It is common to have an indoor positioning system that read receive signal strength from Wi-Fi access point and locates the mobile devices. However Wi-Fi signal may be unavailable due to unreachable-coverage and obstacles. Therefore, it is more robust if a hybrid indoor positioning system utilises two or more wireless communication facilities to locate the mobile device. In this project, a hybrid framework is proposed and its usability is the main concern. The proposed hybrid framework measures received signal strength from both Wi-Fi and Bluetooth signals to locate the mobile device. While the framework is running, it is able to wisely switch from one method to another depending on the availability and signal quality of the wireless signals. In the situation where there are two sources of connection, the best one is used for positioning. The hybrid framework has been tested in different deployments of Wi-Fi access points to research on its usability. The test results show that, Wi-Fi positioning is suitable to implement in large open area where there is very little obstacles, while Bluetooth positioning is suitable for small are and covered with walls.
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