  Powered by the advances in microelectronics technologies, unmanned aerial
vehicles (UAVs) provide a vast variety of services ranging from surveillance to
delivery in both military and civilian domains. It is clear that a successful
operation in those services relies heavily on wireless communication
technologies. Even though wireless communication techniques could be considered
to reach a certain level of maturity, wireless communication links including
UAVs should be regarded in a different way due to the peculiar characteristics
of UAVs such as agility in 3D spatial domain and versatility in modes of
operation. Such mobility characteristics in a vast variety of environmental
diversity render links including UAVs different from those in traditional,
terrestrial mobility scenarios. Furthermore, UAVs are critical instruments for
network operators in order to provide basic voice and short messaging services
for narrow band communication in and around disaster areas. It is obvious that
such widespread use of UAVs under different scenarios and environments requires
a better understanding the behavior of the communication links that include
UAVs. Therefore, in this study, details of a measurement campaign designed to
collect data for large-scale propagation characterization of air-to-ground
links operated by UAVs at 446MHz under narrowband assumption are given. Data
collection, post-processing, and measurement results are provided.
