Precise orbit determination of LEO satellites is of central importance for many applications of geodesy and Earth science. iGMAS innovation center provides precise science orbit (PSO) products for LEO satellites, including GRACE Follow-on, Swarm, Jason-3, Sentinel-3, etc.

All LEO precise science orbit products are generated by a reduced-dynamic approach in post-processing. Single-receiver ambiguity fixing technique is also applied in our processing to achieve the ultimate accuracy (see here for more details).

Due to the latency of onboard GNSS observations and auxiliary data, the minimum latency of the PSO product is about three weeks.

The trial operation will last for about one month. If everything goes well, the PSO products will be released in September 2020.