| Bluetooth is an open wireless local network protocol. It provides the possibility for RF connection of speech sound and data transmission of information equipments in limited distance. This technology replaces the dependency of equipment on cable. At the same time, it can make connection equipments into network model and thus work properly. The most important reason for the widespread attention on bluetooth is that it is the global standard for wireless connection. Its formulation is based on its replacement of cable, simple operation, and stability. These requirements not only impose new many challenges, but also supply a good number of opportunities. This technique employs FHSS, and its design demands minimum assumption, lowest cost and superior property of anti-interference. It includes RF unit, baseband CCU, connection software, and some respective super functional software. According to statistics from the Ministry of Communications, by the end of the year 1998, all over the country, there are 3112 road charge posts, 95209 miles of charge line, 433779 charge tunnels and 155000 charge personnel. It is predicted that by the year 2005, these data will double. When the vehicles pass through the charge posts, they have to slow down; making the charge posts the neck of charge roads. Therefore, there are frequent traffic jams, even accidents. The road charge system in our country has formed into a large network, thus ways of charge and management seem more and more important. The MFC is quite slow, and greatly affects the traffic capacity of the charge posts. As a result, the ETC is a very good solution. The bluetooth wireless charge system is quite an advanced fee-charging system. It employs highly developed bluetooth technique, which greatly improves the management ability of Charge Company, as well as the traffic capacity. Hence, it puts an end to the crowding situation caused by the halting vehicle queues. It is free of artificial charge, exempt from cash and charge and stopping to wait as well, according, it benefits the road users a lot. Besides, it is good for financial management of every unit; consequently, it can stop corrupt practice once and for all. Compared to other accessible charge system, its cost is extremely low; therefore, it will have great competition in the future and existing system reforms. Its characteristics are: Advanced system. The bluetooth RF omnidirectional wireless signal can discern ID numbers, vehicle types, classifications and parameters and such information as words and pictures. It has the function of two-way communication and information alteration. So it can inform the drivers of specific charging fees of every time, shorten the time of parking when vehicles go in and out of highways. The speed of passing is thus heightened by four to six times compared to the manual charge roads.Safe working. The measures of encrypt and assessment brings about the safe management of data, and high reliability of system.Simple operation. The whole charge system adopts friendly window and menu preface. Therefore, non-professional people can also easily learn the performance of each system.Realization of scientific management of municipal facilities. The replacement of electrical money on cash, early warning and distribution of traffic lanes bring a lot of benefits to road users and traffic management system. The combination of ETC and settlement on accounts automatically provide the management department with records of exceeding the speed limit of vehicles, information of annual inspection, fee-paying, and the drivers' breaking –out of traffic regulations.To complete this subject, we make an extensive research on the protocol standard of 1.0 edition made public by Bluetooth SIG in 1999 and the latest 1.2 edition published in 2003 Furthermore, we have a deep understanding of bluetooth group network models, the important computation of baseband. With reference to bluetooth standard, with use of bluetooth model produced by Ericsson. We design the non-stop charge system...
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