Present combat systems are being upgraded to properly meet the new capabilities being developed against tactical ballistic missiles. The local coordinate systems are being upgraded to a global (WGS-84) coordinate system so that the correct exchange of threat information with other defending units can be done correctly and in a timely manner. This coordinate system upgrade is also used to properly track these threats, The computation of an Earth-centered coordinate (X/sub ECC/, Y/sub ECC/, Z/sub ECC/) system for a track referenced by altitude, latitude, and longitude is straightforward in biaxial (WGS-84) ellipsoid Earth. The problem arises using the Earth-centered coordinate system for the inverse operation to recompute the altitude, latitude and longitude of the track. This computation can only be done approximately. This article introduces a unique analytic derivation to calculate exactly the latitude, longitude, and altitude of a track from an Earth centered coordinate system. The problem is transformed into solving for a root of an eighth-order polynomial, which can then be reduced and solved by rewriting as a quartic equation. A robust, iterative numerical algorithm for computer implementation is also presented for platforms having computational and memory constraint. An example is given and comparisons made to show the application of these techniques.


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    Titel :

    An exact conversion from an Earth-centered coordinate system to latitude, longitude and altitude


    Beteiligte:
    Sudano, J.J. (Autor:in)


    Erscheinungsdatum :

    01.01.1997


    Format / Umfang :

    297618 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch