GNSS provides accurate positions of objects on the Earth’s surface by taking advantage of its precise ephemeris. The world’s most accurate ephemeris is provided by the International GNSS Service (IGS) and leveraged for individual applications including geodesy and geophysics. Combining precise ephemerides submitted by IGS Analysis Centers, IGS ensures accurate and reliable product generation. However, there had been neither participation of the Analysis Center nor contribution to this combination process from Japan. In July 2023, the joint collaborative initiative with GSI and JAXA led to yield precise ephemeris using the original Japanese multi-GNSS processing software “MADOCA”. Following this, GSI and JAXA became the first Analysis Center in Japan with the approval of IGS in December 2023. Our performance assessment revealed that GSI and JAXA’s products in the last year are almost as accurate as those calculated by other Analysis Centers. As one of the Analysis Centers, GSI and JAXA take charge of continuous product dissemination and serve the foundation for various applications in science and socioeconomic activities.
