Authors:
Pawel Gburzynski
1
;
Wlodek Olesinski
2
and
Jasmien Van Vooren
3
Affiliations:
1
Vistula University, Olsonet Communications Corporation and Sendronet, Poland
;
2
Olsonet Communications Corporation, Canada
;
3
Alphatronics, Belgium
Keyword(s):
Wireless Sensor Networks, Real-time Location Tracking, Ad-hoc Networking.
Related
Ontology
Subjects/Areas/Topics:
Data Communication Networking
;
Network Applications (Web, Multimedia Streaming, Gaming, Etc.)
;
Network Protocols
;
Sensor Nets and Embedded Systems
;
Telecommunications
Abstract:
We present an indoor location tracking system (RTLS) based on a wireless sensor network (WSN) where
the received signal strength (RSS) readings collected by immobile nodes (Pegs) from mobile (tracked) nodes
(Tags) are translated into location estimates for the Tags. The process employs a database of samples previously
collected from known locations; thus, the scheme falls into the category of profile-based solutions,
with RSS readings being the only kind of input to the estimator. Compared to other schemes hinged on the
same general idea, the novelty of our approach consists in systematically taking advantage of multiple transmit
power levels at the Tags. This allows us to effectively emulate RFID-type of operation, when a nearby Peg
can authoritatively identify the location by perceiving a weak signal from the Tag (indicative of the Tag’s immediate
proximity), while otherwise falling back to elaborate fitting of multiple readings (collected by several
Pegs) to produce a (possibly ap
proximate) location estimate. The location service of our network is an add
on to its other duties which consist in providing connectivity within an independent living (IL) facility for the
purpose of inconspicuously monitoring the patients, detecting anomalies, signaling alarms, and so on.
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