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X BAND RADAR [4 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

Save record 1

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

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