Tomography of grass bulk permittivity using RFID propagation-based sensing

Abstract

<p>Propagation-based sensing is an emerging approach to sense remotely the properties of the propagation channel. This study shows how interrogating tags across 19 m of dense grass influences the phase delay. Moving the tag vertically within the grass, then without grass, is used to estimate the slowness caused by the vegetated volume. The overall volume ratio of the grass is estimated at 0.75‰ with the RFID, close to the 0.53% estimated by weighting.</p>