Indoor positioning system and method

The invention relates to an indoor positioning system. Digital processing is conducted on each high-rise building, a three-dimensional model view is built in each room of each floor, a digital model is built for each building, an RFID label is arranged at a gate of stairs of each floor, and the ID numbers of the RFID labels and the floors and the positions where the RFID labels are located are stored in a database system. The indoor positioning system comprises the RFID labels for positioning the start points and activating mobile terminals to start to collect data, a plurality of mobile terminals and a background server. The mobile terminals are used for collecting the indoor environment information and the precise positions in the rooms, transmitting the indoor information to the background server, coding and decoding the input audio information, transmitting the processed information to the server, coding and decoding the received audio information and broadcasting the audio information. The background server is used for receiving data sent by the mobile terminal, integrating the received data, displaying the digital model of whole building through three-dimensional software on the server and mapping the integrated data into the digital model. The system is simple in structure, convenient to use and high in precision.