Research on Indoor Positioning System Based on BLE-AOA/ UWB Technology

With the development of modern industrialization, intelligence and the rise of the Internet of Things, people's demand for indoor positioning services is increasing. Different from the outdoor environment, the indoor environment contains different types of obstacles, and different obstacles have different absorption rates of transmitted signals, so the implementation of indoor positioning system becomes more difficult. Indoor positioning technologies include frequency identification (RFID), WiFi, Bluetooth Low Energy (BLE), infrared, 5G cellular, image recognition, ultrasonic, ultra-wideband (UWB) and so on. This study analyzes and compares the advantages, disadvantages and research status of several mainstream single technology positioning, and concluded that the positioning of single technology inevitably has limitations. According to the positioning accuracy, the positioning technology is divided into two categories for comparison. The best technology is selected respectively, and the complementary technology fusion scheme is proposed to solve the shortcomings of single technology. In this paper, the UWB subsystem and BLE angle of arrival (AOA) direction finding subsystem are integrated and positioned, and the algorithms of each subsystem are optimized. The method of distance measurement and direction finding is combined to realize high-precision positioning with one UWB base station and one BLE base station. Finally, a fusion positioning system based on BLE-AOA and UWB is built. After experimental analysis, the positioning accuracy of the system can reach sub-meter level.