DEVELOPMENT OF THE KOREAN eLORAN TESTBED AND ANALYSIS OF ITS EXPECTED POSITIONING ACCURACY

Abstract

Due to the vulnerability of global navigation satellite systems to radio frequency interference, South Korea has decided to deploy the eLoran system. A research and development project to develop an eLoran testbed by 2020 is currently in progress. For the eLoran testbed, a new eLoran transmitter is planned to be installed in Gyodong and two differential correction stations are expected to be installed in Incheon and Pyeongtaek. In this paper, we briefly introduce the currentstatus of the Korean eLoran testbed project. Then, the expected accuracy performance is presented by simulations and experiments. The software simulations compare two cases: a Korean transmittersonly case and a Far East Radio Navigation Service (FERNS) chain case. Because the new eLoran transmitter is not yet deployed, its positioning accuracy cannot be directly measured. Thus, we used the multichain Loran-C positioning algorithm to obtain the expected performance of the eLoran “all-in-view” positioning. The measured performance with five FERNS transmitters and the multichain positioning algorithm for a static user in Incheon was 14.0 m (95%), which satisfies the accuracy requirement of the Korean eLoran testbed project.