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HF PROPAGATION [2 records]
Record 1 - internal organization data 2004-01-19
Record 1, English
Record 1, Subject field(s)
- Telecommunications Transmission
Record 1, Main entry term, English
- oblique ionospheric sounding
1, record 1, English, oblique%20ionospheric%20sounding
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, 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 1, English, - oblique%20ionospheric%20sounding
Record number: 1, 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 1, English, - oblique%20ionospheric%20sounding
Record 1, French
Record 1, Domaine(s)
- Transmission (Télécommunications)
Record 1, Main entry term, French
- sondage oblique
1, record 1, French, sondage%20oblique
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- sondage ionosphérique oblique 2, record 1, French, sondage%20ionosph%C3%A9rique%20oblique
proposal, masculine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 PHR
Station de réception par sondage oblique passif. 3, record 1, French, - sondage%20oblique
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 1993-02-28
Record 2, English
Record 2, Subject field(s)
- Various Proper Names
- Telecommunications
Record 2, Main entry term, English
- HF Propagation 1, record 2, English, HF%20Propagation
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record 2, French
Record 2, Domaine(s)
- Appellations diverses
- Télécommunications
Record 2, Main entry term, French
- Propagation HF 1, record 2, French, Propagation%20HF
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 OBS
Groupe de travail 6A du CCIR 1, record 2, French, - Propagation%20HF
Record number: 2, Textual support number: 2 OBS
Source : Liste du CCIR 1, record 2, French, - Propagation%20HF
Record 2, Spanish
Record 2, Textual support, Spanish
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