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 ?
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.
Schauer advocates strict regulatory control of the backscatter scanners in order to ensure that their use is consistent with the goals and objectives of radiation protection, which include justification (benefits exceed cost or harm), optimisation (exposures are kept as low as reasonably achievable) and limitation (individual doses are limited).
Our unique SpammerTrap software is sophisticated enough to prohibit backscatter," said Michael Scheidell, chief technology officer for SECNAP.
OmniView([TM]) Gantry: The only multi-view relocatable system available today that combines high-energy transmission inspection plus multiple Z Backscatter X-ray views.
X-ray backscatter technology uses a narrow, low intensity x-ray beam, scanned over the body's surface at high speed.
Beta electrons that scatter from any material before hitting the detector will lose energy, leading to the same problem as detector backscatter.
In one case, it seems, electrons go around the ring once; in the other case they backscatter and go around twice.
AS&E([R])) (NASDAQ: ASEI), a leading worldwide supplier of innovative X-ray detection solutions, announced today the introduction of the MobileSearch([TM])High-Energy (HE) cargo and vehicle inspection system with both high-energy transmission and proprietary Z Backscatter X-ray imaging for detecting threats and contraband including weapons, explosives, drugs, and currency.
The SmartCheck Z Backscatter Personnel Screening System was piloted at Phoenix Sky Harbor International Airport in February 2007.
The Z Backscatter personnel screening system from American Science and Engineering of Billerica, Massachusetts, offers screening for contraband and threats hidden under a person's clothing.