TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

Record number: 1, Textual support number: 1 CONT

Although great progress has been made using ground-based Doppler radars to study storm structure, remote storms such as oceanic cyclones and hurricanes cannot be observed with these systems. Also, some phenomena are remote, such as orographic storms over mountains or clouds over the arctic... Airborne meteorological radars provide a means to make measurements of the structure and dynamics of these difficult-to-observe weather systems.... meteorological radar systems are deployed on a number of research aircraft.  4, fiche 1, Anglais, - airborne%20weather%20radar

Fiche 1,  Justifications,  Français

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 CONT

Maritime Patrol Radar. The EL/M-2022A is an advanced, multimode maritime surveillance radar family, designed for fixed wing or rotary wing airborne platforms. The radar's main missions are maritime surveillance, sea traffic control and EEZ control. The radar's main features are : Long range surveillance [;] High resolution surveillance [;] Navigation and weather surveillance [;] Maritime Airborne Moving Targets Indication(MTI) [;] Wide Area Doppler Beam Sharpening(DBS) [;] Classification features [;] Multi-Target Track While Scan(TWS) [;] Imaging capabilities.  2, fiche 2, Anglais, - maritime%20patrol%20radar

Record number: 2, Textual support number: 1 PHR

Open Master airborne maritime patrol radar.  3, fiche 2, Anglais, - maritime%20patrol%20radar

Fiche 2,  Justifications,  Français

Record number: 2, Textual support number: 1 CONT

Les radars de patrouille maritime [...] (sont des) radars de détection et de poursuite de cibles maritimes [...] montés sur des avions ou des hélicoptères, dont la mission est de détecter [...] des cibles allant du navire de grandes dimensions au simple périscope de sous-marins [...]  1, fiche 2, Français, - radar%20de%20patrouille%20maritime

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

Record number: 3, 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, fiche 3, Anglais, - laser%20velocimeter

Fiche 3,  Justifications,  Français

Record number: 3, 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, fiche 3, Français, - v%C3%A9locim%C3%A8tre%20%C3%A0%20laser

Fiche 3,  Justifications,  Espagnol