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  • GEOPHYSICS  (2)
  • 1
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    Ionospheric wave and irregularity measurements using passive radio astronomy techniques (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The observation of midlatitude structures using passive radio astronomy techniques is discussed, with particular attention being given to the low-frequency radio telescope at the Clark Lake Radio Observatory. The present telescope operates in the 10-125-MHz frequency range. Observations of the ionosphere at separations of a few kilometers to a few hundreds of kilometers by the lines of sight to sources are possible, allowing the determination of the amplitude, wavelength, direction of propagation, and propagation speed of ionospheric waves. Data are considered on large-scale ionospheric gradients and the two-dimensional shapes and sizes of ionospheric irregularities.
    Keywords: GEOPHYSICS
    Type: Radio Science (ISSN 0048-6604); 23; 273-282
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Ionospheric limitations to time transfer by satellite (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The ionosphere can contribute appreciable group delay and phase change to radio signals traversing it; this can constitute a fundamental limitation to the accuracy of time and frequency measurements using satellites. Because of the dispersive nature of the ionosphere, the amount of delay is strongly frequency-dependent. Ionospheric compensation is necessary for the most precise time transfer and frequency measurements, with a group delay accuracy better than 10 nanoseconds. A priori modeling is not accurate to better than 25%. The dual-frequency compensation method holds promise, but has not been rigorously experimentally tested. Irregularities in the ionosphere must be included in the compensation process.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Sace Flight Center Proc. of the 16th Ann. Precise Time and Time Interval (PTTI) Appl. and Planning Meeting; p 229-245
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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