全球定位系统(Global Position System,GPS)技术凭借精准定位、实时监测、数据记录与分析等优势,在贵南高速铁路建设中发挥着关键作用,成为不可缺少的工具。竣工图是高速铁路建设的重要资料。随着现代经济社会的发展,越来越多的高速铁...全球定位系统(Global Position System,GPS)技术凭借精准定位、实时监测、数据记录与分析等优势,在贵南高速铁路建设中发挥着关键作用,成为不可缺少的工具。竣工图是高速铁路建设的重要资料。随着现代经济社会的发展,越来越多的高速铁路项目正在建设中,竣工图作为对高速铁路进行验收、运营、维护和改造的可靠依据,在整个工程中起着至关重要的作用。通过对贵南高速铁路(贵州段)竣工图的测量,重点探讨GPS技术在贵南高速铁路竣工测量中GPS的控制网布设、观测及后期数据处理和平差计算等内容。展开更多
A non-linear regression model is proposed to forecast the aggregated passenger volume of Beijing-Shanghai high-speed railway(HSR) line in China. Train services and temporal features of passenger volume are studied to ...A non-linear regression model is proposed to forecast the aggregated passenger volume of Beijing-Shanghai high-speed railway(HSR) line in China. Train services and temporal features of passenger volume are studied to have a prior knowledge about this high-speed railway line. Then, based on a theoretical curve that depicts the relationship among passenger demand, transportation capacity and passenger volume, a non-linear regression model is established with consideration of the effect of capacity constraint. Through experiments, it is found that the proposed model can perform better in both forecasting accuracy and stability compared with linear regression models and back-propagation neural networks. In addition to the forecasting ability, with a definite formation, the proposed model can be further used to forecast the effects of train planning policies.展开更多
Based on the analysis of the impact of Doppler shift to the railway dedicated mobile communication quality under the condition of high-speed mobility,this paper presents a Doppler shift measurement approach based on t...Based on the analysis of the impact of Doppler shift to the railway dedicated mobile communication quality under the condition of high-speed mobility,this paper presents a Doppler shift measurement approach based on the phase estimation of frequency correction channel(FCCH) which correctly reflects the time-varying characteristic of the channel with a testing system developed.The Doppler shift data under the high-speed condition is collected,processed,analyzed,and compared with the simulation results.The scientific laws of the Doppler shift distribution of radio channel under high-speed condition are obtained.These data and analysis are essential for the establishment of high-speed railway Doppler power spectrum model and the development of the key technology of antiDoppler shift.展开更多
文摘全球定位系统(Global Position System,GPS)技术凭借精准定位、实时监测、数据记录与分析等优势,在贵南高速铁路建设中发挥着关键作用,成为不可缺少的工具。竣工图是高速铁路建设的重要资料。随着现代经济社会的发展,越来越多的高速铁路项目正在建设中,竣工图作为对高速铁路进行验收、运营、维护和改造的可靠依据,在整个工程中起着至关重要的作用。通过对贵南高速铁路(贵州段)竣工图的测量,重点探讨GPS技术在贵南高速铁路竣工测量中GPS的控制网布设、观测及后期数据处理和平差计算等内容。
基金Project(2014YJS080) supported by the Fundamental Research Funds for the Central Universities of China
文摘A non-linear regression model is proposed to forecast the aggregated passenger volume of Beijing-Shanghai high-speed railway(HSR) line in China. Train services and temporal features of passenger volume are studied to have a prior knowledge about this high-speed railway line. Then, based on a theoretical curve that depicts the relationship among passenger demand, transportation capacity and passenger volume, a non-linear regression model is established with consideration of the effect of capacity constraint. Through experiments, it is found that the proposed model can perform better in both forecasting accuracy and stability compared with linear regression models and back-propagation neural networks. In addition to the forecasting ability, with a definite formation, the proposed model can be further used to forecast the effects of train planning policies.
基金Supported by the National Natural Science Foundation of China(No.U133420261222105)+1 种基金the Key Grant Project of Chinese Ministry of Education(No.313006)the Project of State Key Lab of Rail Traffic Control and Safety(No.RCS 2014ZT11)
文摘Based on the analysis of the impact of Doppler shift to the railway dedicated mobile communication quality under the condition of high-speed mobility,this paper presents a Doppler shift measurement approach based on the phase estimation of frequency correction channel(FCCH) which correctly reflects the time-varying characteristic of the channel with a testing system developed.The Doppler shift data under the high-speed condition is collected,processed,analyzed,and compared with the simulation results.The scientific laws of the Doppler shift distribution of radio channel under high-speed condition are obtained.These data and analysis are essential for the establishment of high-speed railway Doppler power spectrum model and the development of the key technology of antiDoppler shift.
