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  • ASTRODYNAMICS  (5)
  • SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
  • 1990-1994  (5)
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  • 1
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    Accuracy assessment of GPS satellite orbits (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: GPS orbit accuracy is examined using several evaluation procedures. The existence is shown of unmodeled effects which correlate with the eclipsing of the sun. The ability to obtain geodetic results that show an accuracy of 1-2 parts in 10 to the 8th or better has not diminished.
    Keywords: ASTRODYNAMICS
    Type: of the COSPAR 28th Plenary Meeting, The Hague, Netherlands, June 25-July 6, 1990. A91-47626 20-12) Advances in Space Research (ISSN 0273-1177); 189-192
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Application of Encke's method to long arc orbit determination solutions (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: ASTRODYNAMICS
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 14; 683-686
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Precision orbit determination for Topex (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The ability of radar altimeters to measure the distance from a satellite to the ocean surface with a precision of the order of 2 cm imposes unique requirements for the orbit determination accuracy. The orbit accuracy requirements will be especially demanding for the joint NASA/CNES Ocean Topography Experiment (Topex/Poseidon). For this mission, a radial orbit accuracy of 13 centimeters will be required for a mission period of three to five years. This is an order of magnitude improvement in the accuracy achieved during any previous satellite mission. This investigation considers the factors which limit the orbit accuracy for the Topex mission. Particular error sources which are considered include the geopotential, the radiation pressure and the atmospheric drag model.
    Keywords: ASTRODYNAMICS
    Type: Advances in Space Research (ISSN 0273-1177); 10; 4-Mar
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    NASA TECHNICAL REPORTS
  • 4
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    Precision orbit determination for the Geosat Exact Repeat Mission (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Precise ephemerides have been determined for the U.S. Navy Geosat Exact Repeat Mission (ERM) using an improved gravity-field model, PTGF-4A (Shum et al. 1989). The Geosat orbits were computed in a terrestrial reference system which is tied to the reference system defined by satellite laser ranging (SLR) to Lageos through a survey between the Tranet Doppler receiver and the SLR system located at Wettzell, FRG. The remaining Doppler tracking station coordinates were estimated simultaneously with the geopotential in the PTGF-4A solution. In this analysis, three continuous 17-day Geosat orbits, which were computed using the 46-station Tranet data and global altimeter crossover data, have a crossover residual rms of 20 cm, indicating that the Geosat radial orbit error is of the order of 20 cm. The orbits computed based on data collected by a 7-station OPNET tracking network and crossover data have the same level of accuracy.
    Keywords: ASTRODYNAMICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 2887-289
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    NASA TECHNICAL REPORTS
  • 5
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    Altimeter crossover methods for precision orbit determination and the mapping of geophysical parameters (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Accurate orbit determination and the recovery of geophysical parameters are presently attempted via methodologies which use differenced height measurements at the points where the ground tracks of the altimetric satellite orbits intersect. Such 'crossover measurements' could significantly improve the earth's gravity field model. Attention is given to a novel technique employing crossover measurements from two satellites carrying altimeter instruments; this method can observe zonal harmonics of the earth's geopotential which are weakly observed through single-satellite crossovers. This dual-satellite crossover technique will be applicable to data from such future oceanographic satellites as ERS-1.
    Keywords: ASTRODYNAMICS
    Type: Journal of the Astronautical Sciences (ISSN 0021-9142); 38; 355-368
    Format: text
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    NASA TECHNICAL REPORTS
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