| With the increasing development of technology, people are increasingly seeking an automated, user-friendly, intelligent life.High tech products can be seen everywhere in our life. Jobs launched a series of products which has great impact to the market in Apple. So humane, intelligent, close to the user’s electronic products completely changed our habits. People do not have to rack their brains to learn how to use a piece of software, do not have to read the whole library to verify a theorem, do not have to stay in front of computer all day to manipulate stock which change rapidly, do not have to walk through several street to take a taxi. Because of technology, the resources of whole society allocate more rational, allows customers and sellers closer together. I am involved in research and development of indoor and outdoor positioning system is also designed to provide a more automated, user-friendly, intelligent location-related services. Hope that through the mobile terminal allows users to quickly and easily manage massive logistics, special personnel, and vehicle systems.Positioning area in system is divided into indoor and outdoor. Outdoor positioning system is mainly depended on our self-developed second-generation Beidou satellite system and GPS system. Indoor positioning system is mainly depended on RFID radio frequency devices and through Wifi. The two different positioning systems can switch freely and intelligently is the biggest feature of the entire system in order to meet the demand for more humane.RFID is the core of indoor positioning. At home and abroad in RFID indoor positioning, LandMark and its improved algorithm Vire can not meet the real-time because of the complex calculation, so it has not been wildly used. Aiming to improve positioning in real time, in the original algorithm, to its dregs, its essence. In the new system, without having to adjust the transmit power of the reader antenna, the detectable label is also not required to provide RSSI(Received Signal Strength Indicator).Using the appropriate location of RFID readers to improve positioning accuracy. Using different combinations of detect results to determine the position of the detection range of the tag. Ensuring real-time basis, to improve accuracy.This paper compares the simulation of two different distribution models, triangle distribution model and square distribution model. Compare the accuracy of the model in different distances of location of the RFID readers. According to the simulation results, three schemes are given to meet different needs:highest accuracy, most economical reader and highest efficiency. The average positioning error is controlled under1/5of the detection distance and ensuring the premise of real-time. |
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