This study introduces novel algorithms and the underlying mathematics to process photographs of planetary illuminated bodies and use them for navigation purposes. The goal is to accurately estimate the observer-to-body relative position in inertial coordinates. The main motivation is to provide autonomous navigation capabilities to spacecrafts by observing a planet or a moon. This is needed, for example, in human-rated vehicles in order to provide navigation capabilities in a loss-of-communications scenario. The algorithm is derived for the general case of a triaxial ellipsoid that is observed bounded by an elliptical cone. The orientation of the elliptical cone reference frame is obtained by eigenanalysis, and the offset between the elliptical cone axis and the body center direction as well as the equation of the terminator are quantified. The main contribution of this paper is in the image-processing approach adopted to derive centroid and distance to the body. This is done by selecting a set of pixels around the body limb and modeling the smooth limb transition using two-dimensional circular and elliptical sigmoid functions. More accurate estimates of the centroid and distance are then obtained by iterative nonlinear least-squares using these models. A sensitivity analysis is performed, and numerical examples using a real moon photograph taken from Earth are provided to clarify the image-processing steps and to validate the proposed theory.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Image Processing of Illuminated Ellipsoid




    Erscheinungsdatum :

    2016




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch



    Klassifikation :

    BKL:    55.60 Raumfahrttechnik
    Lokalklassifikation TIB:    770/7040



    Image Processing of Illuminated Ellipsoid

    Mortari, Daniele / D’Souza, Christopher N. / Zanetti, Renato | AIAA | 2016


    Image Processing of Illuminated Ellipsoid (AAS 13-853)

    Mortari, D. / de Dilectis, F. / D Souza, C. et al. | British Library Conference Proceedings | 2014


    Toroidal Ellipsoid Float-Zone Heater

    Davidson, R. B. | NTRS | 1984


    Ellipsoid Decomposition of 3D Models

    Bischoff, S. / Kobbelt, L. | British Library Conference Proceedings | 2002


    SKN-Fläche Nordsee 2021 (Ellipsoid)

    Bundesamt für Seeschifffahrt und Hydrographie (BSH) | Mobilithek | 2024

    Freier Zugriff