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Indoor Wi-Fi Positioning: Techniques and Systems—2nd Edition

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Remote Sensors".

Deadline for manuscript submissions: 20 January 2025 | Viewed by 802

Special Issue Editor


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Guest Editor
Department of Geodesy and Geoinformation, Technische Universitat Wien, 1040 Vienna, Austria
Interests: positioning and navigation with GNSS; location-based services; indoor and pedestrian navigation; applications of multi-sensor systems; smartphone positioning and sensor fusion
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Wi-Fi is one of the most widely used signals for positioning and tracking mobile users. It has been widely adopted for smartphone-based indoor positioning systems due to the availability of infrastructure already deployed for communications. A high number of access points (APs) exist for public and private networks, guaranteeing a high signal ubiquity. The Wi-Fi signals therefore have great potential to be employed for numerous applications for localization and guidance. Localization is based either on direct measurements of the received signal strength (RSS) of the surrounding Wi-Fi access points or on the measurement of the round-trip time (RTT) between the mobile device and the access points. Localization methods, therefore, include lateration and fingerprinting algorithms. Depending on the positioning technique adopted, different levels of positioning accuracy are achievable. This Special Issue is addressed to researchers on all types of localization approaches and algorithms. A special emphasis will be placed on novel approaches for RSS- and RTT-based positioning and their combination and integration. Moreover, sensor integration and fusion, especially in the case of smartphone positioning, represent a major research direction. Original contributions focused on systems and technologies to enable a variety of indoor localization applications are welcome. This Special Issue will provide the opportunity to disseminate, among the scientific community, relevant and new contributions related to the widespread use of Wi-Fi, such as mobile devices, the localization of mobile users in indoor and transitional environments, and location-based services (LBSs), as well as algorithm developments for these applications and the use of new and traditional technologies based on Wi-Fi in indoor spaces.

Prof. Dr. Günther Retscher
Guest Editor

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Keywords

  • wireless fidelity Wi-Fi
  • received signal strength RSS
  • round trip time RTT measurements
  • lateration
  • location fingerprinting
  • combination of techniques
  • sensor integration and fusion
  • positioning algorithms
  • indoor user localization
  • seamless transition between different environments

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Published Papers (1 paper)

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Research

16 pages, 6704 KiB  
Article
Multi-Junction Solar Module and Supercapacitor Self-Powering Miniaturized Environmental Wireless Sensor Nodes
by Mara Bruzzi, Giovanni Pampaloni, Irene Cappelli, Ada Fort, Maurizio Laschi, Valerio Vignoli and Dario Vangi
Sensors 2024, 24(19), 6340; https://doi.org/10.3390/s24196340 - 30 Sep 2024
Viewed by 525
Abstract
A novel prototype based on the combination of a multi-junction, high-efficiency photovoltaic (PV) module and a supercapacitor (SC) able to self-power a wireless sensor node (WSN) for outdoor air quality monitoring has been developed and tested. A PV module with about an 8 [...] Read more.
A novel prototype based on the combination of a multi-junction, high-efficiency photovoltaic (PV) module and a supercapacitor (SC) able to self-power a wireless sensor node (WSN) for outdoor air quality monitoring has been developed and tested. A PV module with about an 8 cm2 active area made of eight GaAs-based triple-junction solar cells with a nominal 29% efficiency was assembled and characterized under terrestrial clear-sky conditions. Energy is stored in a 4000 F/4.2 V supercapacitor with high energy capacity and a virtually infinite lifetime (104 cycles). The node power consumption was tailored to the typical power consumption of miniaturized, low-consumption NDIR CO2 sensors relying on an LED as the IR source. The charge/discharge cycles of the supercapacitor connected to the triple-junction PV module were measured under illumination with a Sun Simulator device at selected radiation intensities and different node duty cycles. Tests of the miniaturized prototype in different illumination conditions outdoors were carried out. A model was developed from the test outcomes to predict the maximum number of sensor samplings and data transmissions tolerated by the node, thus optimizing the WSN operating conditions to ensure its self-powering for years of outdoor deployment. The results show the self-powering ability of the WSN node over different insolation periods throughout the year, demonstrating its operation for a virtually unlimited lifetime without the need for battery substitution. Full article
(This article belongs to the Special Issue Indoor Wi-Fi Positioning: Techniques and Systems—2nd Edition)
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