Indoor localization is used in many applications like security, healthcare, location based services, and social networking. Fingerprinting-based methods are widely used for indoor localization. But received signal strength (RSS) variation due to device diversity and change of conditions in the localization environment (e.g., distribution of furniture, people presence and movement, and opening and closing of doors) induce a significant localization error. To overcome this, we propose a hybrid indoor localization system using radio frequency (RF) and pyroelectric infrared (PIR) sensors. Our localization system has two stages. In the first stage, the zone of the target person is identified by PIR sensors. In the second stage, we apply K-nearest neighbor (K-NN) algorithm to the fingerprints within the zone identified and estimate position. Zone based processing of fingerprints will exclude deviated fingerprints because of RSS variation. We proposed two localization methods: Proposed 1 and Proposed 2 which use signal strength difference (SSD) and RSS, respectively. Simulation results show that the 0.8-meter accuracy of Proposed 1 achieves 84% and Proposed 2 achieves 65%, while traditional fingerprinting and SSD are 46% and 28%, respectively.
For example, the authors of REF proposed a hybrid approach of radiofrequency and pyroelectric infrared (PIR) sensors.
Hybrid Indoor Human Localization System for Addressing the Issue of RSS Variation in Fingerprinting
International Journal of Distributed Sensor Networks
Computer Science