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X BAND [8 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2007-10-10

English

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

The Arabel radar(phased array radar), manufacture by Thales, is a multifunction fire control, X band radar. It is in charge to track and to engage simultaneously numerous air target. Otherwise, it provides guidance for the Aster missiles.

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie
  • Acquisition d'objectif
DEF

Le radar Arabel (antenne radar à balayage électronique) fabriqué par Thales est un radar multifonctions bande X de conduite de tir. Il permet de suivre et d'engager simultanément de nombreuse cibles. Par ailleurs, il assure le guidage des missiles Aster.

Spanish

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Record 2 2007-01-31

English

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

A microwave range extending from approximately 5.2 to 10.9 GHz.

OBS

Depending on its purpose, an X band radar may operate either on a fixed frequency or allow an operator to select the operating frequency. X band radar is used for both military and civil applications, including surveillance radar and weather radar.

OBS

The symbol GHz stands for gigahertz which is a unit of frequency equal to one billion hertz.

OBS

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

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie
  • Télécommunications par satellite
DEF

Gamme d'hyperfréquences qui s'étend approximativement de 5,20 à 10,90 gigahertz.

OBS

Le gigahertz [GHz] est une unité de fréquence qui équivaut à un milliard de hertz.

OBS

bande X : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

PHR

Modulateur numérique en bande X.

Spanish

Campo(s) temático(s)
  • Guía radárica, radioguía y radiogoniometría
  • Telecomunicaciones por satélite
Save record 2

Record 3 2007-01-31

English

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

Frequency and designation with wavelengths within the range of approximately 100 microns to 2 metres.

CONT

The radar frequency bands were first designated by code letters for secrecy during World War II; these letters are still in common use, although the exact frequency intervals to which they apply have undergone some redefinition. They all fall within the UHF, SHF, and EHF radio frequency bands.... Radars operating in the S, C, and X bands are the ones mainly used for precipitation measurements. Attenuation of the transmitted radio frequency energy by atmospheric gases, precipitation, and cloud particles is severe for all frequency bands higher than X band, and even X band can suffer severe attenuation in heavy rain. Nevertheless, because radars operating in the K, Ka, and W bands are able to detect clouds, they are used for cloud observations even though they are not able to penetrate far through precipitation.

OBS

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

French

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

Une des bandes de fréquences utilisées par les radars dans les hyperfréquences.

OBS

Les bandes sont généralement désignées par des lettres : P, L, S, X, K, Q, V et C (recouvrant S et X partiellement, bien que ce découpage du spectre électromagnétique n'ait rien d'officiel).

OBS

bande radar : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Campo(s) temático(s)
  • Guía radárica, radioguía y radiogoniometría
  • Teledetección
Save record 3

Record 4 2002-03-22

English

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

The act by which microwaves enter a medium.

CONT

Radar Penetration. Radar wavelengths also influence penetrability below target tops to ground surfaces. Depth of penetration increases with wavelength : L and P band radar penetrate deeper than K or X bands. In forests, shorter wavelengths, such as C band, reflect mainly from the first leaves encountered, thus, from the canopy tops. At longer wavelengths, most tree leaves are too small to have much influence on backscatter, although branches will interact, so that canopies are penetrated to varying degrees.

OBS

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

French

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

Les travaux effectués à ce jour ont produit des résultats significatifs quant à la caractérisation du relief et de la rugosité de surface, et l'étude des propriétés diélectriques des matériaux qui conditionnent les capacités de pénétration du radar.

CONT

L'onde radar est réfléchie par une surface variable en fonction de la morphologie des arbres qui constituent la première dizaine de mètres en dessous du toit de la canopée. Les données radar, très précises en planimétrie, ne le sont donc qu'à 30 m près en altimétrie (épaisseur de la canopée moins la pénétration du radar). Elle sont par conséquent difficilement utilisables pour étudier la structure fine de la canopée forestière, mais peuvent être utiles pour détecter des structures à grande échelle, liée par exemple à la topographie.

OBS

pénétration du radar : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Save record 4

Record 5 2001-11-05

English

Subject field(s)
  • System Names
  • Optics
  • Land Forces
OBS

... the Fortis(Forward observation and reconnaissance thermal imaging system) operates in the 8-12 micron band with selectable fields of view of either 19 X 9 degrees or 4.

French

Domaine(s)
  • Noms de systèmes
  • Optique
  • Forces terrestres

Spanish

Save record 5

Record 6 2001-07-09

English

Subject field(s)
  • Telecommunications
  • Television (Radioelectricity)
  • Radio Transmission and Reception
DEF

The phase difference between two adjacent frequencies.

OBS

Two paremeters +x degree and-y degree which represent the maximum(peak) differences in phase between the sub-carrier on the treads of the received test signal and the sub-carrier on its blanking level, expressed in degrees difference from the latter. In the case of a monotonic characteristic either x or y will be zero. Band 8.

OBS

In a television system tested with a low-level, high-frequency sine-wave signal (f1) superimposed on a low-frequency, sine-wave signal (f2), the difference in phase shift of f1 throughout the system for two specified levels of f2.

OBS

differential phase: standardized by IEEE.

French

Domaine(s)
  • Télécommunications
  • Télévision (Radioélectricité)
  • Émission et réception radio

Spanish

Campo(s) temático(s)
  • Telecomunicaciones
  • Televisión (Radioelectricidad)
  • Radiotransmisión y radiorrecepción
DEF

Desfase entre dos frecuencias adyacentes.

OBS

Dos parámetros de grado "+x" y "-y" que representan las diferencias máximas de fase entre la subportadora en las huellas de la señal de prueba recibida y la subportadora en su nivel de supresión, expresados en diferencia de grados con relación a la posterior. En caso de una característica monotónica, "x" o "y" serán cero.

Save record 6

Record 7 2000-04-04

English

Subject field(s)
  • Small Arms
DEF

Cartridge case design having a raised band ahead of the extractor groove. A design generally used on large capacity magnum type cartridges and which serves to reinforce the head of the case. To date, its only military application is with cannon ammunition, e. g. 20 x 113 mm B ADEN. See also "metric cartridge designation".

French

Domaine(s)
  • Armes légères
DEF

Type de douille ayant une nervure devant la gorge d'extraction. Cette configuration est utilisée d'habitude sur les cartouches surpuissantes de type magnum et a pour but de renforcer le culot de la douille. Présentement, sa seule application militaire est avec les munitions de canons, e.g. 20 x 113 mm B ADEN. Voir aussi «appellation métrique des cartouches».

OBS

douille ceinturée : terme et définition uniformisés par le Groupe de travail de terminologie des armes légères.

Spanish

Save record 7

Record 8 1991-11-12

English

Subject field(s)
  • Statistics
OBS

"... and where g is a symmetric k x k band matrix of bandwidth 3 and... "(Article by D. R. Bellhouse for Symposium ’89).

French

Domaine(s)
  • Statistique
OBS

"(...) et où G est une matrice bande symétrique k x k de largeur de bande 3 (...)" (D.R. Bellhouse, Symposium 1989, section 3.2; référence 2721697).

OBS

"Dictionnaire de mathématique" (en 4 langues), Elsevier.

Spanish

Save record 8

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