Post-Graduate Program in Electrical and Computer Engineering, Federal University of Rio Grande do Norte (UFRN), Natal 59078-970, RN, Brazil.
Department of Electrical Engineering, Federal University of Juiz de Fora, Juiz de Fora 36036-900, MG, Brazil.
Sensors (Basel). 2021 Dec 23;22(1):65. doi: 10.3390/s22010065.
The use of unmanned aerial vehicles (UAV) to provide services such as the Internet, goods delivery, and air taxis has become a reality in recent years. The use of these aircraft requires a secure communication between the control station and the UAV, which demands the characterization of the communication channel. This paper aims to present a measurement setup using an unmanned aircraft to acquire data for the characterization of the radio frequency channel in a propagation environment with particular vegetation (Caatinga) and a lake. This paper presents the following contributions: identification of the communication channel model that best describes the characteristics of communication; characterization of the effects of large-scale fading, such as path loss and log-normal shadowing; characterization of small-scale fading (multipath and Doppler); and estimation of the aircraft speed from the identified Doppler frequency.
近年来，使用无人机 (UAV) 提供互联网、货物运输和空中出租车等服务已经成为现实。这些飞机的使用需要控制站和无人机之间的安全通信，这就需要对通信信道进行特征描述。本文旨在介绍一种使用无人机获取数据的测量设置，用于对具有特殊植被（卡廷加）和湖泊的传播环境中的射频信道进行特征描述。本文提出了以下贡献：确定最能描述通信特性的通信信道模型；对大尺度衰落（如路径损耗和对数正态阴影衰落）的影响进行特征描述；对小尺度衰落（多径和多普勒）进行特征描述；以及从识别出的多普勒频率估计飞机速度。
