Enhancing the reliability of GNSS carrier phase measurements for precise positioning applications
Licentiatavhandling, 2024
(PNT) is used worldwide for numerous applications. With the advent of
sophisticated techniques such as real time kinematic (RTK), precise point
positioning (PPP) and the combination RTK-PPP, GNSS positioning using
carrier phase data can now achieve centimetre to millimeter levels of accuracy in
real time both in static or kinematic mode on land and decimeter to centimeter
levels of positioning accuracy on the sea. In a post processing mode this
accuracy can go down to sub-millimeter. However, the different error sources
of GNSS continue to pose a hindrance to this. Even in a differential mode of
operation, while error sources such as clocks and troposphere may cancel out
for short baselines, rapid variations in ionosphere can cause loss of lock of the
GNSS receiver, leading to cycle slips resulting in degraded position estimation.
Also, local unmodelled error sources such as diffraction and multipath cannot
be handled automatically by standard post processing software since they are
dependent on the receiver environment. These error sources lead to large range
errors which in turn impacts the position estimation accuracy. This work is a
compilation of different studies on GNSS error sources and aims at enhancing
the reliability of GNSS carrier phase measurements from a precise positioning
perspective.
PPP
network RTK (NRTK)
Satellite selection
Ionosphere
Diffraction
Multipath
GNSS
Författare
Uttama Dutta
Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium
Multi-Constellation/Multi-Frequency GNSS Signal Degradation Due to Foliage and Reflective Environments †
Engineering Proceedings,; Vol. 54(2023)
Artikel i vetenskaplig tidskrift
Ionospheric Effects on GNSS RTK
35th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2022,; Vol. 3(2022)p. 1557-1566
Paper i proceeding
Satellite Selection in the Context of Network RTK for Limited Bandwidth Applications
Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021),; (2021)p. 2474-2492
Paper i proceeding
Distribution of the Adapted- NRTK Correction Data via VDES for the Shipping Navigation Safety.
Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021),; (2021)p. 521-534
Övrigt konferensbidrag
Uttama Dutta, Jan Johansson, Rüdiger Haas, Investigating the impact of diffraction on GNSS carrier phase measurements.
Styrkeområden
Informations- och kommunikationsteknik
Transport
Energi
Infrastruktur
Onsala rymdobservatorium
Ämneskategorier
Geovetenskap och miljövetenskap
Elektroteknik och elektronik
Signalbehandling
Annan elektroteknik och elektronik
Utgivare
Chalmers
Sal EA i EDIT-huset
Opponent: Per Knudsen, professor, Technical University of Denmark- DTU, pk@space.dtu.dk (https://orbit.dtu.dk/en/persons/per-knudsen)