train length status reflects whether the carriage is uncoupled or thrown away, it directly affects the safety and efficiency of train operations. At present, satellite positioning technology is used within a train len...
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train length status reflects whether the carriage is uncoupled or thrown away, it directly affects the safety and efficiency of train operations. At present, satellite positioning technology is used within a train length monitoring system. Such a system can ensure positioning accuracy while reducing the need for trackside equipment. For train length monitoring using GNSS technology, multi-constellation can utilize more visible satellites and achieve better spatial geometric distribution. A robust train length calculation method using multi-constellation GNSS moving-baseline positioning resolution is proposed. The time and space coordinate systems of the Global Positioning system (GPS) and BeiDou Navigation Satellite system (BDS) are unified as the foundation to realize multi-constellation positioning. Double-differenced carrier phase measurements are used to mitigate or eliminate the propagation errors and the satellite and receiver clock errors. Then, the moving-baseline length can be estimated using a Kalman filtering algorithm, and the carrier phase ambiguity terms are fixed using an online ambiguity fix algorithm to further improve the system performance. More measurements are utilized in the multi-constellation train length calculation method, the probability of fault measurement would be increased thereafter, and thus, the fault identification and adaptive filtering algorithm is introduced in the multi-constellation train length calculation to reduce the influence of fault measurement on the accuracy of moving-baseline solution and enhance the robustness of the system. To evaluate the performance of the proposed system, an experiment was conducted on the Beijing-Shenyang high-speed railway line. The results obtained on GPS-FLOAT, GPS-FIX, GPS/BDS-FLOAT, and GPS/BDS-FIX modes were compared. Both the FLOAT and FIX solutions can achieve the train length computation with sub-meter level accuracy, which can prove that the system is able to be adapt to the different
In the study of the nextgeneration of CBTC system,the ground equipment is simplified as the object controllers,so the train-ground communication based on TD-LTE technology is put ***,it uses deterministic and stochas...
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ISBN:
(纸本)9781509059294
In the study of the nextgeneration of CBTC system,the ground equipment is simplified as the object controllers,so the train-ground communication based on TD-LTE technology is put ***,it uses deterministic and stochastic Petri net to establish communication model,and uses TimeNET4.0 to simulate the model,then a conclusion can be concluded that the greater the number of object controllers for communication,the lower the successful rate of receiving,the longer the delay of *** the train gets closer to the base station,as the quantity of object controllers increases,the successful rate of receiving changes more slowly and the trend of delay also changes more *** the worst case,when the rate of receiving data successfully can reach 99.9%,the number of object controller which can communicate with train at the same time is less than or equal to *** the delay is less than 100 ms,the number of object controllers which can communicate with train at the same time is less than *** the plan which is overlying wired network with wireless network is used,the reliability is higher,the communication delay is smaller.
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