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CORRELATOR [14 records]

Record 1 2021-08-30

English

Subject field(s)
  • Acoustics (Physics)
  • Optics
  • Computer Graphics
CONT

[A] correlation product is most frequently implemented experimentally by means of two Fourier transforms in cascade, although object-space setups such as the acoustooptic correlator, have also been proposed.

French

Domaine(s)
  • Acoustique (Physique)
  • Optique
  • Infographie

Spanish

Save record 1

Record 2 2021-08-30

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
DEF

A … joint transform correlator where separate lenses are used to Fourier transform the object and template images.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 2

Record 3 2012-01-09

English

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

A device that measures the coherence between two wave systems to detect weak signals lost in noise.

CONT

While most of existing SAR [synthetic aperture radar] image registration methods try to pre-filter the speckle noise before applying an optical correlator, here we estimate the correlation directly from complex images.

French

Domaine(s)
  • Mesures à distance (Télécommunications)
  • Radar, radioguidage et radiogoniométrie
DEF

Dispositif mesurant la cohérence entre deux systèmes d'onde afin de détecter les signaux faibles plus ou moins perdus dans le bruit.

CONT

Pour répondre à cette interrogation, un concept d'expérience original a été imaginé : deux impulsions laser ultrabrèves de longueurs d'onde différentes mais dont la somme de fréquence est suffisante pour exciter la fluorescence d'un colorant dilué dans la microcavité sont décalées temporellement (expérience pompe-sonde). La fluorescence n'est excitée que lorsque les deux paquets d'onde se recouvrent spatialement : on réalise ainsi un corrélateur optique.

Spanish

Campo(s) temático(s)
  • Medidas de distancia (Telecomunicaciones)
  • Guía radárica, radioguía y radiogoniometría
CONT

Hace más de 30 años Van der Lugt inició una época de expansión de la óptica de Fourier al introducir por primera vez una exitosa configuración para el procesado óptico de datos - el llamado correlador óptico. Esta operación está basada en la capacidad de una lente convexa de realizar una operación proporcional a la transformada de Fourier en dos dimensiones de un objeto y cuya respuesta está localizada en el plano focal.

Save record 3

Record 4 2011-12-12

English

Subject field(s)
  • Satellite Telecommunications
  • Mathematical Geography
  • Radar, Radio Guidance and Goniometry
DEF

A technique in which radio telescopes hundreds of kilometres apart can be joined electronically to form an array.

OBS

Signals received by the various antennas are brought to a central correlator by means of radio or fibre-optic links. A well-known example is the MERLIN array.

OBS

Long Baseline Interferometry (LBI): term and abbreviation used at Natural Resources Canada - Earth Sciences Sector.

Key term(s)
  • long base-line interferometry

French

Domaine(s)
  • Télécommunications par satellite
  • Géographie mathématique
  • Radar, radioguidage et radiogoniométrie
CONT

L'interférométrie longue base consiste à utiliser au moins deux télescopes indépendants dont on recombine les faisceaux de façon cohérente. C'est le principe utilisé pour obtenir une haute résolution angulaire, supérieure à la limite de diffraction de pupilles uniques.

CONT

[...] l'interférométrie longue base a permis de gagner un ordre de grandeur en résolution angulaire par rapport aux télescopes mono-pupillaires.

OBS

interférométrie à longue base (ILB) : terme et abréviation en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Save record 4

Record 5 2009-11-08

English

Subject field(s)
  • Scientific Instruments
  • Applications of Electronics
CONT

The invention concerns an electronic correlator for the evaluation of stereo-couples of photographs. Said electronic correlator comprises a normal correlator into which non-delayed signals are fed which in turn are derived from homologous points of each of the photographs of said stereo-couples.

OBS

electronic correlator : term used at Natural Resources Canada-Earth Sciences Sector.

Key term(s)
  • electronical correlator

French

Domaine(s)
  • Instruments scientifiques
  • Applications de l'électronique
OBS

corrélateur électronique : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Save record 5

Record 6 2007-02-08

English

Subject field(s)
  • Radar, Radio Guidance and Goniometry
  • Surveillance, Detection and Reconnaissance (Military)
CONT

The enhanced tactical radar correlator(ETRAC) mission is to provide Army corps commander with accurate, reliable and timely imagery-based battlefield intelligence derived from the all-weather, day and night real-time high resolution advanced synthetic aperture radar system-2(ASARS-2) carried aboard the Air Force's U-2 aircraft.

OBS

enhanced tactical radar correlating system; ETRACS: term and abbreviation extracted from a list of terms on unmanned aerial vehicles submitted by the Department of National Defence.

Key term(s)
  • enhanced tactical radar correlater
  • enhanced tactical radar correlater system

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie
  • Surveillance, détection et reconnaissance (Militaire)

Spanish

Save record 6

Record 7 2007-01-13

English

Subject field(s)
  • Measuring Instruments
  • Acoustics (Physics)
  • Sewers and Drainage
CONT

Acoustic correlator automatically utilizes passive sound pattern matching to automatically detect a listening device.

French

Domaine(s)
  • Appareils de mesure
  • Acoustique (Physique)
  • Égouts et drainage
DEF

[Appareil] qui localise précisément les fuites [d'eau] en analysant les variations sonores à l'intérieur [d'une] canalisation.

Spanish

Save record 7

Record 8 2006-02-09

English

Subject field(s)
  • Optical Instruments
  • Optics
  • Scientific Measurements and Analyses
CONT

New digital photoelectric correlator... A simple electronic correlator for two-time photoelectric correlation measurements has been developed. It functions by registering the distribution of time intervals between pairs of photoelectric pulses. Its basic elements are a clock that is started by the first pulse and is used to digitize the time intervals, a pair of fast counters for counting subsequent pulses, and a set of data registers. The pulses are directed to one or the other counter alternately at regular clock intervals.

French

Domaine(s)
  • Instruments d'optique
  • Optique
  • Mesures et analyse (Sciences)
OBS

photoélectrique : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2004).

Spanish

Save record 8

Record 9 2006-01-24

English

Subject field(s)
  • Mathematical Geography
  • Remote Sensing
DEF

An optronic or computing instrument that correlates elements from images of the same scene whose spatial, spectral or time conditions are different.

OBS

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

French

Domaine(s)
  • Géographie mathématique
  • Télédétection
DEF

Dispositif optronique ou informatique qui, pour une même scène, permet l'apparition de corrélations entre les éléments des images, issues de conditions spatiales, spectrales ou temporelles différents.

OBS

corrélateur d'image : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Save record 9

Record 10 2003-06-23

English

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

Azimuth Correlator : Reduces noise and interference.

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie

Spanish

Save record 10

Record 11 2003-03-12

English

Subject field(s)
  • Telecommunications Transmission
  • Radiotelephony
CONT

The signal is filtered after the correlator so that the interfering signals are reduced by the ratio of the bandwidth before and after the correlator. This signal improvement is called the processing gain and is a major factor in determining the CDMA [code division multiple access] digital cellular system capacity. Other important parameters are the... efficiency of frequency reuse, number of cell sectors, and voice duty cycle.

French

Domaine(s)
  • Transmission (Télécommunications)
  • Radiotéléphonie

Spanish

Save record 11

Record 12 2002-11-05

English

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

For the receiver, Garrison and Katzberg used a commercially available GPS-development kit, which included a 12-channel correlator chip fed by two radio-frequency(RF) front ends. They employed a zenith-oriented RHCP antenna mounted on top of an aircraft fuselage to receive the direct signal through one RF front end. A nadir-oriented LHCP antenna located on the bottom of the fuselage received the reflected signal through the other RF front end.

Key term(s)
  • radio frequency front end

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie
  • Télécommunications
CONT

Le parc d'antennes d'une superficie d'environ 380 m² (4 066 pi. ca.) comprend des services dans les bandes C et Ku avec liaisons ascendantes vers les satellites Anik. La grandeur des huit antennes varie de 2,4 mètres avec tête RF décentrée jusqu'à 8 mètres pour le système de repérage à impulsion simple.

Spanish

Save record 12

Record 13 1994-07-15

English

Subject field(s)
  • Artificial Intelligence
DEF

Process of adjusting an acquired image input pixel by pixel at the filter plane in order to adapt to non-ideal phase behavior in an optical correlator.

French

Domaine(s)
  • Intelligence artificielle
OBS

Projet de norme ISO sur la visionique.

Spanish

Save record 13

Record 14 1990-07-25

English

Subject field(s)
  • Computer Graphics
DEF

A correlator architecture where one input device and a permanent holographic store are employed.

French

Domaine(s)
  • Infographie

Spanish

Save record 14

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