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  2. Category:3rd-century BC poems - Wikipedia

    en.wikipedia.org/wiki/Category:3rd-century_BC_poems

    Download as PDF; Printable version; In other projects Wikidata item; ... Pages in category "3rd-century BC poems" The following 32 pages are in this category, out of ...

  3. Weather radar - Wikipedia

    en.wikipedia.org/wiki/Weather_radar

    Weather radar in Norman, Oklahoma with rainshaft Weather (WF44) radar dish University of Oklahoma OU-PRIME C-band, polarimetric, weather radar during construction. Weather radar, also called weather surveillance radar (WSR) and Doppler weather radar, is a type of radar used to locate precipitation, calculate its motion, and estimate its type (rain, snow, hail etc.).

  4. Doppler radar - Wikipedia

    en.wikipedia.org/wiki/Doppler_radar

    Doppler Effect: Change of wavelength and frequency caused by motion of the source. The formula for radar Doppler shift is the same as that for reflection of light by a moving mirror. [3] There is no need to invoke Albert Einstein's theory of special relativity, because all observations are made in the same frame of reference. [4]

  5. Doppler tracking - Wikipedia

    en.wikipedia.org/wiki/Doppler_tracking

    Doppler tracking.The Doppler effect allows the measurement of the distance between a transmitter from space and a receiver on the ground by observing how the frequency received from the transmitter changes as it approaches the transmitter, is overhead, and moves away.

  6. Doppler effect - Wikipedia

    en.wikipedia.org/wiki/Doppler_effect

    The Doppler effect (also Doppler shift) is the change in the frequency of a wave in relation to an observer who is moving relative to the source of the wave. [ 1 ] [ 2 ] [ 3 ] The Doppler effect is named after the physicist Christian Doppler , who described the phenomenon in 1842.

  7. Doppler radio direction finding - Wikipedia

    en.wikipedia.org/wiki/Doppler_radio_direction...

    Doppler radio direction finding, also known as Doppler DF, is a radio direction-finding method that generates accurate bearing information with minimal electronics. It is best suited to applications in VHF and UHF frequencies and takes only a short time to indicate a direction. This makes it suitable for measuring the location of the vast ...

  8. Photoacoustic Doppler effect - Wikipedia

    en.wikipedia.org/wiki/Photoacoustic_Doppler_effect

    The photoacoustic Doppler effect is a type of Doppler effect that occurs when an intensity modulated light wave induces a photoacoustic wave on moving particles with a specific frequency. The observed frequency shift is a good indicator of the velocity of the illuminated moving particles. A potential biomedical application is measuring blood flow.

  9. Christian Doppler - Wikipedia

    en.wikipedia.org/wiki/Christian_Doppler

    Christian Andreas Doppler (/ ˈ d ɒ p l ər /; German: [ˈkʁɪstiaːn ˈdɔplɐ]; 29 November 1803 – 17 March 1853) [1] was an Austrian mathematician and physicist.He formulated the principle – now known as the Doppler effect – that the observed frequency of a wave depends on the relative speed of the source and the observer.

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