The Design Of Public Transport Recharge System Based On Smart Phone

Public transport recharge system is an important part of public transport.The existing public transport recharge system is dominated by manual recharge.This approach requires people to recharge at a specific time and place.Especially during peak periods,people need to line up long for recharge.It not only wastes a lot of time,but also seriously affects people's travel.With the growing popularity of smart phone and NFC technology,the use of smart phone for public transport card recharge is the future development tendency.This paper studies the public transportation card recharge system based on smart phone.According to whether the smart phone can communicate directly with the public transport card,this system has two different realization methods,one for NFC smart phone and the other for non-NFC smart phone.The system for the people whose mobile phone support NFC,people can get the public transport card information directly through the mode of read and write.Then people through a third party payment agency to achieve payment according to the public transport card information.When payment is finished,the background server returns the write command to NFC smart phone.At last,the NFC smart phone sends the write command to the public transport card through the read and write mode of NFC.It makes recharge more convenient and efficient.The system for the people whose mobile phone don't support NFC has two parts,one is smart phone recharge part,the other is public transport card retro part.Smart phone recharge part is to design APP,the user choose the city of public transportation card in smart mobile phone app,enter the card number and the recharge amount,then choose payment method to pay.Public transport card retro part is to design retro reader.The reader consists of controller module,read and write module,communication module and display module.The reader sends the public transport recharge card information to the background server,the background server checks if there is a payment order.If exits,the background server sends the write command to the retro reader,then the retro reader sends the write command to public transport card,completing recharge.At last,in order to ensure the safety and reliability of public transport recharge system,we design the security of data transmission between public transport card and retro reader,the security of data transmission between mobile phone and background server,the security of data transmission between retro reader and background server based on SHA signature algorithm and MAC signature algorithm in order to ensure the safety of the system.This public transport recharge system can improve the existing public transport recharge system.Let public transport recharge system adapt to the development of public transport system.This system can provide convenience for citizens' quick and convenient travel,lay a solid foundation for enhancing the city's comprehensive service capabilities and promote the development of urban public transport effectively.