Integrated GNSS Processing for Earth System Monitoring
Final Report Abstract
The project investigated the ability of space-based GNSS observations (i.e., tracked onboard LEOs) to contribute to the terrestrial reference frame directly and indirectly by reducing correlations between parameters and by reducing systematic biases. The main objective of this project was to systematically evaluate the long-term impact of the combination of ground and space-based GNSS observations on station coordinates, satellite orbits, and the terrestrial reference frame. This includes GNSS observations of missions dedicated to the gravity field (e.g., GRACE, GRACE-FO), altimetry (e.g., Jason-2, Jason-3), magnetic field (i.e., Swarm), and Earth observation in general (Sentinel-3 and -6). Driven by international activities (e.g., discussion about the ITRF2020 scale, ESA GENESIS mission), the project focused mainly on the space-based estimation of transmitter phase centers, which are essential for determining an independent GNSS terrestrial scale. A crucial pre-requisite are accurate LEO sensor offsets; the project results show the need for an mm accuracy to determine the terrestrial scale within the GGOS goals. While this is of utmost importance for dedicated co-location missions like the upcoming GENESIS, a challenging inventory was performed for the available LEO missions. Nonetheless, a good agreement of better than 20 mm was achieved for the GPS transmitter offsets in the different LEO missions.
Publications
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GPS z-PCO and GNSS-based scale determined by integrated processing with LEOs and Galileo. Copernicus GmbH.
Huang, Wen; Männel, Benjamin; Brack, Andreas & Schuh, Harald
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Comparison of GNSS-Based Scale Realized by Three Methods - Abstracts, 8th International Colloquium on Scientific and Fundamental Aspects of GNSS (Sofia, Bulgaria 2022)
Huang, W., Männel, B., Brack, A. & Schuh, H.
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Estimation of GPS transmitter antenna phase center offsets by integrating space-based GPS observations. Advances in Space Research, 69(7), 2682-2696.
Huang, Wen; Männel, Benjamin; Brack, Andreas; Ge, Maorong & Schuh, Harald
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GNSS-based scale realization by integrating LEOs - Papers, IAG International Symposium on Reference Frames for Applications in Geosciences (REFAG 2022) (Thessaloniki, Greece 2022)
Huang, W., Männel, B., Brack, A. & Schuh, H.
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Integrated processing of ground- and space-based GNSS, GENESIS Science Workshop
Huang, W., Männel, B., Brack, A., Ge, M., Sakic, P. & Schuh, H.
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LEO-based solution of GPS PCOs and impact on terrestrial scale . Copernicus GmbH.
Huang, Wen; Männel, Benjamin; Brack, Andreas & Schuh, Harald
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Phase center offsets and terrestrial scale from Galileo and LEOs - Presentations, Unified Analysis Workshop (UAW) (Thessaloniki, Greece 2022)
Männel, B. & Huang, W.
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Electron density reconstruction using fleets of LEO satellites. Copernicus GmbH.
Schreiter, Lucas; Brack, Andreas; Männel, Benjamin; Arnold, Daniel & Jäggi, Adrian
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GENESIS: co-location of geodetic techniques in space. Earth, Planets and Space, 75(1).
Delva, Pacôme; Altamimi, Zuheir; Blazquez, Alejandro; Blossfeld, Mathis; Böhm, Johannes; Bonnefond, Pascal; Boy, Jean-Paul; Bruinsma, Sean; Bury, Grzegorz; Chatzinikos, Miltiadis; Couhert, Alexandre; Courde, Clément; Dach, Rolf; Dehant, Véronique; Dell’Agnello, Simone; Elgered, Gunnar; Enderle, Werner; Exertier, Pierre; Glaser, Susanne ... & Zajdel, Radoslaw
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Thermospheric mass density variations based on GRACE-FO during the ascending phase of solar cycle 25. Copernicus GmbH.
Wang, Bowen; Meng, Xiangguang; Sun, Yueqiang; Männel, Benjamin & Wickert, Jens
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Impact of solar activity on thermospheric mass density response: Observations from GRACE-FO. Advances in Space Research, 73(9), 4546-4560.
Wang, Bowen; Meng, Xiangguang; Sun, Yueqiang; Männel, Benjamin; Wickert, Jens; Bai, Weihua & Tang, Longjiang
