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FREQUENCY SCAN [5 records]

Record 1 2023-05-26

English

Subject field(s)
  • Information Processing (Informatics)
  • General Conduct of Military Operations
DEF

The compilation of parametric, identification and prioritization data associated with one or more threat systems.

OBS

A mission data set is normally tailored to meet the requirements of a platform operating in a specific theatre of operations.

OBS

Parametric data includes frequency ranges, pulse repetition intervals, scan rates and scan types.

OBS

mission data set: designation and definition officially approved by the Joint Terminology Panel.

French

Domaine(s)
  • Traitement de l'information (Informatique)
  • Conduite générale des opérations militaires
DEF

Recueil de données paramétriques et de données sur l'identification et la priorité associées à un ou plusieurs systèmes de menaces.

OBS

Les ensembles de données de mission sont normalement préparés selon les besoins d'une plateforme qui doit exécuter des fonctions dans un théâtre d'opérations particulier.

OBS

Les données paramétriques comprennent des gammes de fréquence, des intervalles de répétition des impulsions, des fréquences de balayage et des types de balayage.

OBS

ensemble de données de mission; jeu de données de mission : désignations et définition uniformisées par le Groupe d'experts en terminologie interarmées.

Spanish

Save record 1

Record 2 2007-04-25

English

Subject field(s)
  • Magnetic Resonance Imaging
DEF

A preselected set of defined RF [radio frequency] and gradient pulses, usually repeated many times during a scan, wherein the time interval between pulses and the amplitude and shape of the gradient waveforms will control NMR [nuclear magnetic resonance] signal reception and affect the characteristics of the MR [magnetic resonance] images.

OBS

Typical pulse sequences: spin echo, gradient echo, TurboSE, Inversion Recovery ...

French

Domaine(s)
  • Imagerie par résonance magnétique
DEF

[...] succession d'impulsions et de temps morts utilisée pour exciter les moments magnétiques des protons [...]

Key term(s)
  • séquence d'impulsion

Spanish

Save record 2

Record 3 2003-06-25

English

Subject field(s)
  • Television (Radioelectricity)
DEF

The specifications for color television as defined by the NTSC committee, which include :(a) 525 scan lines,(b) broadcast bandwidth of 4 MHz,(c) line frequency of 15. 75 KHz,(d) frame frequency of 30 frames per second, and(e) color subcarrier frequency of 3. 58 MHz.

OBS

Term and definition taken from a document presented as a suggested first draft of the new IS 2382 part on Multimedia and Hypermedia.

OBS

NTSC: National Television Standards Committee.

Key term(s)
  • National Television Standards Committee format

French

Domaine(s)
  • Télévision (Radioélectricité)
OBS

NTSC : Comité national de normalisation de la télévision.

Spanish

Save record 3

Record 4 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 4

Record 5 1985-03-26

English

Subject field(s)
  • Computer Graphics
CONT

Color Burst Shifting. One of the most primitive techniques is to change the color of the whole screen by simply adding a color burst to the back porch of the sync signal and mixing in a little of the color burst frequency into the scan line. The generated color corresponds to the phrase difference between the color burst and the mixed signal.

Key term(s)
  • colour burst shifting

French

Domaine(s)
  • Infographie

Spanish

Save record 5

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