  The Global Positioning System (GPS) has become the most widely used
positioning, navigation, and timing system. However, the vulnerability of GPS
to radio frequency interference has attracted significant attention. After
experiencing several incidents of intentional high-power GPS jamming trials by
North Korea, South Korea decided to deploy the enhanced long-range navigation
(eLoran) system, which is a high-power terrestrial radio-navigation system that
can complement GPS. As the first phase of the South Korean eLoran program, an
eLoran testbed system was recently developed and declared operational on June
1, 2021. Once its operational performance is determined to be satisfactory,
South Korea plans to move to the second phase of the program, which is a
nationwide eLoran system. For the optimal deployment of additional eLoran
transmitters in a nationwide system, it is necessary to properly simulate the
expected positioning accuracy of the said future system. In this study, we
propose enhanced eLoran accuracy simulation methods based on a land cover map
and transmitter jitter estimation. Using actual measurements over the country,
the simulation accuracy of the proposed methods was confirmed to be
approximately 10%-91% better than that of the existing Loran (i.e., Loran-C and
eLoran) positioning accuracy simulators depending on the test locations.
