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  • 1995-1999  (2)
  • 1985-1989  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    A precise multipass method for satellite Doppler positioning (1988)
    Springer
    Celestial mechanics and dynamical astronomy 44 (1988), S. 317-338 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A precise and efficient algorithm is developed for determining the locations of radio beacons (e.g. of the ARGOS or COSPAS/SARSAT type) based on Doppler shift measurements in overflying satellites. The method distinguishes itself through: (1) the use of a very compact analytic orbital theory valid for all eccentricities, (2) autonomous orbit improvement based on Doppler data for one or more local reference beacons accessible at a single LUT, (3) simultaneous orbit improvement and calculation of beacon coordinates for an arbitrary number of satellites, satellite passes, and beacons, and (4) very efficient semi-analytic matrix inversion by partitioning into global, semi-global, and local parameters. The algorithm has been implemented in a FORTRAN program which can be run on a PC. Error statistics are presented from applications of the program to a large number of actual Doppler curves obtained with the ARGOS and COSPAS/SARSAT systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01234271
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Precise ERS-2 orbit determination using SLR, PRARE, and RA observations (1998)
    Springer
    Journal of geodesy 72 (1998), S. 421-429 
    Details
    ISSN: 1432-1394
    Keywords: Key words. ERS-2 ; SLR ; PRARE ; Altimetry ; Orbit determination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract. The second European Remote Sensing satellite ERS-2, launched in 1995, is supported by satellite laser ranging (SLR), the German precise range and range-rate equipment (PRARE) microwave tracking system, and radar altimetry (RA). SLR, PRARE and crossover RA observations (XO/RA) from May, June, and July 1996 have been analyzed using the GEOSAT software developed at Forsvarets forskningsinstitutt (FFI, The Norwegian defence research establishment). Orbits computed with the JGM3 gravity model and the more recent EGM96 gravity model have been compared with orbits from other analysis centers. Based on these comparisons in addition to the post-fit observation residuals, and results from internal orbital overlaps, we conclude that the radial component of the ERS-2 orbit can be determined with a precision of 6 cm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001900050181
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Precise ERS-1 orbit calculation (1995)
    Springer
    Journal of geodesy 69 (1995), S. 192-199 
    Details
    ISSN: 1432-1394
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract This analysis was performed with the GEOSAT software developed at NDRE for high-precision analysis of satellite tracking and VLBI data for geodetic and geodynamic applications. For applications to ERS-1, a realistic surface force model is used together with the Jacchia 77 atmospheric model, semi-daily drag coefficients, a 1-cpr sinusoidal along-track acceleration, and the GSFC JGM-2 gravity model. ERS-1 orbits have been derived for 5.5-day arcs of laser tracking data between July 6 and August 12, 1992. Results from overlapping orbits and comparison with precise D-PAF orbits indicate an orbital accuracy of 10–15 cm in the radial direction, ~ 60 cm in the along-track direction and ~ 15 cm in the cross-track direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806732
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    Paper (German National Licenses)
    Fulltext
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