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  • GEOPHYSICS  (6)
  • ASTRODYNAMICS  (5)
  • COMMUNICATIONS  (5)
  • AERODYNAMICS  (1)
  • 1
    Publication Date: 2011-08-16
    Description: VLF observations of auroral beams for auroral V-emissions source and characteristics, explaining spectral shape
    Keywords: GEOPHYSICS
    Type: ; ADEMIE DES SCIENCES
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  • 2
    Publication Date: 2016-06-07
    Description: Taking advantage of the improvements to the Earth's gravitation field and tracking station coordinates, an orbital computational consistency of the order of 5 meters was achieved for total position differences between orbital solutions for the Seasat and GEOS-3. The main source of error in these solutions was in the mathematical models that are required to generate these results, i.e., gravitation, atmospheric drag, etc. Different Earth gravitation fields and tracking coordinates were analyzed and evaluated in obtaining these computational results. Comparisons and evaluations of the Seasat results were obtained in terms of different solution types such as the Doppler only, Laser only, Doppler and Laser, etc. Other investigation using the Seasat data were made in order to determine their effect on the computational results at this particular level of consistency.
    Keywords: ASTRODYNAMICS
    Type: Sixth Ann. Flight Mech.(Estimation Theory Symp.; 36 p
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  • 3
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    Publication Date: 2019-05-30
    Description: Whistler in Alouette I satellite VLF RECORDINGS, variation of time delay with frequency given by Eckersley law time delay and additive correction term
    Keywords: GEOPHYSICS
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  • 4
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    Publication Date: 2019-05-24
    Description: Subprotonospheric whistler reflections at 1000 km attributed to energy refraction by hydrogen ions
    Keywords: COMMUNICATIONS
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  • 5
    Publication Date: 2019-06-28
    Description: A recent mathematical technique for solving systems of equations is applied in a very general way to the orbit determination problem. The study of this technique, the homotopy continuation method, was motivated by the possible need to perform early orbit determination with the Tracking and Data Relay Satellite System (TDRSS), using range and Doppler tracking alone. Basically, a set of six tracking observations is continuously transformed from a set with known solution to the given set of observations with unknown solutions, and the corresponding orbit state vector is followed from the a priori estimate to the solutions. A numerical algorithm for following the state vector is developed and described in detail. Numerical examples using both real and simulated TDRSS tracking are given. A prototype early orbit determination algorithm for possible use in TDRSS orbit operations was extensively tested, and the results are described. Preliminary studies of two extensions of the method are discussed: generalization to a least-squares formulation and generalization to an exhaustive global method.
    Keywords: ASTRODYNAMICS
    Type: NASA-TM-86230 , NAS 1.15:86230
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  • 6
    Publication Date: 2019-05-24
    Description: Proton whistler /VLF phenomenon observed in satellite data/ discussing propagation in multicomponent plasma and ion cyclotron mode
    Keywords: COMMUNICATIONS
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  • 7
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    Publication Date: 2019-05-24
    Description: Unusual noise band observed in VLF recordings of Alouette, investigating resonance in plasma surrounding satellite
    Keywords: COMMUNICATIONS
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  • 8
    Publication Date: 2019-05-30
    Description: Lower hybrid resonance in VLF range in satellites, noting noise emission due to trapping of electromagnetic wave propagation in transverse magnetic field
    Keywords: GEOPHYSICS
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  • 9
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    Publication Date: 2019-05-24
    Description: Radio propagation modes in multicomponent plasma such as ionosphere, examing cutoff and crossover frequency resonances
    Keywords: COMMUNICATIONS
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  • 10
    Publication Date: 2019-06-28
    Description: Definitive orbit determination accuracy and orbit prediction accuracy for the Dynamic Explorer-2 (DE-2) are studied using the trajectory determination system for the period within six weeks of spacecraft reentry. Baseline accuracies using standard orbit determination models and methods are established. A promising general technique for improving the orbit determination accuracy of high drag orbits, estimation of random drag variations at perigee passages, is investigated. This technique improved the fit to the tracking data by a factor of five and improved the solution overlap consistency by a factor of two during a period in which the spacecraft perigee altitude was below 200 kilometers. The results of the DE-2 orbit predictions showed that improvement in short term prediction accuracy reduces to the problem of predicting future drag scale factors: the smoothness of the solar 10.7 centimeter flux density suggests that this may be feasible.
    Keywords: ASTRODYNAMICS
    Type: NASA-TM-85098 , NAS 1.15:85098
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