NDLI: Radiofrequency speckle in mountainous terrain

Content Provider	IEEE Xplore Digital Library
Author	Breton, D.J. Arcone, S.A.
Copyright Year	2015
Description	Author affiliation: Signature Phys. Branch, Cold Regions Res. & Eng. Lab., Hanover, NH, USA (Breton, D.J.; Arcone, S.A.)
Abstract	We report the results of several field experiments to characterize broadband UHF radiofrequency propagation through mountainous terrain and into deep shadow zones. Utilizing an existing digital broadcast television station (center frequency 497 MHz with a standard 6 MHz bandwidth) as our signal source, we performed spectrum analyzer surveys to determine both spatial and spectral characteristics of signals present within deep shadow zones. Directional surveys revealed that RF power within shadow zones arrives primarily via adjacent topographic reflectors and that these reflected signals suffer significant frequency selective fading. Translational surveys within shadow zones showed slow changes in the reflected spectrum for longitudinal translations and rapid spectrum changes for transverse translations. The frequency selective fading and translation direction dependence of the reflected spectra suggest a phenomenon analogous to laser speckle, caused by the coherent scattering of the RF signal from the rough surface of adjacent topographic reflectors.
Sponsorship	IEEE
Starting Page	997
Ending Page	998
File Size	3184020
Page Count	2
File Format	PDF
e-ISBN	9781479978151
DOI	10.1109/APS.2015.7304886
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-07-19
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Speckle Scattering Transmitters Antenna measurements Broadband communication Surface topography
Content Type	Text
Resource Type	Article

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2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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