Urban and Suburban Bay Area Radio Environment for the UAV communications

UAV wireless communication using unlicensed bands, avoiding interference from other wireless systems is an important issue. In the unlicensed bands, many kinds of radio systems are sharing the band. This paper describes the UAV airspace's radio environment's evaluation results in the 920 MHz and 2400 MHz in the urban and suburban bay area. The measuring equipment was installed in a building with a height of 100 m or more for about one week to evaluate the radio environment. The measurement results show little difference between the urban and the suburban bay areas at the 920 MHz band. At 2400 MHz, the received power of the urban area is 16 dB higher at 0.9 points of CDF (cumulative distribution function) than the bay area. It is assumed that this reason is due to building density and height in the surrounding environment.