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VLBI [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2009-05-07

English

Subject field(s)
  • Satellite Telecommunications
DEF

Technique using correlated observations of celestial or satellite radio sources by ground stations hundreds or thousands of kilometers apart for determining the precise position and movements of the sources or of the ground stations.

OBS

Reproduced from "Titles, Names and Acronyms related to the activities of the International Oceanographic Commission of Unesco", with the authorization of Unesco.

French

Domaine(s)
  • Télécommunications par satellite
DEF

Interférométrie d'ondes électromagnétiques, qui utilise une base déterminée par deux récepteurs distants d'au moins plusieurs milliers de kilomètres.

OBS

Deux récepteurs placés sur des satellites en orbite ou sur des stations spatiales permettent d'obtenir des bases d'une longueur très supérieure au diamètre de la Terre et d'augmenter le pouvoir de résolution pour les observations astronomiques.

OBS

Reproduit de "Titles, Names and Acronyms related to the activities of the International Oceanographic Commission of Unesco", avec l'autorisation de l'Unesco.

Spanish

Campo(s) temático(s)
  • Telecomunicaciones por satélite
OBS

Reproducido del "Titles, Names and Acronyms related to the activities of the International Oceanographic Commission of Unesco", con la autorización de Unesco.

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Record 2 2003-03-12

English

Subject field(s)
  • Range Measurements (Telecommunications)
  • Practical Astronomy
CONT

Determining the Earth's motion with reference to distant astronomical bodies (quasars) is principally achieved through Very Large Base Interferometry (VLBI) techniques based on simultaneous observation of quasi-stellar sources by an international network of radioastronomy observatories. ... Obviously, the motions of the Earth's interior cannot be measured directly and must be deduced from the analysis of surface deformations combined with high-precision space-based measurements of the Earth's gravity and magnetic fields.

French

Domaine(s)
  • Mesures à distance (Télécommunications)
  • Astronomie pratique
CONT

L'IERS [Service International de la Rotation Terrestre], créé en 1988, a pour principaux objectifs la rotation terrestre et la maintenance des systèmes de référence terrestre et céleste associés à partir de programmes permanents d'observation de précision centimétrique : radiointerférométrie à longue base (VLBI), télémétrie par laser sur la Lune et sur satellites artificiels (LLR, SLR), Global Positioning System (GPS), ainsi que le programme DORIS du CNES [Centre National d'Études Spatiales].

Spanish

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