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  • 1
    Electronic Resource
    Electronic Resource
    Combinations of Satellite Crossovers to Study Orbit and Residual Errors in Altimetry (1999)
    Springer
    Celestial mechanics and dynamical astronomy 74 (1999), S. 231-242 
    Details
    ISSN: 1572-9478
    Keywords: satellite altimetry ; satellite dynamics ; radial orbit component/accuracy ; crossovers ; combinations of single‐ and dual‐satellite crossovers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We define combinations of dual‐ and single‐satellite crossover differences to isolate both stationary orbit‐geopotential and non‐geopotential errors in altimetry data. Specifically two types of combinations are found useful. While no combination of differences can resolve the full radial error of single or paired satellites, an approximation of the mean or geographically correlated error of the generally dominant lower orbit of a pair can be found from one kind (substitutions). (The variable part of the error is always available from the single‐satellite crossover differences.) A second useful combination type is found to yield no geopotential orbit error (zeros): uniquely, these can reveal errors in altimetry from imperfect media corrections as well as oceanographic changes in sealevel. The later circumstance is particularly important when the missions for a pair of satellites are disparate in time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008397202151
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  • 2
    Electronic Resource
    Electronic Resource
    Accuracy assessments of recent earth gravity models using crossover altimetry (1996)
    Springer
    Studia geophysica et geodaetica 40 (1996), S. 77-110 
    Details
    ISSN: 1573-1626
    Keywords: satellite dynamics ; satellite (crossover) altimetry ; Earth gravity field models ; tests of accuracy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The calibrated variance-covariance matrices of the harmonic geopotential coefficients of the recent combined model JGM 2 has been tested and verified by independent crossover altimetry from TOPEX/Poseidon and ERS 1 using the Latitude Lumped Coefficients in the southern oceans area. Although orbits are not yet available for these missions with other recent models for which error matrices have been released, by comparison with JGM 2 results and field differences we also confirm that the error matrices for the satellite model GRIM 4S4p and the combined data model JGM 3 are also generally valid. Projections of these matrices for a variety of inclinations show that many unused orbits of even moderate altitude (≈ 800 km) will still yield trajectory crossover errors at a level of many tens of centimeters even with the latest orbitgeopotential models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02295906
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    Paper (German National Licenses)
    Fulltext
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