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Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

A tall metallic structure used as a support for one or more microwave antennas. The associated transmitter and receiver microwave equipment and their power supplies are housed in bays inside a small building located near the tower.  3, record 1, English, - microwave%20tower

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 DEF

Structure métallique verticale, qui permet de supporter des antennes de faisceaux hertziens, constituée généralement de pièces tubulaires assemblées entre elles par des boulons à haute résistance.  4, record 1, French, - tour%20hertzienne

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

In communications, a direct propagation path that does not go below the radio horizon.  2, record 2, English, - line%20of%20sight

Record number: 2, Textual support number: 1 OBS

Characteristic of some open-air transmission technologies where the area between a transmitter and a receiver must be clear and unobstructed. Said of microwave, infrared, and open-air, laser-type transmissions.  3, record 2, English, - line%20of%20sight

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

État d'une onde radioélectrique qui se propage entre les antennes d'émission et de réception sur un rayon rectiligne.  1, record 2, French, - visibilit%C3%A9%20directe

Record number: 2, Textual support number: 1 OBS

en visibilité directe : locution servant à qualifier les moyens qui fonctionnent avec de telles ondes.  1, record 2, French, - visibilit%C3%A9%20directe

Record 2,  Textual support,  Spanish

Record number: 2, Textual support number: 1 OBS

Característica de algunas técnicas de transmisión en el espacio libre que requieren una ruta despejada entre el transmisor y el receptor, como en transmisiones por microondas, enlaces ópticos o por infrarrojos.  1, record 2, Spanish, - con%20visibilidad%20directa

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

A fixed-frequency transmitter tube used to produce high energy microwave pulses. Electrons emitted from the cathode gyrate under the influence of a strong magnetic field before reaching the anode. The output is fed to an antenna through a waveguide network.  1, record 3, English, - magnetron

Record number: 3, Textual support number: 1 OBS

magnetron: term and first definition standardized by the International Electrotechnical Commission.  1, record 3, English, - magnetron

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 OBS

Terme et définition normalisés par la CEI.  1, record 3, French, - magn%C3%A9tron

Record number: 3, Textual support number: 2 OBS

Il s'agit d'une diode à vide entourée d'un puissant aimant permanent. La cathode, au centre, émet des électrons qui sont attirés vers une anode concentrique lorsque cette dernière est portée à un potentiel positif. Or le champ magnétique fait dévier les électrons dont la trajectoire prend la forme d'une spirale... ce qui donne lieu à des oscillations. Aussi l'anode contient des cavités résonantes qui entretiennent les oscillations dans la bande des hyperfréquences. L'énergie qui en résulte, pouvant atteindre plusieurs mégawatts, est acheminée vers l'antenne à l'aide d'un réseau de guides d'ondes. On utilise des magnétrons dans les radars et les relais hertziens.  1, record 3, French, - magn%C3%A9tron

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 DEF

An instrument combining a pulsed laser transmitter and optical receiver(usually a telescope) with an electronic signal processing unit used for the detection and ranging of various distant targets in the atmosphere, analogous to the principles of operation of microwave radar.  6, record 4, English, - lidar

Record number: 4, Textual support number: 1 CONT

The lidar technique operates on the same principle as radar; in fact, it is sometimes called laser radar. The principal difference between lidar and radar is the wavelength of the radiation used. Radar uses wavelengths in the radio band whereas lidar uses light, that is usually generated by lasers in modern lidar systems.  7, record 4, English, - lidar

Record number: 4, Textual support number: 2 CONT

There are three basic generic types of lidar: range finders, DIAL, and Doppler lidars. Rande finder lidars are the simplest lidars. They are used to measure the distance from the lidar instrument to a solid or hard target Differential Absorption Lidar (DIAL) is used to measure chemical concentrations (such as ozone, water vapor, pollutants) in the atmosphere. Doppler lidar is used to measure the velocity of a target High-resolution DEMs with vertical accuracy as good as 10 cm can be created with Lidar. Lidar is also better able to map bare earth elevations in forested or vegetated areas than other methods because only a single laser pulse needs to be able to reach between trees and the ground.  8, record 4, English, - lidar

Record number: 4, Textual support number: 1 OBS

lidar: Coined word for light detection and ranging.  6, record 4, English, - lidar

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 DEF

Combinaison d'un laser et d'un récepteur accolés, destinée à étudier les échos produits par les particules de l'atmosphère sur des ondes visibles ou infrarouges.  5, record 4, French, - lidar

Record number: 4, Textual support number: 1 OBS

La détection se fait par des cellules optiques suivies de photomultiplicateurs.  6, record 4, French, - lidar

Record number: 4, Textual support number: 2 OBS

Le lidar sert également à la localisation et à la poursuite télémétrique d'engins dans le ciel.  7, record 4, French, - lidar

Record number: 4, Textual support number: 3 OBS

lidar : acronyme dérivé du terme anglais «light detection and ranging» qui veut dire «détection et télémétrie par ondes lumineuses».  8, record 4, French, - lidar

Record 4,  Textual support,  Spanish

Record number: 4, Textual support number: 1 DEF

Aparato de detección y localización por ondas luminosas.  1, record 4, Spanish, - lidar

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 CONT

A satellite is a wireless receiver/transmitter that operates in orbit around the earth and acts as a microwave relay station, receiving signals sent from a ground-based station, amplifying them, and retransmitting them on a different frequency to another groundbased station.  1, record 5, English, - microwave%20relay%20station

Record number: 5, Textual support number: 1 OBS

radio relay; RR: term and abbreviation officially approved by the Department of National Defence and the Canadian Forces.  8, record 5, English, - microwave%20relay%20station

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 DEF

Station réémettrice assurant le relayage d'un faisceau hertzien lorsque l'antenne de réception n'est pas en visibilité directe de l'antenne d'émission.  1, record 5, French, - relais%20hertzien

Record number: 5, Textual support number: 1 OBS

Dans le cas le plus fréquent d'un relais hertzien au sol, celui-ci comprend essentiellement un pylône ou une tour portant deux ou plusieurs antennes paraboliques et abritant les appareils de réception et réémission des signaux.  1, record 5, French, - relais%20hertzien

Record number: 5, Textual support number: 2 OBS

Peut être constitué par un satellite de télécommunications.  1, record 5, French, - relais%20hertzien

Record 5,  Textual support,  Spanish

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 CONT

The three onboard microwave scan beam landing systems are airborne Ku-band receiver/transmitter navigation and landing aids with decoding and computational capabilities. The MSBLS [Microwave Scan Beam Landing System] units determine slant range, azimuth and elevation to the ground stations alongside the landing runway. MSBLS is used during terminal area energy management, the approach and landing flight phases and return-to-launch-site aborts.  2, record 6, English, - terminal%20area%20energy%20management

Record 6,  Textual support,  French

Record 6,  Textual support,  Spanish

Record 7,  Textual support,  English

Record number: 7, Textual support number: 1 CONT

Invisible barrier detectors generate an invisible beam of energy and are intended to detec intruders running, walking, or crawling through the beam. The barrier is formed by a transmitter emitting a beam of either microwave or infrared energy. A corresponding receiver, located in the line of sight of the transmitter at the opposite end of the beam, receives and monitors the transmitted signal for changes characteristics of someone penetrating the beam.  1, record 7, English, - invisible%20barrier%20detector

Record 7,  Textual support,  French

Record 7,  Textual support,  Spanish

Record 8,  Textual support,  English

Record number: 8, Textual support number: 1 CONT

The laser(or lidar) velocimeter [lidar=light radar] operates in a fashion entirely analogous to that of the airborne Doppler weather radars likely soon to be available for detecting turbulence in storm cells. As with radars, the device detects air movements by observing the motion of particles suspended in the air and carried with it. The only significant difference is that a beam of coherent infrared radiation is used to scan ahead of the aircraft, instead of a beam(or series of pulses) of radio energy in the considerably longer-wavelength microwave band. The frequency of the back-scattered echoes or reflections undergoes Doppler shift detection by standard heterodyning techniques, which involve comparing the frequency of the reflected illumination with that of the original laser beam. Any reflecting object or material which has motion relative to the transmitter/receiver will cause a detectable shift in frequency, which can be isolated from the transmitter's own proper motion(over the ground) and thus yield a precise indication of the speed at which the air is moving several hundred metres in front of the aircraft. From this data, it is easy to compute what the air speed of the aircraft will be when it reaches that particular patch of air in a few seconds’ time [and hence detect possible turbulence ahead].  2, record 8, English, - laser%20velocimeter

Record 8,  Textual support,  French

Record number: 8, Textual support number: 1 CONT

Le principe de fonctionnement du vélocimètre à laser (ou lidar) est exactement le même que celui des radars météorologiques Doppler de bord, qui doivent être mis en service prochainement pour la détection des turbulences dans les systèmes d'orages.  1, record 8, French, - v%C3%A9locim%C3%A8tre%20%C3%A0%20laser

Record 8,  Textual support,  Spanish

Record 9,  Textual support,  English

Record number: 9, Textual support number: 1 CONT

Primary radar is(...) the original form of radio-detection, in which a beam of microwave energy illuminates a passive or "non-cooperating" target and the reflected pulse or echo is processed to display its bearing and distance from the transmitter(three-dimensional or height-finder radars will also display its altitude, although these are, so far, restricted to military surveillance applications, essentially for reasons of cost, plus the fact that there are alternative means of determining the altitude of aircraft, other than hostile intruders).  1, record 9, English, - passive%20target

Record 9,  Textual support,  French

Record number: 9, Textual support number: 1 CONT

Le radar primaire, c'est (...) la forme originale de la détection électromagnétique: un faisceau de micro-ondes est envoyé sur une cible passive et le signal réfléchi par celle-ci est traité pour en déterminer et faire apparaître sur un écran le relèvement et distance par rapport à l'émetteur (les radars tridimensionnels indiquent en outre l'altitude de la cible mais, essentiellement pour des raisons de coût et parce qu'il est possible de déterminer l'altitude des aéronefs amis par d'autres moyens, leurs applications sont actuellement limitées à la surveillance militaire).  1, record 9, French, - cible%20passive

Record 9,  Textual support,  Spanish