Even though GPS systems and many mobile positioning technologies have achieved great success in outdoor positioning application services, in complex indoor environments, such as airport halls, exhibition halls, warehouses, supermarkets, libraries, underground parking lots, mines, etc. performance is less than satisfactory. Taking the GPS system as an example, when positioning indoors, the positioning failure or the positioning error is too large due to the inability to receive satellite signals, so that the system cannot be used normally. In order to make up for the blank of indoor positioning, a variety of novel indoor positioning technologies have sprung up, including indoor GPS positioning technology, indoor wireless positioning technology (Wi-Fi, Bluetooth, RFID, light tracking, ultrasonic, infrared , ultra-wideband, wireless sensors, etc.) and computer vision positioning technology.

　　Although the commercial application of indoor positioning technology is just in its infancy, with the continuous advancement and development of technology and the combination with existing positioning technology and commercial services, it will be able to create new markets and business opportunities, and its related location Service business will also be deeply embedded in people's lives.

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