  Assuming failure in the global navigation satellite systems due to radio
frequency interference and ionospheric anomaly, an R-Mode system, a terrestrial
integrated navigation system, is being actively studied for domestic deployment
in South Korea. In this study, parameters for an approximate calculation of the
received signal strength were obtained and applied to develop a performance
simulation tool for a medium-frequency R-Mode system. As a case study, the
signal strength from the Yeongju transmitter was simulated using the proposed
parameters.
