TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

Raytheon's IMS [Integrated Maritime Surveillance] uses land-based long-range surface wave radar, which transmits high frequency(HF) radio waves that follow the earth's curvature. The SWR-503 Surface Wave Radar detects and tracks aircraft, surface vessels and icebergs out to 500 km from the shore in a sector of up to 120 degrees. The radar also provides current and surface wind data. At an Operations Control Centre, the IMS system correlates detections from surface wave radar sites with identification information from ADS systems and other sensors. All of this data is fused to create a database and display system providing a complete picture of surface and air activity in the EEZ. Vessel tracks can be run backward and forward in time, enhancing military patrols and coast guard search-and-rescue efforts as well as oil spill control, drug interdiction, and iceberg alerts. Applications for HF Surface Wave Radar are being developed in fields such as Theatre Ballistic Missile and Meteor Shower Detection.  5, record 1, English, - high%2Dfrequency%20surface%20wave%20radar

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

Un radar haute fréquence à ondes de surface (RHFOS) ultraperfectionné que Raytheon Canada Limited (RCL) a conçu afin de détecter la présence de petits navires et d'aéronefs volant à basse altitude a été présenté avec succès à la Drug Enforcement Agency des États-Unis.  2, record 1, French, - radar%20haute%20fr%C3%A9quence%20%C3%A0%20ondes%20de%20surface

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 CONT

The behaviour of the ionosphere and HF [High Frequency] wave propagation parameters and their possible changes can be described using ionospheric oblique sounding (IOS) data. With the help of this method the maximum observed frequency (MOF), the maximum useable frequency (MUF), the lowest observed frequency (LOF), the number of propagation modes and the signal delays can be determined.  2, record 2, English, - oblique%20ionospheric%20sounding

Record number: 2, Textual support number: 1 OBS

The changing state of the ionosphere is generally monitored by networks of vertical ionosondes. These radars transmit and receive HF(1-30MHz) radio waves to and from the ionosphere directly above the monitoring station. The result is real-time information on the state of the ionosphere needed by communications users allowing them to adapt their operational systems accordingly. The oblique ionospheric sounder extends this idea. The transmitter and receiver of the oblique sounder are not co-located like the vertical but are generally hundreds thousands of kilometres apart. So the instrument is able to study how the radio signals of real communications(below 30MHz) propagate via the ionosphere under a variety of conditions. However the interpretation of the oblique propagation is also significantly harder than the case of the vertical.  3, record 2, English, - oblique%20ionospheric%20sounding

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 PHR

Station de réception par sondage oblique passif.  3, record 2, French, - sondage%20oblique

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 OBS

Groupe de travail 9E du CCIR  1, record 3, French, - Syst%C3%A8mes%20HF

Record number: 3, Textual support number: 2 OBS

Source : Liste du CCIR  1, record 3, French, - Syst%C3%A8mes%20HF

Record 3,  Textual support,  Spanish