Jiang, Nan ; Xu, Tianhe ; Xu, Yan ; Xu, Guochang ; Schuh, Harald (2019-04-25)
Inter-system bias (ISB) will affect accuracy and processing time in integrated precise point positioning (PPP), and ISB stochastic models will largely determine the quality of ISB estimation. Thus, the impacts of four different stochastic models of ISB processing will be assessed and studied in detail to further reveal the influence of ISB in positioning. They are ISB-PW considering ISB as a pi...GNSS inter-system bias estimation, modeling, and prediction
Jiang, Nan (2019)
Up to now, the precise point positioning (PPP) has stepped from the single system mode into the multi-GNSS combination. The key point of multi-GNSS integrated PPP is to carefully calibrate the inter-system-bias (ISB) between different systems. If ISB can be modeled, this error will be well corrected. It will significantly increase the usability of satellites and enhance compatibility and intero...Frame tie based on VLBI observations to near-field spacecraft
Liu, Li (2019)
The objective of this work is to find approaches to realize the link of celestial reference frames, the dynamic spacecraft reference frame and the more stable and accurate International Celestial Reference Frame (ICRF), by observing the spacecraft with Very Long Baseline Interferometry (VLBI). In this work, the phase referencing observations to Global Navigation Satellite System (GNSS) satellit...High-frequency earth rotation variations deduced from altimetry-based ocean tides
Madzak, Matthis ; Schindelegger, Michael ; Böhm, Johannes ; Bosch, Wolfgang ; Hagedoorn, Jan (2016)
A model of diurnal and semi-diurnal variations in Earth rotation parameters (ERP) is constructed based on altimetry-measured tidal heights from a multi-mission empirical ocean tide solution. Barotropic currents contributing to relative angular momentum changes are estimated for nine major tides in a global inversion algorithm that solves the two-dimensional momentum equations on a regular 0.5^\...