Performance Analysis of ISL POD for Multilayered PNT Systems

Min-Geun Cho, Hyun-Jung Lee, Jong-Hoon Won

Peer Reviewed

Abstract:	Inter-Satellite Link (ISL) is expected to enhance the Precise Orbit Determination (POD) performance of LEO satellites by facilitating inter-satellite data exchange, Inter-Satellite Ranging (ISR), and time synchronization. In particular, the implementation of Networked ISL (NET-ISL), which extends ISLs into a network architecture, can optimize the POD performance of the entire satellite constellation. This study presents preliminary research results for effective ISL design in multi-layered Positioning, Navigation, and Timing (PNT) systems through simulator-based performance analysis under ideal environmental conditions. To rigorously analyze ISL-based PNT systems, ISLs are categorized based on their functions and directionality, and the mathematical background corresponding to each classified link type is described. Finally, performance is evaluated through a comparative analysis between multi-layered PNT systems and single-layer LEO PNT systems.
Published in:	Proceedings of the ION 2026 Pacific PNT Meeting April 13 - 16, 2026 Hilton Waikiki Beach Honolulu, Hawaii
Pages:	185 - 193
Cite this article:	Cho, Min-Geun, Lee, Hyun-Jung, Won, Jong-Hoon, "Performance Analysis of ISL POD for Multilayered PNT Systems," Proceedings of the ION 2026 Pacific PNT Meeting, Honolulu, Hawaii, April 2026, pp. 185-193. https://doi.org/10.33012/2026.20621
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