backscatter


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backscatter

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Backscatter allows communication within the skip zone. Normally, station within skip zone cannot hear transmitting station. In this case Y cannot hear station X. Station, however, Z can hear station X by normal ionospheric propagation. On the other hand, when backscatter is strong enough station Y can hear station X, even though Y is within the skip zone.
i. A form of ionospheric propagation of electromagnetic waves via the E and F layers. These layers are highly ionized and have properties of reflecting electromagnetic waves back to the earth. Normally, almost all electromagnetic signals are returned to the earth at roughly equivalent angles of incidence. However, some amount of electromagnetic energy is scattered in all directions. Some energy may be reflected back toward the transmitting station into the skip zone. A receiving station within this skip zone is thus able to receive the transmission. Also called echo.
ii. In radar, the portion of the microwave energy scattered by the terrain surface directly back toward the antenna.
References in periodicals archive ?
The backscatter wireless communication is the modulation method for ultra-low-power.
In sloped regions, there are radiometric distortions in the backscatter coefficient retrieved using (1), since [[sigma].
org/article/tsa-removes-x-ray-body-scanners-from-major-airports) broke the story Friday with a revealing look at how the backscatters, as the X-ray scanners are known, have suddenly vanished over the span of a month.
The backscatter scanners have a maximum dose of less than 1/2500th of that limit (less than 0.
Several transects were extended where significant backscatter continued beyond the original endpoints used during the first pass.
Critics of security screening acknowledge that doses from backscatter X-ray systems are very low and safe for an individual," he stated.
The sample was microtomed and RuO4 stained and a Robinson electron backscatter detector was used to enhance contrast between the phases.
The Company will also debut a new top-down transmission option on the Z Portal([R]) screening system that complements the system's three Z Backscatter views for enhanced metallic detection in vehicles.
M2 EQUITYBITES-January 6, 2011-AS&E wins order in Yemen for two more Z Backscatter Vans for explosive detection(C)2011 M2 COMMUNICATIONS http://www.
The United States Transportation Security Administration (TSA) has announced contract awards to begin testing millimetre wave imaging machines, as well as additional backscatter machines, at airport security checkpoints in Phoenix, Los Angeles, and New York's JFK in the coming months.
The Gemini Parcel X-ray Inspection System from American Science & Engineering of Billerica, Massachusetts, combines dual-energy transmission with patented Z Backscatter technology for the most comprehensive threat detection available for parcel, baggage, and mail screening.
There is some probability for an electron to backscatter out of a beta detector without depositing its full energy.