Information about the coordinate system used in the QZSS Positioning Navigation and Timing (PNT) service
The QZSS broadcast ephemeris and the public archive data on this website are based on the PNT coordinate system defined as below. This coordinate system is described as “JGS” (Japan satellite navigation Geodetic System) in the orbit products provided on this website.
- Origin: Mass center of the earth
- Z-axis: the IERS Reference north pole
- X-axis: Intersection of the IERS Reference Meridian (IRM) and the equatorial plane
- Y-axis: Completes a right-handed, Earth-centered, Earth-Fixed (ECEF) orthogonal coordinate system
The positions of monitor stations are managed by being applied the PNT reference coordinate system stipulated by IERS. The offset of the PNT reference coordinate system relative to ITRF should be within 2 cm (95%).
The history of the applied version of ITRF is as follows.
|ITRF version||Start date||End date|
|ITRF2008||November 1, 2018||February 15, 2021|
|ITRF2014||February 15, 2021||November 9, 2023|
|ITRF2020||November 9, 2023||-|