Novel Multichain-Based Loran Positioning Algorithm for Resilient Navigation

Pyo Woong Son, Joon Hyo Rhee, Jiwon Seo

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)666-679
Number of pages14
JournalIEEE Transactions on Aerospace and Electronic Systems
Issue number2
Publication statusPublished - 2018 Apr

Bibliographical note

Funding 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).

Funding Information:
Mr. Rhee received the Graduate Fellowship from the ICT Consilience Creative Program supported by the Ministry of Science and ICT, South Korea.

Funding Information:
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.

Publisher Copyright:
© 2017 IEEE.

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Electrical and Electronic Engineering


Dive into the research topics of 'Novel Multichain-Based Loran Positioning Algorithm for Resilient Navigation'. Together they form a unique fingerprint.

Cite this