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Doppler$22701$ - перевод на Английский
![Colour flow ultrasonography (Doppler) of a [[carotid artery]] – scanner and screen](https://commons.wikimedia.org/wiki/Special:FilePath/CarotidDoppler1.jpg?width=200 "Colour flow ultrasonography (Doppler) of a [[carotid artery]] – scanner and screen")
![Change of [[wavelength]] caused by motion of the source.](https://commons.wikimedia.org/wiki/Special:FilePath/Doppler effect diagrammatic.svg?width=200 "Change of [[wavelength]] caused by motion of the source.")
![LEO]]: orbit altitude <math>h</math> = 750 km). Fixed ground station.<ref>Otilia Popescuy, Jason S. Harrisz and Dimitrie C. Popescuz, Designing the Communica- tion Sub-System for Nanosatellite CubeSat Missions: Operational and Implementation Perspectives, 2016, IEEE</ref>](https://commons.wikimedia.org/wiki/Special:FilePath/SatDoppler.png?width=200 "LEO]]: orbit altitude <math>h</math> = 750 km). Fixed ground station.<ref>Otilia Popescuy, Jason S. Harrisz and Dimitrie C. Popescuz, Designing the Communica- tion Sub-System for Nanosatellite CubeSat Missions: Operational and Implementation Perspectives, 2016, IEEE</ref>")
![Doppler Spread]]) and <math>f_{\rm D,Sat}</math> is the additional Doppler shift due to the satellite moving.](https://commons.wikimedia.org/wiki/Special:FilePath/SatDopplerSpectrum.png?width=200 "Doppler Spread]]) and <math>f_{\rm D,Sat}</math> is the additional Doppler shift due to the satellite moving.")
![Doppler navigation system in the [[National Electronics Museum]]](https://commons.wikimedia.org/wiki/Special:FilePath/Doppler Radar Navigation Aid - National Electronics Museum - DSC00364.JPG?width=200 "Doppler navigation system in the [[National Electronics Museum]]")
![Doppler weather radar]] unit was obtained from the US Navy in the 1950s](https://commons.wikimedia.org/wiki/Special:FilePath/Wea01227 - Flickr - NOAA Photo Library.jpg?width=200 "Doppler weather radar]] unit was obtained from the US Navy in the 1950s")
Определение
Википедия
The relativistic Doppler effect is the change in frequency (and wavelength) of light, caused by the relative motion of the source and the observer (as in the classical Doppler effect), when taking into account effects described by the special theory of relativity.
The relativistic Doppler effect is different from the non-relativistic Doppler effect as the equations include the time dilation effect of special relativity and do not involve the medium of propagation as a reference point. They describe the total difference in observed frequencies and possess the required Lorentz symmetry.
Astronomers know of three sources of redshift/blueshift: Doppler shifts; gravitational redshifts (due to light exiting a gravitational field); and cosmological expansion (where space itself stretches). This article concerns itself only with Doppler shifts.
