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Author: Stanford University. Stanford Electronics Laboratories Publisher: ISBN: Category : Languages : en Pages : 68
Book Description
Two methods of oblique-incidence ionospheric sounding--sweep-frequency cw and pulse--were compared over the 8000-km path from Hawaii to Mass. Three cw frequency sweep rates, 25, 100, and 1000 kHz/sec, were explored at various power levels between 1 and 10,000 w. The pulse sounder employed 100-used, 30-kw pulses at a repetition rate of 50 pulses/sec. The tests were conducted in December 1965. (Author).
Author: Stanford University. Stanford Electronics Laboratories Publisher: ISBN: Category : Languages : en Pages : 68
Book Description
Two methods of oblique-incidence ionospheric sounding--sweep-frequency cw and pulse--were compared over the 8000-km path from Hawaii to Mass. Three cw frequency sweep rates, 25, 100, and 1000 kHz/sec, were explored at various power levels between 1 and 10,000 w. The pulse sounder employed 100-used, 30-kw pulses at a repetition rate of 50 pulses/sec. The tests were conducted in December 1965. (Author).
Author: James Robert Barnum Publisher: ISBN: Category : Electronic data processing Languages : en Pages : 124
Book Description
Twenty-four hour high-resolution FMCW soundings taken over an East-West 1900-km forward-propagation path show unexpectedly complex mode structure near sunset. Because of the presence of 1- and 2-hop sporadic-E modes, it was suggested that multiple reflections from sporadic-E and F-layers--such as 'M' and 'N' modes--accounted for much of the unexplained structure. This work represents an attempt to see how well these 'mixed' modes can be understood by employing computer ray-tracing procedures developed by Dr. T.A. Croft. A simple beta-Chapman layer, with its parameters adjusted to give synthetic ionograms that matched the experimental 1- and 2-hop F-layer modes, proved to be an adequate model for the F-layer profile over the path. Reference to the calibrated experimental ionograms yielded values for the sporadic-E reflection heights for each time of day. Assuming no horizontal tilts in layer density and ignoring the earth's magnetic field, synthetic ionograms involving multiple F-layer and sporadic-E reflections were then computed. The model-experiment comparisons show that surprisingly accurate estimations of both 1- and 2-hop and mixed modes are possible, using only relatively simple computational procedures. Although similar work has been done in this area, the present study is novel in its use of calibrated oblique ionograms for model derivation. The work should lead to a better understanding of both HF forward and backscatter propagation studies which are plagued with multiple, interlayer propagation modes. (Author).
Author: Kenneth Davies Publisher: IET ISBN: 9780863411861 Category : Science Languages : en Pages : 612
Book Description
This introductory text replaces two earlier publications (Davies 1965, 1969). Among the topics: characteristics of waves and plasma, the solar-terrestrial system, the Appleton formula, radio soundings of the ionosphere, morphology of the ionosphere, oblique propagation, importance of amplitude and phase, earth-space propagation. Annotation copyrighted by Book News, Inc., Portland, OR
Author: Stanford University. Stanford Electronics Laboratories
Author: Stanford University. Stanford Electronics Laboratories
Author: 
Author: Stanford University. Stanford Electronics Laboratories
Author: James Robert Barnum
Author: 
Author: 
Author: 
Author: 
Author: Kenneth Davies
Author: Kenneth Davies