Reserch Of On-board ATP Of CBTC System In The Urban Rail Transit

With the ascendant development of urban rail transit,the research and engineering practice of CBTC(Communication Based Train Control)system has reached a new period.At present,China's CBTC system researches have gradually freed from adopting foreign technology,and contrarily stepped into a process of autonomy of intellectual property,technology localization and industry innovation.As the core subsystem of CBTC system,the research and optimization of ATP system is the frontier position of urban rail transit signal system research.Based on its characteristics and implementation techniques,the related functions of the ATP on-board system are studied.Firstly,the composition and function of the ATP on-board system are described,and the key technologies of the onboard ATP are described from such three aspects as train speed and displacement determination,train location management,and train tracking interval management.The technical difficulties of the ATP system are explained from two aspects: the improvement of velocity precision and the moving block of ATP safety braking model.Secondly,the existing ATP velocity measurement method is simple and has low speed measurement,so a speed measurement method based on information fusion is provided.By applying different methods for speed measurement fusion of different ATP speed measurement equipments,an ATP speed fusion scheme based on SVM is finally proposed,which is based on SVM's off-line training and on-line estimation,and its speed fusion results can better improve the speed precision.Thirdly,the current train is of simple tracking safety interval management and low efficiency,therefore,a tracking safety braking model of classical trains is studied,and based on the model,an optimization model for considering the speed of the vehicle ahead and the optimal braking distance is presented.And the usability of the optimization model is analyzed from different aspects.The analysis results show that the optimization model can meet the requirements of train running safety,which are available and compatible with the existing model.Finally,in view of the SVM-based velocity measurement scheme,the speed fusion simulation test platform is designed,and the function and framework of the platform are analyzed and described.In addition,the platform software is designed and is provided with a field test.Experiments show that the simulation test platform can meet the requirements of speed fusion.