Journal ArticleDOI
Mobile satellite system fade statistics for shadowing and multipath from roadside trees at UHF and L-band
J. Goldhirsh,W.J. Vogel +1 more
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TLDR
Field tests related to planned mobile satellite systems (MSS) were performed, and results that add to the existing database of propagation measurements at L-band (1.5 GHz) are described.Abstract:
Field tests related to planned mobile satellite systems (MSS) were performed, and results that add to the existing database of propagation measurements at L-band (1.5 GHz) are described. They are considered particularly useful in that propagation effects were studied systematically with repeated and controlled runs pertaining to different path elevation angles, road types, and path geometries defining shadowing and line-of-sight modes. In addition, simultaneous L-band and UHF measurements were performed for the purpose of establishing scaling factors applicable to previous UHF (870 MHz) results. The control of the experimental parameters was made possible by using a helicopter as the source platform and a mobile van which housed the receiver. >read more
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Land mobile satellite channel measurements and modeling
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Stastistical distributions in mobile communications using multiple scattering
TL;DR: A new model utilizing multiple scattering replaces the traditional subdivision of the total fading into a slow lognormal and a fast Rayleigh component, showing that part of the slow fading in general may not be due to shadowing, but rather the slow variation of the coupling between scatterers, when the mobile is moving.
References
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Journal ArticleDOI
Roadside tree attenuation measurements at UHF for land mobile satellite systems
J. Goldhirsh,W. Vogel +1 more
TL;DR: In this paper, the authors used a helicopter as a source platform and a van with receiver and data acquisition instrumentation for experiments conducted in October 1985 and March 1986 in Central Maryland.
Journal ArticleDOI
Tree attenuation at 869 MHz derived from remotely piloted aircraft measurements
Wolfhard J. Vogel,J. Goldhirsh +1 more
TL;DR: In this article, tree attenuation results are described based on data acquired from an experiment employing UHF transmissions at 869 MHz between a remotely piloted aircraft and a stationary vehicle, where the objective of the experiment was directed toward providing input to the land mobile satellite community where the extent of shadowing from roadside trees represents important information to be used for system design.
Journal ArticleDOI
Measurement and modeling of land mobile satellite propagation at UHF and L-band
W.J. Vogel,U.-S. Hong +1 more
TL;DR: In this article, a single-scatterer multipath model was introduced to duplicate some of the measured data and to show the dependence of power variations on satellite elevation angle, and the maximum fade was found to increase by the logarithm of the number of branches.
Journal ArticleDOI
Fade measurements at L-band and UHF in mountainous terrain for land mobile satellite systems
W.J. Vogel,J. Goldhirsh +1 more
TL;DR: In this paper, the results of a series of canyon passes in the Boulder, Colorado region of the USA were derived from an experiment performed by a helicopter as the source platform with a mobile van containing the receiver and data-acquisition system.
Journal ArticleDOI
Technology '88: communications
TL;DR: Big gains for mobile communications, the growing use of optical fiber, open networks for providers of services, and the success of the French videotex system are highlighted.
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