate in this study can provide significant references to design the wireless communication system for vehicle-to-vehicle channel.
