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FREQUENCY SHIFT RADAR [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2023-02-27

English

Subject field(s)
  • Radar, Radio Guidance and Goniometry
  • Weather Stations and Meteorological Instruments and Equipment
CONT

Doppler weather radar. For many years radar has been used to provide information about the intensity and extent of rain and other forms of precipitation.... A major improvement in the capability of weather radar came about when engineers developed new radars that could measure the Doppler frequency shift in addition to the magnitude of the echo signal reflected from precipitation. The Doppler frequency shift is important because it is related to the radial velocity of the precipitation blown by wind(the component of the wind moving either toward or away from the radar installation). Since tornadoes, mesocyclones(which spawn tornadoes), hurricanes, and other hazardous weather phenomena tend to rotate, measurement of the radial wind speed as a function of viewing angle will identify rotating weather patterns.

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie
  • Stations, instruments et équipements météorologiques
CONT

[Un] radar météorologique à effet Doppler sert à évaluer l'intensité des perturbations et la distance à laquelle celles-ci se trouvent. Il est également capable de mesurer la vitesse et l'orientation du mouvement de ces perturbations.

Spanish

Save record 1

Record 2 2006-06-14

English

Subject field(s)
  • Remote Sensing
  • Radar, Radio Guidance and Goniometry
  • Operations (Air Forces)
DEF

Any form of radar which detects motion relative to a reflecting surface by measuring the frequency shift of reflected radio energy due to the motion of the observer or of the reflecting surface.

CONT

Doppler radar provides the pilot or navigator with a continuous indication of the drift angle and ground speed of the aircraft.

CONT

Forecasting centers will get new computers, Doppler radar for more precise rainfall measurements, and interactive models designed to let forecasters explore a range of possible scenarios.

OBS

doppler radar: term and definition standardized by NATO.

OBS

In the NATO Glossary "Doppler" is written incorrectly in lower case.

OBS

Doppler radar: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG).

French

Domaine(s)
  • Télédétection
  • Radar, radioguidage et radiogoniométrie
  • Opérations (Forces aériennes)
DEF

Radar qui détecte tout déplacement d'une surface réfléchissante en mesurant le décalage de fréquence de l'énergie radio réfléchie dû au déplacement de l'observateur ou de la surface réfléchissante.

CONT

Le radar Doppler est [...] un équipement de navigation qui permet de connaître à tout instant la position de l'avion ou de l'hélicoptère qui le porte par la mesure de la vitesse au-dessus du sol.

OBS

radar Doppler : terme uniformisé par le Groupe de travail de terminologie de l'artillerie antiaérienne et par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

OBS

radar doppler : terme et définition normalisés par l'OTAN.

OBS

Dans le Glossaire OTAN, «Doppler» est écrit à tort en minuscules.

Spanish

Campo(s) temático(s)
  • Teledetección
  • Guía radárica, radioguía y radiogoniometría
  • Operaciones (Fuerzas aéreas)
DEF

Radar que detecta el movimiento relativo con respecto a una superficie de reflexión midiendo el cambio de fase de la energía de radiofrecuencia reflejada debida al movimiento del observador o de la superficie de reflexión.

Save record 2

Record 3 1987-01-19

English

Subject field(s)
  • Aeroindustry
  • Measuring Instruments
  • Lasers and Masers
CONT

The laser(or lidar) velocimeter [lidar=light radar] operates in a fashion entirely analogous to that of the airborne Doppler weather radars likely soon to be available for detecting turbulence in storm cells. As with radars, the device detects air movements by observing the motion of particles suspended in the air and carried with it. The only significant difference is that a beam of coherent infrared radiation is used to scan ahead of the aircraft, instead of a beam(or series of pulses) of radio energy in the considerably longer-wavelength microwave band. The frequency of the back-scattered echoes or reflections undergoes Doppler shift detection by standard heterodyning techniques, which involve comparing the frequency of the reflected illumination with that of the original laser beam. Any reflecting object or material which has motion relative to the transmitter/receiver will cause a detectable shift in frequency, which can be isolated from the transmitter's own proper motion(over the ground) and thus yield a precise indication of the speed at which the air is moving several hundred metres in front of the aircraft. From this data, it is easy to compute what the air speed of the aircraft will be when it reaches that particular patch of air in a few seconds’ time [and hence detect possible turbulence ahead].

French

Domaine(s)
  • Constructions aéronautiques
  • Appareils de mesure
  • Masers et lasers
CONT

Le principe de fonctionnement du vélocimètre à laser (ou lidar) est exactement le même que celui des radars météorologiques Doppler de bord, qui doivent être mis en service prochainement pour la détection des turbulences dans les systèmes d'orages.

Spanish

Save record 3

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