Sentinel-1A is the first satellite of the European Copernicus programme. Equipped with a Synthetic Aperture Radar (SAR) instrument the satellite was launched on April 3, 2014. Operational since October 2014 the satellite delivers valuable data for more than two years. The orbit accuracy requirements are given as 5. cm in 3D. In order to fulfill this stringent requirement the precise orbit determination (POD) is based on the dual-frequency GPS observations delivered by an eight-channel GPS receiver.The Copernicus POD (CPOD) Service is in charge of providing the orbital and auxiliary products required by the PDGS (Payload Data Ground Segment). External orbit validation is regularly performed by comparing the CPOD Service orbits to orbit solutions provided by POD expert members of the Copernicus POD Quality Working Group (QWG). The orbit comparisons revealed systematic orbit offsets mainly in radial direction (approx. 3. cm). Although no independent observation technique (e.g. DORIS, SLR) is available to validate the GPS-derived orbit solutions, comparisons between the different antenna phase center variations and different reduced-dynamic orbit determination approaches used in the various software packages helped to detect the cause of the systematic offset. An error in the given geometry information about the satellite has been found. After correction of the geometry the orbit validation shows a significant reduction of the radial offset to below 5. mm. The 5. cm orbit accuracy requirement in 3D is fulfilled according to the results of the orbit comparisons between the different orbit solutions from the QWG.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Sentinel-1A - First precise orbit determination results




    Erscheinungsdatum :

    2017



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch



    Klassifikation :

    BKL:    55.60 Raumfahrttechnik / 50.93 / 55.60 / 50.93 Weltraumforschung



    Sentinel-1A – First precise orbit determination results

    Peter, H. / Jäggi, A. / Fernández, J. et al. | Elsevier | 2017


    Precise Orbit Determination

    Liu, Lin | Springer Verlag | 2023


    Precise GPS orbit determination results from 1985 field tests

    LICHTEN, S. / BORDER, J. / WU, S.-C. et al. | AIAA | 1986


    Precise orbit determination for GRACE

    Kang, Z. | Online Contents | 2003


    Precise Orbit Determination for GRACE

    Kang, Z. / Nagel, P. / Pastor, R. et al. | British Library Conference Proceedings | 2003