Doppler radar

DopplerDoppler navigationDoppler navigation radarradarDoppler beaconsDoppler navigational radarDoppler radar altimeterdoppler ranging radarDoppler signalsdoppler tracking radar
A Doppler radar is a specialized radar that uses the Doppler effect to produce velocity data about objects at a distance.wikipedia
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Radar gun

speed gunradar speed gunradar
Doppler radars are used in aviation, sounding satellites, Major League Baseball's StatCast system, meteorology, radar guns, radiology and healthcare (fall detection and risk assessment, nursing or clinic purpose ), and bistatic radar (surface-to-air missiles).
A radar speed gun is a Doppler radar unit that may be hand-held, vehicle-mounted or static.

Continuous-wave radar

continuous wave radarcontinuous wave illuminating radarscontinuous-wave
Coherent pulsed (CP),
Continuous-wave (CW) radar uses Doppler, which renders the radar immune to interference from large stationary objects and slow moving clutter.

Radar

radar stationradarsradar system
A Doppler radar is a specialized radar that uses the Doppler effect to produce velocity data about objects at a distance.
Most modern radar systems use this principle into Doppler radar and pulse-Doppler radar systems (weather radar, military radar).

Pulse-Doppler radar

Dopplerpulse-Dopplerpulse doppler
Most modern weather radars use the pulse-Doppler technique to examine the motion of precipitation, but it is only a part of the processing of their data.
Doppler radar (non-pulsed; used for navigation systems)

Green Satin radar

Green Satin
One early example of such a system was the Green Satin radar used in the English Electric Canberra.
Green Satin was a doppler radar system developed by the Royal Air Force as an air navigation aid.

Doppler effect

Dopplerdoppler shiftDoppler shifts
A Doppler radar is a specialized radar that uses the Doppler effect to produce velocity data about objects at a distance. The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the difference between the observed frequency and the emitted frequency of a wave for an observer moving relative to the source of the waves.

Microwave

microwavesmicrowave radiationmicrowave tube
It does this by bouncing a microwave signal off a desired target and analyzing how the object's motion has altered the frequency of the returned signal.

Radial

This variation gives direct and highly accurate measurements of the radial component of a target's velocity relative to the radar.

Aviation

air transportairflying
Doppler radars are used in aviation, sounding satellites, Major League Baseball's StatCast system, meteorology, radar guns, radiology and healthcare (fall detection and risk assessment, nursing or clinic purpose ), and bistatic radar (surface-to-air missiles).

Major League Baseball

MLBMajor LeagueMajor Leagues
Doppler radars are used in aviation, sounding satellites, Major League Baseball's StatCast system, meteorology, radar guns, radiology and healthcare (fall detection and risk assessment, nursing or clinic purpose ), and bistatic radar (surface-to-air missiles).

Statcast

exit velocityStatCast system
Doppler radars are used in aviation, sounding satellites, Major League Baseball's StatCast system, meteorology, radar guns, radiology and healthcare (fall detection and risk assessment, nursing or clinic purpose ), and bistatic radar (surface-to-air missiles).

Meteorology

meteorologistmeteorologicalmeteorologists
Doppler radars are used in aviation, sounding satellites, Major League Baseball's StatCast system, meteorology, radar guns, radiology and healthcare (fall detection and risk assessment, nursing or clinic purpose ), and bistatic radar (surface-to-air missiles).

Radiology

radiologistradiologistsradiological
Doppler radars are used in aviation, sounding satellites, Major League Baseball's StatCast system, meteorology, radar guns, radiology and healthcare (fall detection and risk assessment, nursing or clinic purpose ), and bistatic radar (surface-to-air missiles).

Health care

healthcarehealth servicesmedical care
Doppler radars are used in aviation, sounding satellites, Major League Baseball's StatCast system, meteorology, radar guns, radiology and healthcare (fall detection and risk assessment, nursing or clinic purpose ), and bistatic radar (surface-to-air missiles).

Bistatic radar

bistaticbi-staticbi-static system
Doppler radars are used in aviation, sounding satellites, Major League Baseball's StatCast system, meteorology, radar guns, radiology and healthcare (fall detection and risk assessment, nursing or clinic purpose ), and bistatic radar (surface-to-air missiles).

Surface-to-air missile

SAMsurface-to-air missilesanti-aircraft missile
Doppler radars are used in aviation, sounding satellites, Major League Baseball's StatCast system, meteorology, radar guns, radiology and healthcare (fall detection and risk assessment, nursing or clinic purpose ), and bistatic radar (surface-to-air missiles).

Weather radar

Doppler weather radarradarDoppler radar
Most modern weather radars use the pulse-Doppler technique to examine the motion of precipitation, but it is only a part of the processing of their data.

Precipitation

rainfallhydrometeorannual precipitation
Most modern weather radars use the pulse-Doppler technique to examine the motion of precipitation, but it is only a part of the processing of their data.

Christian Doppler

Christian Andreas DopplerDoppler, ChristianDoppler, Christian Johann
The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the difference between the observed frequency and the emitted frequency of a wave for an observer moving relative to the source of the waves.

Frequency

frequenciesperiodperiodic
The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the difference between the observed frequency and the emitted frequency of a wave for an observer moving relative to the source of the waves.

Electromagnetic radiation

electromagnetic waveelectromagnetic waveselectromagnetic
Since with electromagnetic radiation like microwaves frequency is inversely proportional to wavelength, the wavelength of the waves is also affected.

Albert Einstein

EinsteinA. EinsteinEinstein, Albert
There is no need to invoke Einstein's theory of special relativity, because all observations are made in the same frame of reference.

Special relativity

special theory of relativityrelativisticspecial
There is no need to invoke Einstein's theory of special relativity, because all observations are made in the same frame of reference.

Speed of light

clight speedvelocity of light
The result derived with c as the speed of light and v as the target velocity gives the shifted frequency (f_r) as a function of the original frequency (f_t) :

Look-down/shoot-down

look downlook down shoot downlook-down
That provides Look-down/shoot-down capability.