计算机工程
計算機工程
계산궤공정
COMPUTER ENGINEERING
2013年
12期
5-10
,共6页
超短波%列车间直接通信%路径损耗%通信链路%衰落%多径传播
超短波%列車間直接通信%路徑損耗%通信鏈路%衰落%多徑傳播
초단파%열차간직접통신%로경손모%통신련로%쇠락%다경전파
ultrashort wave%train-to-train direct communication%path loss%communication link%fading%multipath propagation
铁路区间内列车间的通信通过轨道电路和基站间接实现，较多的通信环节易影响系统的可靠性，引发铁路交通安全问题。为此，针对铁路新避撞系统，提出基于超短波的列车间直接通信方案。通过理论分析证明方案的可行性，并给出超短波工作频段、列车间最大通信距离及收/发信机结构。分析列车间直接通信的通信链路，给出车站及区间列车运行场景中通信链路路径损耗的预算模型，同时结合接收功率的相关数值计算及仿真，验证该方案的可实现性。根据列车运行环境的特点，对通信链路中的衰落进行讨论，结果表明，多径传播和多普勒效应会造成信号严重衰落。
鐵路區間內列車間的通信通過軌道電路和基站間接實現，較多的通信環節易影響繫統的可靠性，引髮鐵路交通安全問題。為此，針對鐵路新避撞繫統，提齣基于超短波的列車間直接通信方案。通過理論分析證明方案的可行性，併給齣超短波工作頻段、列車間最大通信距離及收/髮信機結構。分析列車間直接通信的通信鏈路，給齣車站及區間列車運行場景中通信鏈路路徑損耗的預算模型，同時結閤接收功率的相關數值計算及倣真，驗證該方案的可實現性。根據列車運行環境的特點，對通信鏈路中的衰落進行討論，結果錶明，多徑傳播和多普勒效應會造成信號嚴重衰落。
철로구간내열차간적통신통과궤도전로화기참간접실현，교다적통신배절역영향계통적가고성，인발철로교통안전문제。위차，침대철로신피당계통，제출기우초단파적열차간직접통신방안。통과이론분석증명방안적가행성，병급출초단파공작빈단、열차간최대통신거리급수/발신궤결구。분석열차간직접통신적통신련로，급출차참급구간열차운행장경중통신련로로경손모적예산모형，동시결합접수공솔적상관수치계산급방진，험증해방안적가실현성。근거열차운행배경적특점，대통신련로중적쇠락진행토론，결과표명，다경전파화다보륵효응회조성신호엄중쇠락。
The trains in the railway section communicate with each other by track circuit or base station indirectly, which has too many nodes and low reliability, also brings safety risk. In order to realize direct communication of train-to-train and the need of railway collision avoidance system, the train-to-train direct communication scheme is proposed, the ultrashort wave band, the maximum communication distance between trains and the structure of transceiver are selected for railway application requirements, also the feasibility of this technology is described. The link of the direct train-to-train communication is analyzed, the budget model of path loss of station and section are given, the calculated results under different conditions of the receiver power also with simulation are illustrated. Analysis result shows that the proposed technology can be realized. The fading in communication link is discussed with the character of train running environment, the result shows that the multipath propagation and Doppler effect lead to serious signal fading.
