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  • COMMUNICATIONS  (12)
  • ASTROPHYSICS  (2)
  • Australopithecus africanus  (2)
  • 1
    facet.materialart.
    Unbekannt
    In:  CASI
    Publikationsdatum: 2016-06-07
    Beschreibung: Ionospheric bias corrections associated with radio tracking of spacecraft depend on the following measuring techniques for integrated electron content: (1) Faraday rotation measurements from an earth synchronous satellite; (2) ranging measurements at two frequencies; and (3) group and phase velocity measurements obtained from tracking data. The extraction of the integrated electron content directly from tracking data is achieved by comparison of range-rate measurements based on Doppler shift with differentiated range measurements based on tone delay. This method is most desirable because the measured corrections pertain directly to the spacecraft whose orbit is being determined and can be used in near earth as well as deep space tracking data.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Significant Accomplishments in Technol., GSFC, 1970; p 3-9
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    facet.materialart.
    Unbekannt
    In:  CASI
    Publikationsdatum: 2019-05-29
    Beschreibung: Communication system radio frequency selection for space mission and capsule recovery
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA-TM-X-55525 , X-507-66-169
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    facet.materialart.
    Unbekannt
    In:  CASI
    Publikationsdatum: 2019-05-30
    Beschreibung: Tracking errors at S-band and C-band frequencies resulting from diurnal, seasonal, and annual changes in earths atmosphere
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA-TN-D-3470
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2019-06-27
    Beschreibung: The uncertainty in relay satellite sate is a significant error source which cannot be ignored in the reduction of satellite-to-satellite tracking data. Based on simulations and real data reductions, it is numerically impractical to use simultaneous unconstrained solutions to determine both relay and user satellite epoch states. A Bayesian or least squares estimation technique with an a priori procedure is presented which permits the adjustment of relay satellite epoch state in the reduction of satellite-to-satellite tracking data without the numerical difficulties introduced by an ill-conditioned normal matrix.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA-TM-X-71408 , X-931-77-189
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2019-06-27
    Beschreibung: Feasibility of direct relay of Apollo spacecraft data via communication satellite
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA-TM-X-55627 , X-507-66-310
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 2019-06-27
    Beschreibung: Feasibility of direct relay of Apollo spacecraft data via communications satellite
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA-TN-D-4048
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    facet.materialart.
    Unbekannt
    In:  CASI
    Publikationsdatum: 2019-06-27
    Beschreibung: Influence of atmospheric refraction on minitrack interferometer system and correction procedures for computation accuracy
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA-TN-D-5966 , G-974
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    facet.materialart.
    Unbekannt
    In:  CASI
    Publikationsdatum: 2019-06-27
    Beschreibung: Tracking performance of Apollo land and ship based C band radar equipment
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA-TM-X-63049 , X-551-67-503
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    facet.materialart.
    Unbekannt
    In:  Other Sources
    Publikationsdatum: 2019-07-13
    Beschreibung: The experiment described was conducted to demonstrate a procedure for tracking a near-earth satellite via a geostationary satellite without the aid of multiple ground station tracking. Another objective of the experiment was connected with the utilization of the broad tracking coverage provided by the geostationary satellite to obtain an improved geopotential solution. Questions of overall experiment implementation are discussed along with details regarding ground equipment, the ATS-F transponder, and the Nimbus-F transponder. Aspects of measurement evaluation are also examined, taking into account basic measurements, measurement interpretation, and approaches for orbit computation.
    Schlagwort(e): COMMUNICATIONS
    Materialart: International Convention and Exposition; Mar 26, 1974 - Mar 29, 1974; New York, NY
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Publikationsdatum: 2019-07-13
    Beschreibung: The method utilizes computer programs developed for the forthcoming ATS-F/NIMBUS-F tracking and data relay experiment where the basic tracking measurements are multiple path round-trip propagation times and rates. This method of orbit computation has recently been successfully evaluated by tracking a geostationary satellite (ATS-3) using an existing VHF (150 MHz) network of automatic transponders. A master station sequentially interrogates each transponder via the ATS-3. The master site is located at Schenectady, N. Y. and four automatic transponders were located at Shannon, Reykajavik, Buenos Aires, and Seattle respectively. Data at hourly intervals were collected during a 24 hour period on April 18-19, 1973. After correcting this data for known systematic errors it was provided as input to an orbit determination program where all satellite motions during signal propagation are rigorously accounted for. The resulting estimated ATS-3 orbit yielded observational residuals on the order of 100 meters. By using more than one satellite the present scheme is further capable of accurately locating several stationary or mobile terminals as part of the overall orbital solution.
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA-TM-X-70587 , X-591-74-2 , American Geophysical Union Fall Annual Meeting; Dec 10, 1973 - Dec 13, 1973; San Francisco
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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