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• W4225539663 abstract "Use of the long-range (LoRa) communication protocol in a new generation of transceivers is attractive for search and rescue (SaR) procedures because they can operate in harsh environments, covering vast areas while maintaining low power consumption. The possibility of wearing helmets equipped with LoRa radios and installing LoRa transceivers in unmanned aerial vehicles (UAVs) will accelerate the localization of the targets, probably unconsciously. In this article, the achievable communication ranges of such links are theoretically and experimentally evaluated by considering possible positions of the helmet wearer (standing or lying) on a flat field, representing a simple SaR scenario. The simulations and experimental tests demonstrated that, for the standing position, the ground-bounce multipath produces strong fluctuations of the received power versus the transmitter-receiver (Tx-Rx) distances. Such fluctuations can be kept confined within 100 m from the target by lowering the UAV’s altitude. Instead, for a more critical lying position, the received power profile is monotonic and nearly insensitive to the posture. For all the considered cases, the signal emitted by the body-worn transceiver can be exploited to localize the helmet wearer based on its strength, and it is theoretically detectable by the UAV radio up to 5 km on flat terrain." @default.
• W4225539663 created "2022-05-05" @default.
• W4225539663 creator A5040574031 @default.
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• W4225539663 date "2023-02-01" @default.
• W4225539663 modified "2023-10-17" @default.
• W4225539663 title "Numerical and Experimental Characterization of LoRa-Based Helmet-to-Unmanned Aerial Vehicle Links on Flat Lands: A numerical-statistical approach to link modeling" @default.
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• W4225539663 doi "https://doi.org/10.1109/map.2022.3176590" @default.
• W4225539663 hasPublicationYear "2023" @default.
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