In recent years the beneficial effects of combined processing of ground and onboard GNSS observations on the precise orbit determination (POD) of GNSS and Low Earth Orbit (LEO) accuracy became an important topic. This PhD research topic mainly focus on the combined POD of GNSS and LEO satellites.
The kinematic and dynamic POD of different LEO satellites has to be investigated. For instance, by using the level-1B data of Gravity Recovery and Climate Experiment (GRACE) satellites and precise GNSS products from IGS, the dynamic POD of GRACE satellites reaches a 2 centimeter accuracy level. Some methods for improving the accuracy has been deeply studied, for example, an outlier detection method for on-board GNSS observations (Huang et al. 2017). Improving the accuracy and reliability of the processing will be the next step. The combined POD with GNSS satellites, near realtime POD processing and other relevant problems will be studied in the future.
Huang, W.; Deng, Z.; Männel, B.; Schuh, H. (2017, September): A reliable outlier detection method for on-board GNSS pseudo-range observations. Geodetic Week 2017, Berlin, Germany.