Identification of suitable carrier frequency for mobile terrestrial communication systems with low antenna heights

Terrestrial communication systems require reliable wireless links for mobile to base connectivity beyond the line of sight where both ends of the link have antennas in close proximity to the ground. Frequency selection will partially determine the performance of a mobile terrestrial communications system in an intense multipath environment. This paper is part of an experimental effort to examine many aspects of RF propagation and radio hardware issues and focuses on the effects of rolling terrain, trees, and buildings on radio performance over a wide range of unmodulated carrier frequencies. Experimental data were collected using the unmanned ground vehicle technology test bed (UGV TTB) and other transmitter/receiver test fixtures. Experimental data were analyzed to determine the sensitivities of propagation mechanisms to carrier frequency. The experimental/analytical results along with bandwidth requirements and legal constraints indicate suitable ranges of carrier frequencies for terrestrial communication systems