Coverage of Fresnel clarity in LoRa IoT
Abstract
With the development of variable monitoring systems in remote places with a wide coverage perspective, telemetry in real-time without access to energy and that operate for long periods, current LoRa IoT technologies are able to provide connectivity in remote environments such as rivers, lakes, forests. As a result, sensors can carry out telemetry of variables typical to agriculture, livestock, and fish farming, among others things. The sensors connected to wireless networks that transmit data over great distances. Long-range communication systems must present a Fresnel clearance analysis showing the technical conditions of operation in order to achieve good coverage and connectivity. The analysis of the clarity and coverage detection of the first Fresnel zone of IoT devices with LoRa connectivity presented. The analysis and design of the wireless communication of IoT devices, presents a profile of antenna heights, earth curvature, and the estimation of the clearance of obstacles between the antennas, guaranteeing that the signal loss does not exceed the clarity of 60% of the first zone of Fresnel. The metrics obtained are the first radius of the Fresnel Zone: 9.037 meters radius at 0.5 Km; 60% radius without obstacles: 5.4319 meters: total link distance: 1 km; Obstacle distance: 0.5 km Frequency: 915 MHz.
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