Xiaogong Hu

TL;DR: This study estimates orbital elements and clock errors for a 3GEO+2IGSO constellation using a multi-satellite precise orbit determination (MPOD) strategy, with which clock error elimination algorithm is applied to separate orbital and clock estimates to improve numerical efficiency.

TL;DR: In order to improve the orbit determination accuracy for BDS, a new orbit determination strategy is proposed, in which the satellite clock measurements from TWSTFT are fixed as known values, and only the orbits of the satellites are solved.

TL;DR: Experiments show that COMPASS PPP repeatability for the east, north and up components of a receiver within mainland China is better than 2 cm, 2 cm and 5 cm, respectively, indicating errors remaining in the treatments of COMPASS measurement and dynamic models and reference frame differences existing between two systems.

TL;DR: In this paper, an apparent inter-frequency clock bias (IFCB) for COMPASS GEO satellites is investigated using the real data, and the bias also is modeled by the different models.

TL;DR: In this article, a three-step approach of the multi-satellite precise orbit determination (MPOD) was proposed, where pseudo-range (carrier phase) data are transformed to geometric range (biased geometric range) data without clock offsets; and reasonable empirical acceleration parameters are estimated along with orbital elements to account for the error in solar radiation pressure modeling.