WiFi-Bluetooth Dual Modal Indoor Positioning System Using Adaptive Range Filter

The ubiquitous Global Positioning System (GPS) provides great convenience for people’s outdoor activities but failed to fulfill the requirements of indoor positioning. Therefore, different technologies, such as WiFi and Bluetooth, are researched and applied to provide solutions for indoor scenarios. In this paper, we developed a WiFi-Bluetooth dual-modal indoor positioning system that uses WiFi for communication and Bluetooth Low Energy (BLE) for positioning. To balance accuracy and power consumption and mitigate the noise caused by the external environment, a range-based filter is proposed to enhance the multilateration result. Experiments are carried out in real environments and simulations based on ns-3 are also developed for repeatability. The result shows that our work gives 90% of accuracy for locating objects with 1-meter precision which can meet the requirements of indoor positioning.