Filtering by Subject: Navigation, Guidance, Control and Dynamics

Precise estimation of the GPS To Galileo Time Offset: an experimental setup and its associated processing method

Pierre Sakic, Edmond Saint-Denis, Solène Thevenet, et al.

Published: 2024-02-15
Subjects: Aerospace Engineering, Earth Sciences, Geophysics and Seismology, Navigation, Guidance, Control and Dynamics, Other Earth Sciences, Other Engineering

Although the satellite navigation systems are all in their definition based on the international atomic time (TAI), each system has its own realization. There is therefore a difference, variable in time, between different realizations of the same time systems. Thus, the time of the GPS (GPST) and Galileo (Galileo System Time, GST) systems differ in their realization by some nanoseconds. This [...]

An experimental combination of IGS repro3 campaign’s orbit products using a variance component estimation strategy

Pierre Sakic, Gustavo Bento Mansur, Benjamin Männel, et al.

Published: 2021-10-05
Subjects: Astrophysics and Astronomy, Earth Sciences, Navigation, Guidance, Control and Dynamics, Other Earth Sciences, Other Mathematics

Over the past years, the International GNSS Service (IGS) has put efforts into reprocessing campaigns reanalyzing the full data collected by the IGS network since 1994. The goal is to provide a consistent set of orbits, station coordinates, and earth rotation parameters using state-of-the-art models. Different from the previous campaigns - namely: repro1 and repro2 - the repro3 includes not only [...]

Speeding up PPP ambiguity resolution using triple-frequency GPS/BeiDou/Galileo/QZSS data

Jianghui Geng, Jiang Guo, Xiaolin Meng, et al.

Published: 2019-08-29
Subjects: Aerospace Engineering, Civil and Environmental Engineering, Engineering, Navigation, Guidance, Control and Dynamics

Precise point positioning (PPP) has been suffering from slow convergences to ambiguity-fixed solutions. It is expected that this situation can be relieved or even resolved using triple-frequency GNSS data. We therefore attempt an approach where uncombined triple-frequency GPS/BeiDou/Galileo/QZSS (Quasi-zenith satellite system) data are injected into PPP, whereas their raw ambiguities are mapped [...]

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