backscatter

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.
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.
ii. In radar, the portion of the microwave energy scattered by the terrain surface directly back toward the antenna.

Aviation dictionary. 2014.

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  • Backscatter — bezeichnet die Rückstreuung von Wellen, Partikeln oder Signalen. Der Begriff wird u. a. angewendet in: den Natur /Ingenieurwissenschaften, siehe Rückstreuung im Internet, siehe Backscatter (E Mail) der Sicherheitstechnik (Backscatter X ray… …   Deutsch Wikipedia

  • Backscatter — For other uses, see Backscatter (disambiguation). In physics, backscatter (or backscattering) is the reflection of waves, particles, or signals back to the direction they came from. It is a diffuse reflection due to scattering, as opposed to… …   Wikipedia

  • backscatter — also backscattering noun Date: 1940 the scattering of radiation or particles in a direction opposite to that of the incident radiation due to reflection from particles of the medium traversed; also the radiation or particles so reversed in… …   New Collegiate Dictionary

  • backscatter — Refers to a portion of the laser energy that is scattered back in the direction of the seeker by an obscurant. See also laser …   Military dictionary

  • backscatter — /bak skat euhr/, n. Physics. the deflection of nuclear particles or of radiation in a scattering process through an angle greater than 90°. Also, backscattering. [1955 60; BACK2 + SCATTER] * * * …   Universalium

  • backscatter — 1. noun a) The deflection of particles and/or radiation by nuclear and/or electromagnetic forces through angles greater than 90 degrees to the original direction of travel. b) The particles and/or radiation deflected in this manner. 2. verb …   Wiktionary

  • backscatter — Secondary radiation deflected more than 90° from the primary beam. See scattered radiation. * * * back·scat·ter (bakґskat ər) in radiology, radiation deflected by scattering processes at angles greater than 90 degrees to the original… …   Medical dictionary

  • backscatter — n. deflection of nuclear particles or deviation of radiation in a scattering procedure through angles greater than ninety degrees; radiation or particles deflected in this manner v. scatter radiation by atoms of the medium through which it passes …   English contemporary dictionary

  • backscatter — noun 1》 Physics deflection of radiation or particles through an angle of 180°. 2》 Photography light from a flashgun or other light source that is deflected directly into a lens. verb Physics deflect (radiation or particles) through an angle of… …   English new terms dictionary

  • backscatter — back•scat•ter [[t]ˈbækˌskæt ər[/t]] n. 1) phs the deflection of radiation by scattering in a direction opposite to the direction of incidence 2) phs radiation scattered in this manner • Etymology: 1955–60 …   From formal English to slang

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