GLAS is an EOS space-based laser altimeter being developed to profile the height of the Earth’s ice sheets with ∼15 cm single shot accuracy from space under NASA’s Mission to Planet Earth (MTPE). The primary science goal of GLAS is to determine if the ice sheets are increasing or diminishing for climate change modeling. This is achieved by measuring the ice sheet heights over Greenland and Antarctica to 1.5 cm/yr over 100 km×100 km areas by crossover analysis (Zwally 1994). This measurement performance requires the instrument to determine the pointing of the laser beam to ∼5 urad (1 arcsecond), 1-sigma, with respect to the inertial reference frame. The GLAS design incorporates a stellar reference system (SRS) to relate the laser beam pointing angle to the star field with this accuracy. This is the first time a spaceborne laser altimeter is measuring pointing to such high accuracy. The design for the stellar reference system combines an attitude determination system (ADS) with a laser reference system (LRS) to meet this requirement. The SRS approach and expected performance are described in this paper.


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    Titel :

    Geoscience laser altimeter system—stellar reference system


    Beteiligte:
    Millar, Pamela S. (Autor:in) / Sirota, J. Marcos (Autor:in) / El-Genk, Mohamed S. (Herausgeber:in) / Bragg, Mary J. (Herausgeber:in)

    Kongress:

    Space technology and applications international forum - 1998 ; 1998 ; Albuquerque,New Mexico (USA)


    Erschienen in:

    Erscheinungsdatum :

    15.01.1998


    Format / Umfang :

    6 pages





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Geoscience Laser Altimeter System-Stellar Reference System

    Millar, P. S. / Sirota, J. M. / University of New Mexico; School of Engineering; Institute for Space and Nuclear Power Studies | British Library Conference Proceedings | 1998


    Laser Pointing Determination Using Stellar Reference System in Geoscience Laser Altimeter System (AAS 00-123)

    Bae, S. / Schutz, B. E. / AAS et al. | British Library Conference Proceedings | 2000


    The Geoscience Laser Altimeter System (GLAS)

    Abshire, J. B. / Smith, J. C. / Schutz, B. E. et al. | British Library Conference Proceedings | 1998


    The Geoscience Laser Altimeter System (GLAS)

    Abshire, James B. / Smith, James C. / Schutz, Bob E. | American Institute of Physics | 1998


    The Geoscience Laser Altimeter System (GLAS)

    Abshire, J. B. / Smith, J. C. / Schutz, B. E. | British Library Conference Proceedings | 1998