{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T01:40:07Z","timestamp":1767922807404,"version":"3.49.0"},"reference-count":32,"publisher":"MDPI AG","issue":"23","license":[{"start":{"date-parts":[[2022,12,2]],"date-time":"2022-12-02T00:00:00Z","timestamp":1669939200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"ESA","award":["4000130973\/20\/NL\/CRS\/hh"],"award-info":[{"award-number":["4000130973\/20\/NL\/CRS\/hh"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>In GNSS-based navigation onboard Low Earth Orbit (LEO) satellites, typical accuracy requirements are 10 cm and 0.1 mm\/s for 3D position and velocity, respectively. Previous works have shown that such performance is achieved by including Galileo measurements in the estimation process. Here, we aim to evaluate the impact of employing State Space Representation (SSR) corrections, i.e., GNSS satellite orbit, clock, and biases, to be applied to the broadcast ephemerides. In this framework, the Precise Onboard Orbit Determination (P2OD) software (SW) tool developed at the University of Padua (UNIPD) is used to investigate the needs of onboard navigation. The UNIPD SW employs an Extended Kalman Filter (EKF) using a reduced-dynamics approach. The force model implemented is adapted to onboard processing, and empirical accelerations are included to take into account residual force mismodeling. Actual observation data from the LEO Sentinel-6A satellite are processed along with SSR corrections from the CNES service. Galileo-based solutions are compared to ground-based POD reference orbits. The analysis suggests that the use of SSR corrections provides sub-decimeter and below 0.1 mm\/s accuracies in 3D position and velocity, respectively. Such results indicate a P2OD solution quality close to that achievable by adopting precise orbits and clocks.<\/jats:p>","DOI":"10.3390\/rs14236121","type":"journal-article","created":{"date-parts":[[2022,12,5]],"date-time":"2022-12-05T05:31:32Z","timestamp":1670218292000},"page":"6121","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Sub-Decimeter Onboard Orbit Determination of LEO Satellites Using SSR Corrections: A Galileo-Based Case Study for the Sentinel-6A Satellite"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6848-3836","authenticated-orcid":false,"given":"Francesco","family":"Darugna","sequence":"first","affiliation":[{"name":"Department of Physics and Astronomy, University of Padua, Vicolo dell\u2019 Osservatorio, 2, 35122 Padova, Italy"},{"name":"Geo++ GmbH, Steinriede 8, 30827 Garbsen, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6113-2264","authenticated-orcid":false,"given":"Stefano","family":"Casotto","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy, University of Padua, Vicolo dell\u2019 Osservatorio, 2, 35122 Padova, Italy"},{"name":"Centro di Ateneo di Studi e Attivit\u00e0 Spaziali \u201cGiuseppe Colombo\u201d\u2014CISAS, Via Venezia 15, 35131 Padova, Italy"}]},{"given":"Massimo","family":"Bardella","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy, University of Padua, Vicolo dell\u2019 Osservatorio, 2, 35122 Padova, Italy"}]},{"given":"Mauro","family":"Sciarratta","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy, University of Padua, Vicolo dell\u2019 Osservatorio, 2, 35122 Padova, Italy"}]},{"given":"Paolo","family":"Zoccarato","sequence":"additional","affiliation":[{"name":"European Space Research and Technology Centre (ESTEC), European Space Agency (ESA), Keplerlaan 1, 2201 Noordwijk, The Netherlands"}]}],"member":"1968","published-online":{"date-parts":[[2022,12,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1016\/j.asr.2018.08.017","article-title":"LEO enhanced Global Navigation Satellite System (LeGNSS) for real-time precise positioning services","volume":"63","author":"Li","year":"2019","journal-title":"Adv. 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