Gps-based Positioning Intelligent Public Transportation Service System Research And Design,

The transportation system in China is experiencing rapid development. Even the Intelligent Automatic Transportation System has been applied in commercial transportation. But the public transportation system, which plays a major part in the city transportation service, is still running in the traditional way. In this thesis, an Intelligent Public Transportation Service System based on GPS (Global Positioning System) technology is studied and designed, including the in-bus terminal and electronic stop board. In the system, a bus locates its position through GPS technology and triggers the in-bus terminal to work automatically, for instance, reporting the bus stop without pressing the keys. The bus keeps synchronous communication with the Control Center by GPRS, reporting its position and conditions to the Control Center and receiving commands from the Control Center and responding accordingly. And the Control Center sends such information as the position of the bus to the corresponding electronic stop board, which then updates its information on screen. In this way, the system completes its work automatically. It close relates with the life most of drivers and passengers.The thesis discusses the Intelligent Public Transportation Service System (IPTSS) in three parts.Firstly, GPS technology as the basis of IPTSS to implement automatic positioning and other intelligent automatic services. This part introduces in detail about GPS positioning mechanism, and also proposes some common ways of compensation for the possible loss when GPS is affected by geographic circumstance factors.Secondly, the study and design of the hardware and the software of in-bus terminal in IPTSS. C51 microprocessor is used as a core of the in-bus terminal. This part mainly discusses the hardware functions of the major modules, the principles of choosing units, and the design of electronic circuits in the MCS control system.The software is edited by C program language. This part analyzes the system functions on a practical basis, and describes the design of the software, including main program, key module and interrupt program,which keeps traditional keystroke stop reporting in case the automatic stop reporting system fails to work, and the design of the system which bears the capacity of self-learning.Thirdly, the study and design of the electronic stop board. This part explains the operational principles of the electronic stop board, and introduces some common units and the principles of choosing them.To sum up, a whole set of Intelligent Public Transportation Service System is completed, and it has been debugged and installed with its software work platform constructed, which is easy to operate.