Wideband measurements of coherence over an HF skywave link and implication for spread-spectrum communication
Article first published online: 7 DEC 2012
Copyright 1986 by the American Geophysical Union.
Volume 21, Issue 3, pages 463–472, May-June 1986
How to Cite
1986), Wideband measurements of coherence over an HF skywave link and implication for spread-spectrum communication, Radio Sci., 21(3), 463–472, doi:10.1029/RS021i003p00463., and (
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 13 NOV 1985
- Manuscript Received: 15 MAR 1985
A wideband frequency-modulated, continuous-wave (FMCW) oblique incidence sounder was used in an experiment to measure the coherent bandwidth of a one-hop F2 layer propagated ionospheric path. The experimental data were collected over a 234-km link in the United Kingdom by using frequency sweeps of up to 5 MHz repeated at 10-s intervals. The path had the characteristics of quasi-longitudinal propagation. The results indicated that the limiting factors to the coherent bandwidth are mainly polarization interference and frequency dispersion. Data on the coherent bandwidth and fade depth as a function of frequency and the time variation of the amplitude frequency response are presented.