  In this work, the results of Ultra-Wideband air-to-ground measurements
carried out in a real-world factory environment are presented and discussed.
With intelligent in-dustrial deployments in mind, we envision a scenario where
the Unmanned Aerial Vehicle can be used as a supplementary tool for factory
operation, optimization and control. Measurements address narrow band and wide
band characterization of the wireless radio channel, and can be used for link
budget calculation, interference studies and time dispersion assessment in real
factories, without the usual limitation for both radio terminals to be close to
ground. The measurements are performed at different locations and different
heights over the 3.1-5.3 GHz band. Some fundamental propagation parameters
values are determined vs. distance, height and propagation conditions. The
measurements are complemented with, and compared to, conventional
ground-to-ground measurements with the same setup. The conducted measurement
campaign gives an insight for realizing wireless applications in smart
connected factories, including UAV-assisted applications.
