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Book Chapter

Assessing the Potential of VLBI Transmitters on Next Generation GNSS Satellites for Geodetic Products

Authors
/persons/resource/raut

Raut,  Shrishail
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/sglaser

Glaser,  S.
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/nicat

Mammadaliyev,  Nicat
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/schrei_p

Schreiner,  Patrick Alexander
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/hneum

Neumayer,  Karl
1.2 Global Geomonitoring and Gravity Field, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/schuh

Schuh,  H.
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Raut, S., Glaser, S., Mammadaliyev, N., Schreiner, P. A., Neumayer, K., Schuh, H. (2023 online): Assessing the Potential of VLBI Transmitters on Next Generation GNSS Satellites for Geodetic Products. - In: International Association of Geodesy Symposia, Berlin, Heidelberg : Springer.
https://doi.org/10.1007/1345_2023_217


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5022863
Abstract
The next-generation Global Navigation Satellite Systems (NextGNSS) satellites are planned to be equipped with inter-satellite links and ultra-stable clocks as well as a dedicated Very Long Baseline Interferometry (VLBI) transmitter. This will enable the VLBI network to observe the satellites along with extra-galactic radio sources. The study aims to evaluate the potential benefits by placing VLBI transmitters on NextGNSS satellites. This will empower the NextGNSS to determine UT1-UTC, which is otherwise impossible directly. Furthermore, VLBI observations of satellites would allow for independent validation of satellite orbit determination. In this study, we investigate geodetic parameters such as station positions and Earth Rotation Parameters (ERPs) and the impact of different network geometry on these parameters. Based on the initial findings, it appears that using satellites and quasars in VLBI can define a datum with No-Net Rotation (NNR) without the need for No-Net Translation (NNT) conditions. When both NNR and NNT are imposed, the Helmert transformation parameters are smaller compared to when only NNR is imposed. This can be improved by optimizing the network geometry. Furthermore, the study’s findings indicate that VLBI observations can determine the satellite’s orbit with cm-level accuracy. The performance of the ERPs is better in a uniformly distributed network especially when only NNR condition is imposed.