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Time of flight and direction of arrival of HF radio signals received over a path along the midlatitude trough: Observations

By D. R. Siddle, A. J. Stocker and E. Michael Warrington

Abstract

Measurements of the time-of-flight, direction of arrival, and Doppler spread are presented for HF radio signals radiated on six frequencies between 4.6 and 18.4 MHz received over a subauroral path oriented along the midlatitude trough between Sweden and the UK. During the day, the signals usually arrived from the great circle direction whereas at night, especially during the winter and equinoctial months; the signals on frequencies between 7.0 and 11.1 MHz often arrived from directions well displaced from the great circle direction. In summer the deviations tended to be smaller (<5°) than those observed during the other seasons (several tens of degrees). The deviations were mainly to the north and often lasted all night, with the time of flight initially decreasing and then increasing, showing an approach and then recession of the reflection point. Southerly deviations were much less coherent and less frequent

Publisher: American Geophysical Union (AGU)
Year: 2004
DOI identifier: 10.1029/2004RS003049
OAI identifier: oai:lra.le.ac.uk:2381/7402
Journal:

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Citations

  1. (2003). A comparison of observed and modelled deviations from the great circle direction for a 4490 km HF propagation path along the mid-latitude ionospheric trough, doi
  2. (1977). A model of the F2 peak electron densities in the main trough region of the ionosphere, doi
  3. (1997). A novel method to improve the perform ance of Capon’s minimum variance estimator, doi
  4. (2000). Application of a trough model for telecommunication purposes, doi
  5. (1999). COST 251: Improved quality of service in ionospheric telecommunication systems planning and operation: Final report, Space Res. Cent.,
  6. (1969). High resolution frequency-wavenumber spectrum analysis, doi
  7. (1997). Imaging of electron density troughs by tomographic techniques, doi
  8. (1997). Large HF bearing errors for propagation-paths tangential to the auroral oval, doi
  9. (1998). Measurements of Doppler and multipath spread on oblique high latitude HF paths and their use in characterising data modem performance, doi
  10. (2003). Measurements of the Doppler and multipath spread of HF signals received over a path oriented along the mid-latitude trough, doi
  11. (2003). Oblique ionogram features associated with off-great-circle HF propagation at high and sub-auroral latitudes, doi
  12. (1997). Observations of the Doppler spread on HF signals propagated over high-latitude paths, IEE doi
  13. (2001). Properties of the main trough of the F region derived from Dynamic Explorer 2 data,
  14. (2001). Signal-to-Noise Predictions Using VOACAP, Including VOAARSA,
  15. (1997). Standardized procedure for comparing predicted and observed HF sky-wave signal intensities and the presentation of such comparisons, ITU-R Recomm. P1148–1, paragraph 3.5,
  16. (1997). Structure of the poleward wall of the trough and the inclination of the geomagnetic field above the EISCAT radar, doi
  17. (1997). The effects of receiver location in two-station experimental ionospheric tomography, doi
  18. (1983). The mid-latitude trough in electron concentration of the ionospheric F-layer: A review of observations and modelling, doi
  19. (2004). Time of flight and direction of arrival of HF radio signals received over a path along the mid-latitude trough: Theoretical considerations, doi

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