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 interface between DVA compounds, containing different EPDM concentrations, was located with the SEM using a sensitive backscattered electron detector.
5 % measurement of little "a" will require rejection efficiency greater than 80 % for the backscattered electrons.
Since the elastic scattering term is essentially the size of the target atom as seen by an electron beam (for backscattered electrons), Armstrong felt this might explain the observed correlation of various electron-solid interactions with mass fraction.
The microscope has an improved objective lens electron detector system, which can be continuously adjusted to allow for imaging with secondary or backscattered electrons.