1,246 research outputs found
Intelligent beacon location and fingerprinting
The complex way radio waves propagate indoors, leads to the derivation of location using fingerprinting techniques. In this cases, location is computed relying on WiFi signals strength mapping. Recent Bluetooth Low Energy (BLE) provides new opportunities to explore positioning. Indoor location identification plays a fundamental role as a business and personal level. At a business level, indoor location pinpointing where GPS signal is nonexistent is used to advise users and send push notifications (e.g., stores publicity, guide persons with special needs, or even for emergency evacuation). In this work is studied how BLE beacons radio signals can be used for indoor location scenarios, as well as their precision. The proposed study is performed inside the campus of Viseu Polytechnic Institute, using hundreds of students, each with his smart-phone, as proof of concept. Experimental results show that BLE allows having less than 1.5 meters error approximately 90% of the times.info:eu-repo/semantics/publishedVersio
Indoor Positioning for Monitoring Older Adults at Home: Wi-Fi and BLE Technologies in Real Scenarios
This paper presents our experience on a real case of applying an indoor localization system formonitoringolderadultsintheirownhomes. Sincethesystemisdesignedtobeusedbyrealusers, therearemanysituationsthatcannotbecontrolledbysystemdevelopersandcanbeasourceoferrors. This paper presents some of the problems that arise when real non-expert users use localization systems and discusses some strategies to deal with such situations. Two technologies were tested to provide indoor localization: Wi-Fi and Bluetooth Low Energy. The results shown in the paper suggest that the Bluetooth Low Energy based one is preferable in the proposed task
Distributed and adaptive location identification system for mobile devices
Indoor location identification and navigation need to be as simple, seamless,
and ubiquitous as its outdoor GPS-based counterpart is. It would be of great
convenience to the mobile user to be able to continue navigating seamlessly as
he or she moves from a GPS-clear outdoor environment into an indoor environment
or a GPS-obstructed outdoor environment such as a tunnel or forest. Existing
infrastructure-based indoor localization systems lack such capability, on top
of potentially facing several critical technical challenges such as increased
cost of installation, centralization, lack of reliability, poor localization
accuracy, poor adaptation to the dynamics of the surrounding environment,
latency, system-level and computational complexities, repetitive
labor-intensive parameter tuning, and user privacy. To this end, this paper
presents a novel mechanism with the potential to overcome most (if not all) of
the abovementioned challenges. The proposed mechanism is simple, distributed,
adaptive, collaborative, and cost-effective. Based on the proposed algorithm, a
mobile blind device can potentially utilize, as GPS-like reference nodes,
either in-range location-aware compatible mobile devices or preinstalled
low-cost infrastructure-less location-aware beacon nodes. The proposed approach
is model-based and calibration-free that uses the received signal strength to
periodically and collaboratively measure and update the radio frequency
characteristics of the operating environment to estimate the distances to the
reference nodes. Trilateration is then used by the blind device to identify its
own location, similar to that used in the GPS-based system. Simulation and
empirical testing ascertained that the proposed approach can potentially be the
core of future indoor and GPS-obstructed environments
Multi-Sensor Localization and Navigation for Remote Manipulation in Smoky Areas
Abstract When localizing mobile sensors and actuators in
indoor environments laser meters, ultrasonic meters or
even image processing techniques are usually used. On
the other hand, in smoky conditions, due to a fire or
building collapse, once the smoke or dust density grows,
optical methods are not efficient anymore. In these
scenarios other type of sensors must be used, such as
sonar, radar or radiofrequency signals. Indoor
localization in low‐visibility conditions due to smoke is
one of the EU GUARDIANS [1] project goals.
The developed method aims to position a robot in front
of doors, fire extinguishers and other points of interest
with enough accuracy to allow a human operator to
manipulate the robot’s arm in order to actuate over the
element. In coarse‐grain localization, a fingerprinting
technique based on ZigBee and WiFi signals is used,
allowing the robot to navigate inside the building in
order to get near the point of interest that requires
manipulation. In fine‐grained localization a remotely
controlled programmable high intensity LED panel is
used, which acts as a reference to the system in smoky
conditions. Then, smoke detection and visual fine‐
grained localization are used to position the robot with
precisely in the manipulation point (e.g., doors, valves,
etc.)
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