refraction of radio waves in the ionosphere

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• Radio propagation — is a term used to explain how radio waves behave when they are transmitted, or are propagated from one point on the Earth to another. [ H. P. Westman et al, (ed), Reference Data for Radio Engineers, Fifth Edition , 1968, Howard W. Sams and Co.,… …   Wikipedia

• Ionosphere — The ionosphere is a part of the upper atmosphere, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner …   Wikipedia

• Radio — is the transmission of signals, by modulation of electromagnetic waves with frequencies below those of visible light.Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of… …   Wikipedia

• Non-line-of-sight propagation — Non line of sight (NLOS) or near line of sight is a term used to describe radio transmission across a path that is partially obstructed, usually by a physical object in the innermost Fresnel zone. Many types of radio transmissions depend, to… …   Wikipedia

• Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …   Wikipedia

• Over-the-horizon radar — US Navy Relocatable Over the Horizon Radar station Over the horizon radar, or OTH (sometimes also beyond the horizon, or BTH), is a design concept for radar systems to allow them to detect targets at very long ranges, typically up to thousands of …   Wikipedia

• рефракция радиоволн в ионосфере — Изменение направления распространения радиоволн в ионосфере, вызванное изменением показателя преломления. [ГОСТ 25645.113 84] Тематики ионосфера земли Обобщающие термины ионосферное распространение радиоволн EN refraction of radio waves in the… …   Справочник технического переводчика

• Magneto-ionic double refraction — In telecommunication, magneto ionic double refraction is the combined effect of the Earth s magnetic field and atmospheric ionization, whereby a linearly polarized wave entering the ionosphere is split into two components called the orinary wave… …   Wikipedia

• Vertical plane — is used in radio to plot an antenna s relative field strength perpendicular to the ground (which directly affects a station s coverage area) on a polar graph. Normally the maximum of 1.000 or 0 dB is at the side (unless there is beam tilt), which …   Wikipedia

• telecommunications media — Introduction       equipment and systems metal wire, terrestrial and satellite radio, and optical fibre employed in the transmission of electromagnetic signals. Transmission media and the problem of signal degradation       Every… …   Universalium

• Skip distance — A skip distance is the distance a radio wave travels, usually including a hop in the ionosphere. A skip distance is a distance on the earth s surface between the two points where radio waves from a transmitter, refracted downwards by different… …   Wikipedia