TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

MOVING SATELLITE [6 records]

Record 1 2022-10-04

English

Subject field(s)
  • Climatology
  • Meteorological Forecasting, Data Measurement and Analysis
CONT

Just as the radiosonde record has deficiencies, however, the satellite data also suffer from, among other things, limited vertical resolution, orbit drift, satellite platform changes, instrument drift, complications with calibration procedures, and the introduction of biases through modifications of processing algorithms. Other upper-air measurements have come from moving platforms such as aircraft. Observations from some high-mountain locations have also been considered part of the upper-air measurement system.

Key term(s)
  • upper air measurement

French

Domaine(s)
  • Climatologie
  • Prévisions météorologiques et mesure et analyse des données
CONT

Tout comme les séries de données de radiosondage, les séries de données de satellite présentent des défauts découlant de différents facteurs[ :] résolution verticale limitée, dérive d'orbite, modifications de la plate-forme satellitaire, dérive des instruments, complications engendrées par les procédures d'étalonnage et erreurs systématiques découlant des modifications apportées aux algorithmes de traitement. Des mesures en altitude peuvent aussi être obtenues à partir d'autres plates-formes mobiles, tels les aéronefs. On estime que les observations réalisées en certains lieux situés en haute montagne font également partie du système de mesure en altitude.

Spanish

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Record 2 2015-08-27

English

Subject field(s)
  • Satellite Telecommunications
  • Modernization of Military Equipment
CONT

Satcom on-the-move(SOTM), or satellite communications on-the-move, is a phrase used in the context of mobile satellite technology, specifically relating to military ground vehicles. The basic principle behind satcom on-the-move is that a vehicle equipped with a satellite antenna is able to establish communication with a satellite and maintain that communication while the vehicle is moving.

French

Domaine(s)
  • Télécommunications par satellite
  • Modernisation du matériel militaire

Spanish

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Record 3 2006-06-15

English

Subject field(s)
  • Satellite Telecommunications
  • Telecommunications Facilities
  • Radio Transmission and Reception
CONT

... a stationary satellite permits the use of fixed(nonmovable) antennas on the Earth because they do not have to track a moving satellite.

French

Domaine(s)
  • Télécommunications par satellite
  • Installations de télécommunications
  • Émission et réception radio
CONT

[les satellites Intelsat] auront [...] des antennes fixes fonctionnant à 4-6 GHz et aux nouvelles fréquences de 11-14 GHz, avec des faisceaux très directifs.

Spanish

Campo(s) temático(s)
  • Telecomunicaciones por satélite
  • Instalaciones de telecomunicaciones
  • Radiotransmisión y radiorrecepción
Save record 3

Record 4 2004-03-26

English

Subject field(s)
  • Spacecraft
CONT

The Centre National d’Etudes Spatiales, CNES(French Space Agency) took a spectacular picture of the European ERS-1 satellite via SPOT 4, the most recent optical observation satellite in the SPOT family, which was launched on 24 March 1998.... From its orbit at an altitude of 820 km, SPOT 4 is able to pick out details of 10 metres on the Earth's surface, which is moving at a speed of 24, 000 km per hour. The ERS-1 orbit is 41 km below that of SPOT, which means that the latter can distinguish details of 50 cm in size on ERS-1. However, since ERS-1 flies much lower it flies faster than SPOT 4 and overtakes it with a relative velocity of about 250 km/h.

French

Domaine(s)
  • Engins spatiaux
CONT

Le Centre National d'Études Spatiales (CNES) a réalisé une prise de vue spectaculaire du satellite européen ERS-1 grâce à SPOT 4, le plus récent satellite d'observation optique de la famille SPOT, lancé le 24 mars 1998. [...] Depuis son orbite à 820 km d'altitude, SPOT 4 est conçu pour distinguer des détails de 10 mètres sur des paysages terrestres qui défilent à 24 000 km/h. ERS-1 parcourt une orbite qui passe 41 km sous celle de SPOT; cette proximité permet à SPOT 4 de distinguer sur ERS-1 des détails de 50 cm. En revanche, volant plus bas, ERS-1 est plus rapide et double SPOT 4 à la vitesse relative d'environ 250 km/h.

PHR

Satellite d'observation optique visible et infrarouge.

Spanish

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Record 5 2003-10-23

English

Subject field(s)
  • Aerodynamics and Theory of Gases
  • Air Forces
  • Weapon Systems
DEF

The drag exerted by air particles upon a moving object, as upon an aircraft or rocket moving through the air, or upon an earth satellite that comes within the earth's atmosphere during orbit.

French

Domaine(s)
  • Théorie des gaz et aérodynamique
  • Forces aériennes
  • Systèmes d'armes
DEF

Force de traînée exercée par les particules d'air sur un objet en mouvement tel qu'un aéronef ou un missile se déplaçant dans l'air, ou sur un satellite de la Terre qui rentre dans l'atmosphère terrestre au cours de son orbite.

Spanish

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Record 6 2001-06-21

English

Subject field(s)
  • General Mechanics (Physics)
  • Aircraft Piloting and Navigation
  • Navigation Instruments
  • Flight Instruments and Equipment (Aeroindustry)
CONT

The attitude of a satellite is its position in space-its orientation... To stabilize a satellite, the satellite must have a system that keeps it moving evenly through its orbit. Satellites often use a spinning or gyroscopic motion to keep them stable.

CONT

A gyroscope will not only resist being moved out of its vertical position, it will also generate force as it attempts to travel in large, circular patterns. These patterns are most easily seen with a spinning top. As the top begins losing its energy, it never simply spirals straight down in the same direction that it was originally spinning. As it destabilizes, it will always begin slowly rotating or precessing in a slow, even circle that is in the opposite direction to its normal spinning motion. These circular patterns are known as "precessional" motions, and they are another aspect of a gyroscope’s movement that will occur either in air or in a vacuum and can be used to overcome gravity.

French

Domaine(s)
  • Mécanique générale (Physique)
  • Pilotage et navigation aérienne
  • Instruments de navigation
  • Instruments et équipement de bord (Constructions aéronautiques)
CONT

Les protons ont une charge électrique positive, que l'on peut considérer grossièrement comme mise en mouvement par le mouvement gyroscopique (ou spin) de cette particule.

Key term(s)
  • mouvement précessionnel

Spanish

Save record 6

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