Intentional high-power global positioning system jamming is a significant threat for ships in the South Korean waters and has occurred multiple times in recent years. The South Korean government intends to utilize the existing long-range navigation (Loran) infrastructure to provide a backup navigation capability to maritime users. However, the observed accuracy of a conventional Loran positioning fix during a field test in Incheon, South Korea, was 592.88 m, far from the 20-m accuracy that the South Korean government tries to provide. The largest error source for Loran is the additional secondary factor (ASF) delay. A conventional time of flight based ASF correction is not applicable in Northeast Asia because several transmitters are not synchronized to universal time coordinated. Thus, we propose a time difference of arrival based ASF correction method that is applicable to the existing Loran signals in Northeast Asia. The demonstrated accuracy with this correction was 32.12 m when using a single Loran chain for positioning. In order to utilize the full capability of the observed signals from the five transmitters of two Loran chains in the region, we further propose a novel multichain-based Loran positioning algorithm. By applying this algorithm together with the ASF correction method, we achieved a 15.32-m accuracy with 100% position availability. This result shows the potential of the existing Loran transmitters in Northeast Asia to provide a reliable and accurate backup maritime navigation service.
|Number of pages||14|
|Journal||IEEE Transactions on Aerospace and Electronic Systems|
|Publication status||Published - 2018 Apr|
Bibliographical noteFunding Information:
This work was supported by the Ministry of Science and ICT (MSIT), South Korea, under the “ICT Consilience Creative Program” (IITP-2017-2017-0-01015) supervised by the Institute for Information and Communications Technology Promotion (IITP).
Mr. Rhee received the Graduate Fellowship from the ICT Consilience Creative Program supported by the Ministry of Science and ICT, South Korea.
Prof. Seo is a member of the International Advisory Council of the Resilient Navigation and Timing Foundation, Alexandria, VA, USA, and a member of several advisory committees of the Ministry of Oceans and Fisheries and the Ministry of Land, Infrastructure and Transport, South Korea.
© 2017 IEEE.
All Science Journal Classification (ASJC) codes
- Aerospace Engineering
- Electrical and Electronic Engineering