Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Bengt Lundborg"'
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 63:1489-1497
A physically based method has been developed to simulate the wideband HF ionospheric propagation channel relevant to the case of wideband spread spectrum HF communications and also other HF applications such as digital broadcasting and over-the-horiz
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7dc630fecdd4979292844c1882521022
https://doi.org/10.1016/s1364-6826(01)00037-2
https://doi.org/10.1016/s1364-6826(01)00037-2
Publikováno v:
Radio Science. 33:97-107
Measurements of Doppler spread, multipath spread, and signal-to-noise ratio have been made on four high-latitude high-frequency (HF) communications paths. The measurement system and analysis techniques are outlined, and an analysis of the data pertin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b41bb23b30321967ef1fc24fd12f2bd
https://doi.org/10.1029/97rs02206
https://doi.org/10.1029/97rs02206
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 59:1843-1854
This article presents a numerical investigation of the two-frequency, two-time coherence function for HF wave propagation in the fluctuating ionosphere. Earlier published results of numerical calculations, with an empirical plane-stratified backgroun
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e2b6488416193d1093881ef7854806af
https://doi.org/10.1016/s1364-6826(97)00012-6
https://doi.org/10.1016/s1364-6826(97)00012-6
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 59:1831-1841
This article presents a detailed numerical investigation of the two-frequency coherence function for HF wave propagation in the fluctuating ionosphere. Earlier published expressions for the coherence function are transformed to a form suitable for nu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d9b775202b67f94dca94100f3ce1045d
https://doi.org/10.1016/s1364-6826(97)00011-4
https://doi.org/10.1016/s1364-6826(97)00011-4
Autor:
Bengt Lundborg, Anders Vastberg
Publikováno v:
Radio Science. 32:2083-2090
This paper discusses signal intensity calculations for ionospheric HF radio waves using the geometrical optics approximation. To calculate the total signal intensity for an ionospheric channel, all the multipath and multimode amplitudes must be super
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cd3ae789da2f8fb44bda787c6d0a1062
https://doi.org/10.1029/97rs00320
https://doi.org/10.1029/97rs00320
Autor:
Bengt Lundborg, Anders Vastberg
Publikováno v:
Radio Science. 31:1579-1588
The paper discusses theoretical and numerical aspects of signal intensity calculations in the geometrical optics approximation for ionospheric HF wave propagation. We present an efficient method for calculating a flux tube of rays for a very general
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::77ca18cd3fd7cfd6404fec1fe0103128
https://doi.org/10.1029/96rs02630
https://doi.org/10.1029/96rs02630
Autor:
Bengt Lundborg, Nikolay N. Zernov
Publikováno v:
Radio Science. 31:67-80
This paper gives a review of the advantages offered by an integral representation using diffracting component waves in solving wave propagation problems, deterministic as well as stochastic, in multiscale media. The component waves are constructed in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::60661fcab4942d19b0ad888295841fe6
https://doi.org/10.1029/95rs02452
https://doi.org/10.1029/95rs02452
Publikováno v:
Journal of Atmospheric and Terrestrial Physics. 57:51-63
Observations of the HF skywave ionospheric channel during one year over three paths within Sweden are reported. The major aim of the work was to gain insight into prevailing propagation effects on representative fixed circuit paths at auroral latitud
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1a3cb811ff201cc294c6fb2177bc1469
https://doi.org/10.1016/0021-9169(93)e0020-a
https://doi.org/10.1016/0021-9169(93)e0020-a