Study Of Taxi Radio Location In City

Radio location technology is an old but young technology. Location usually means that the position of a certain object at the earth surface is confirmed in the system of a certain reference coordinates. Radiolocation means through collecting and analyzing relevant network datum, to confirm geographical position information (longitude and latitude coordinate) in the public land mobile communication network (PLMN). Through geographical information system processing platform, we could in correct time, correct place, send correct message to correct people, and could realize monitoring and tracking the position of.the end user in real time.With the constant development of city electronic map in the geographical information system and GSM telecommunication technology, it is possible to develop a taxies management platform in city, to realize intellect management of the taxi call, charge and management etc.This text has discussed basic method and principle of the radiolocation: Calculating method, approaching method and radiolocation. It has Discussed GPS navigation and position system, analyzed and compared their advantages and disadvantages.This text has discussed GSM network parameters used for location in detail, analyzed the structure of cell, the switching over of the location information, the working concept of the channel.Utilizing GSM network, there are many ways to realize radiolocation to the urban taxi. The localization technologies include: scene analyses, relative location technology, COO (Cell of Origin) location, Cell-ID and time advances of arrive, STK (SIM Application Toolkit) method, the intensity of signal location, etc. This text analyses the technological characteristics of different methods, compares their pluses and minuses.Actually, the propagation of electromagnetic wave is very complicated in the city. It is very difficult to meet the user request by adopting a single technology. This text has proposed adopting the location method of multi-method, multi-precision. According to the position of a taxi, it can choose location algorithm to meet the request. It has discussed the diagram of the system, system component, and tasks that every part should be finished.This text has also discussed the RFID technology, its operation principle, and the application in the administrative system of expressway. It has put forward a management mode in which it is need not to stop for charging.