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http://dx.doi.org/10.11003/JPNT.2021.10.4.279

Correction of Time and Coordinate Systems for Interoperability of Multi-GNSS  

Kim, Lawoo (Department of Electronics and Information Engineering, Korea Aerospace University)
Lee, Yu Dam (Department of Electronics and Information Engineering, Korea Aerospace University)
Lee, Hyung Keun (Department of Electronics and Information Engineering, Korea Aerospace University)
Publication Information
Journal of Positioning, Navigation, and Timing / v.10, no.4, 2021 , pp. 279-289 More about this Journal
Abstract
GNSS receivers capable of tracking multiple Global Navigation Systems (GNSSs) simultaneously are widely used. In order to estimate accurate user position and velocity, it is necessary to consider the key elements that contribute to the interoperability of the different GNSSs. Typical examples are the time system and the coordinate system. Each GNSS is operated based on its own reference time system depending on when the system was developed and whether the leap seconds are applied. In addition, each GNSS is designed based on its own coordinate system based on earth model constant values. This paper addresses the interoperability issues from the viewpoint of Single Point Positioning (SPP) users utilizing multiple GNSS signals from GPS, GLONASS, BeiDou, and Galileo. Since the broadcast ephemerides of each GNSS are based on their own time and coordinate systems, the time and the coordinate systems should be unified for any user algorithm. For this purpose, this paper proposes a method of converting each GNSS coordinate system into the reference coordinate system through Helmert transformation. The error of the broadcast ephemerides was calculated with the precise ephemerides provided by the International GNSS Service (IGS). The effectiveness of the proposed multi-GNSS correction and transformation method is verified using the Multi-GNSS Experiment (MGEX) station data.
Keywords
GNSS; multi-GNSS interoperability; Helmert transformation; precise ephemeris;
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