New Results of Multi-GNSS Orbits Validation Based on SLR Observations

Nowadays there are more than 30 GNSS satellites equipped with laser retro-reflectors. Orbits of these satellites can be independently validated with a high precision using range observations by satellite laser ranging (SLR). China has completed the Asia-Pacific area COMPASS Satellite Network, and is committed to the establishment of the international GNSS Monitoring and Assessment System (IGMAS). Orbit validation is one of the key factors in the development of IGMAS, so this paper validated almost all GNSS satellites carrying reflectors to see whether the IGMAS orbits is qualified, including all 24 of GLONASS, 4 of COMPASS, 4 of GALILEO based on the rapid orbits from BACC IGMAS Analysis center. According to IERS2010 convention, correction models such as station coordinates, laser propagation delay models were introduced to establish the measurement model. The validation of the BACC orbits shows a mean deviation around 5–10 cm for the GLONASS satellites, 10–15 cm for the COMPASS MEO/IGSO satellites, 2.65 m for the COMPASS GEO satellites, and 20–25 cm for the GALILEO satellites.