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A Hybrid BLE/UWB Localization Technique with Automatic Radio Map Creation

Localization systems intended for home use by people with mild cognitive impairment should comply with specific requirements. They should provide the users with sub-meter accuracy allowing for analyzing patient's movement trajectory and be energy effective, so the devices do not need frequent charging. Such requirements could be satisfied by employing a hybrid positioning system combining accurate UWB with energy efficient Bluetooth Low Energy (BLE) technology. In the paper, such a solution is presented and experimentally verified. In the proposed system, user's location is derived using BLE based fingerprinting. A radio map utilized by the algorithm is created automatically during system operation with the support of UWB subsystem. Such an approach allows the users to repeat system calibration as often as possible, which raises systems resistance to environmental changes.

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