Abstract
Wireless node localization is one of the key technologies for wireless sensor networks. Outdoor localization can use GPS, AGPS (Assisted Global Positioning System) [6], but in buildings like supermarkets and underground parking, the accuracy of GPS and even AGPS will be greatly reduced. Since Indoor localization requests higher accuracy, using GPS or AGPS for indoor localization is not feasible in the current view. RSSI-based trilateral localization algorithm, due to its low cost, no additional hardware support, and easy-understanding, it becomes the mainstream localization algorithm in wireless sensor networks. With the development of wireless sensor networks and smart devices, the number of WIFI access point in these buildings is increasing, as long as a mobile smart device can detect three or three more known WIFI hotspots’ positions, it would be relatively easy to realize self-localization (Usually WIFI access points locations are fixed). The key problem is that the RSSI value is relatively vulnerable to the influence of the physical environment, causing large calculation error in RSSI-based localization algorithm. The paper proposes an improved RSSI-based algorithm, the experimental results show that compared with original RSSI-based localization algorithms the algorithm improves the localization accuracy and reduces the deviation.
Highlights
More than 80% information is related to spatial location, and modern people spend about 80% - 90% time of their whole life indoors
The key problem is that the RSSI value is relatively vulnerable to the influence of the physical environment, causing large calculation error in RSSI-based localization algorithm
Easy-understanding and low cost, RSSI-based trilateral localization algorithm has a wide range of applications
Summary
More than 80% information is related to spatial location, and modern people spend about 80% - 90% time of their whole life indoors. Along with the rapid development of wireless networks and smart phones, the number of WIFI access points increase dramatically and most WIFI access points’ locations are fixed. New direction for indoor localization research in wireless sensor network. Existing wireless localization algorithms require either special hardware support or complex computing, which consuming valuable battery resources greatly, especially comes to smart phones or sensors. The contribution of this paper is that it proposed a new algorithm,which increase the indoor localization accuracy without any additional hardware support or increasing the computational complexity
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