The Design And Research Of Integrated Location System Based On CNSS/RFID

With the rapid development of integration of the world, the industry of traffic and communication has taken off, the range of people’s life has expanded and the desire of control of location information has become stronger. The application of location information has permeated from military and politics of countries into all walks of life. Presently, the Global Navigation Satellite System is widely applied, especially for GPS. However, the satellite system can’t realize indoor location entirely or outdoor and indoor location seamlessly because of its technical characteristics. For this problem, this article designs an integrated location system, which can realize outdoor positioning, and indoor positioning in some range seamlessly.The GPS, which being owned by the United States, has been widely applied. The system is mature and reliable. However, for users of our country, the technology is subject to the United States, because the satellites and technology are full controlled by the United States. The Compass Navigation Satellite System (CNSS), which is owned by our country, has been working and is gradually improving, which can be compared to GPS. The kind of location chips for CNSS has been gradually increasing at present, and the products of chips have moderate cost and proprietary intellectual property rights. In this article, the design chooses a CNSS chip, which has functions of location, timing and SMS communication.For indoor location system, there are WIFI, RFID and infrared location systems and so on. In this article, the design chooses the RFID indoor location system that has low cost, wide application and easy setting. The technologies of RFID for locating have many kinds. In this article, the design uses the method of using mobile readers to detect fixed tags to locate the positions of targets. The tags, which have small dimensions and low costs, are placed indoor in certain positions, and every tag matches unique geographic position. When the terminal moves in the range of a tag, the terminal communications with the tag and gets the ID of the tag, then the data of the ID will transmit to the server, which can realize the locating for the terminal through algorithms of feature matching and data fusion.The design in this article has two parts, which are mobile terminals and the server. The mobile terminals which contain location module, communication module, display module and so on, use STM32core hardware platform and Keil software platform to design. The terminals can achieve functions of acquisition of CNSS location data and RFID data, timing for server, communication with the server and display. The server software uses Visual Studio platform to design. The server software which is actually a monitoring platform, can achieve functions of communication with terminals, processing of location data, realization and switchover of location algorithms and storage of data. The platform which integrates Baidu electronic map, can realize functions of monitoring of terminals, querying historical location data and replaying tracks. Users can use the platform to monitor the terminals intuitively and expediently.