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FREQUENCY SCANNING [7 records]

Record 1 2015-06-03

English

Subject field(s)
  • Titles of Federal Government Programs (Canadian)
  • Geophysics
  • Astronomy
CONT

CGSM is funded primarily by the Canadian Space Agency, and consists of networks of imagers, meridian scanning photometers, riometers, magnetometers, digital ionosondes, and High Frequency SuperDARN radars. The overarching objective of CGSM is to provide synoptic observations of the spatio-temporal evolution of the ionospheric thermodynamics and electrodynamics at auroral and polar latitudes over a large region of Canada.

French

Domaine(s)
  • Titres de programmes fédéraux (Gouvernement canadien)
  • Géophysique
  • Astronomie
DEF

[...] réseau canadien d'instruments terrestres qui sont voués au suivi et à l'étude de l'activité géomagnétique circumterrestre et des phénomènes météorologiques dans l'espace.

OBS

Il comprend des radars haute fréquence, des imageurs du ciel, des modèles informatiques et des portails de données répartis dans tout le pays.

Spanish

Save record 1

Record 2 2011-08-26

English

Subject field(s)
  • Sonar and Underwater Detection (Military)
  • Applications of Electronics
  • Sea Operations (Military)
CONT

The most recent techniques-electronic scanning antenna(the mechanical types having been overtaken) with elimination of clutter, enemy counter-measures or wave echoes, very high "frequency agility, "in-depth echo processing etc.-are all designed to allow the vessel under all circumstances to retain its detection effectiveness and to locate as quickly as possible even the swiftest adversaries.

Key term(s)
  • in depth echo processing

French

Domaine(s)
  • Sonar et détection sous-marine (Militaire)
  • Applications de l'électronique
  • Opérations en mer (Militaire)
OBS

Les techniques les plus récentes-antenne à balayage électronique, et non plus mécanique avec élimination des échos parasites, contre mesures de l'ennemi ou échos de vagues, très grande agilité en fréquence, traitement poussé des échos, etc., - ont toutes pour but de permettre au navire de garder en toutes conditions son efficacité de détection et de repérer le plus rapidement possible les hostiles les plus véloces.

Spanish

Save record 2

Record 3 1994-04-27

English

Subject field(s)
  • Television (Radioelectricity)
  • Video Technology
CONT

The field rate of 60 Hz is the vertical scanning frequency. This is the rate at which the electron beam completes its cycles of vertical motion, from top to bottom and back to top again. Therefore, vertical deflection circuits for either the camera tube or the picture tube operate at 60 Hz. The time of each vertical scanning cycle for one field is 1/60 s.

French

Domaine(s)
  • Télévision (Radioélectricité)
  • Vidéotechnique
CONT

La fréquence de balayage vertical est égale à la fréquence de trame, soit 60 Hz. C'est la fréquence à laquelle le faisceau électronique accomplit ses cycles de mouvement vertical de haut en bas et de retour en haut. Par conséquent, les circuits de déviation verticale du tube analyseur et du tube image fonctionnent à la fréquence de 60 Hz. La période de chaque cycle de balayage vertical d'une trame est de 1/60 s.

Spanish

Save record 3

Record 4 1989-10-12

English

Subject field(s)
  • Radar, Radio Guidance and Goniometry
DEF

An electronic device in the form of a scanning filter which provides a frequency analysis of the amplitude-modulated back-scattered signal.

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie

Spanish

Save record 4

Record 5 1987-07-20

English

Subject field(s)
  • Radio Waves
  • Radar, Radio Guidance and Goniometry
CONT

In frequency scanning systems, frequency is employed to control the phase relationship among the elements in such a way that each frequency produces a unique beam position.

French

Domaine(s)
  • Ondes radioélectriques
  • Radar, radioguidage et radiogoniométrie

Spanish

Save record 5

Record 6 1979-12-10

English

Subject field(s)
  • The Sun (Astronomy)
CONT

The Culgoora radioheliograph, commissioned in 1967, was initially designed to operate at a frequency of 80 MHz. Scanning a north-south line of points across a field of view of approximately 2 E-W X 1. 6 N-S yields a two-dimensional image of the solar corona once per second.(...) Here we report the addition of a second operating frequency, 160 MHz, for the radioheliograph and work in progress to add a third frequency, 43. 25 MHz.

OBS

heliograph: an instrument for recording the duration and intensity of sunshine.

French

Domaine(s)
  • Soleil (Astronomie)
CONT

[Le] radiohéliographe étudiera la structure de la couronne solaire et ses variations d'homogénéité, ainsi que ses relations avec le milieu interplanétaire.

OBS

héliographe: Instrument servant à mesurer la durée de l'insolation (...)

Spanish

Save record 6

Record 7 1976-06-19

English

Subject field(s)
  • Electronics
OBS

horizontal deflecting plate-plateau de déviation horizontale. horizontal scanning frequency : fréquence de balayage horizontal; d’exploration horizontale. horizontal deflection-déviation horizontale

French

Domaine(s)
  • Électronique

Spanish

Save record 7

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