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electronic navigational shadow sectors

French translation: secteurs masqués des appareils électroniques de navigation

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:electronic navigational shadow sectors
French translation:secteurs masqués des appareils électroniques de navigation
Entered by: philippe vandevivere

12:24 Jul 26, 2014
English to French translations [PRO]
Tech/Engineering - Ships, Sailing, Maritime / radar
English term or phrase: electronic navigational shadow sectors
Il s'agit d'une procédure d'utilisation du positionnement dynamique sur navires ravitailleurs de plateformes pétrolières :

Suggested factors for consideration when performing a Risk Assessment:
• ...
• Relative size of DP VESSEL and the offshore installation;
• Nature of the supply operation;
• ...
• Proximity of other obstructions in the immediate area;
• Possibility of electronic navigational shadow sectors when close to installations;
philippe vandevivere
France
Local time: 18:17
secteurs masqués des appareils électroniques de navigation
Explanation:
Par exemple le secteur de balayage de l’antenne radar masqué par une obstruction.

http://www.seasources.net/Radar_Terms.htm :
Shadow sector : A sector on the radarscope in which the appearance of radar echoes is improbable because of an obstruction near the antenna. While both blind and shadow sectors have the same basic cause, bind sectors generally occur at the larger angles subtended the obstruction.

https://mcanet.mcga.gov.uk/public/c4/regulations/safetyofnav... RADARS
(See also SOLAS V/19.2.3.2 and 2.7.1)

8.1) Siting of the antenna unit

8.1.1) Siting of a radar antenna needs careful consideration so that a suitable compromise is reached which takes into consideration the effect of height on range performance and sea clutter, physical integrity and the need to minimise shadow sectors and false echoes through reflection.
Selected response from:

Antoine Dequidt
France
Local time: 18:17
Grading comment
merci !
4 KudoZ points were awarded for this answer



Summary of answers provided
4zones d'ombre par rapport aux systèmes électroniques de navigation
Daryo
4 -1zones non couvertes par le GPS
Pierre POUSSIN
3zones à l'ombre de ...
Leman (X)
4 -1secteurs masqués des appareils électroniques de navigation
Antoine Dequidt


  

Answers


50 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): -1
zones non couvertes par le GPS


Explanation:
Comme pour la couverture en téléphonie...

Pierre POUSSIN
France
Local time: 18:17
Works in field
Native speaker of: Native in FrenchFrench
PRO pts in category: 40

Peer comments on this answer (and responses from the answerer)
disagree  Daryo: BEFORE GPS was even at the stage of a crazy sounding new idea there was a number of navigational systems (like radars ...) many still in use.
4 hrs
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17 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5
zones à l'ombre de ...


Explanation:
Je suppose qu'on parle de zones où il est difficile ou impossible de capter un signal de positionnement?

--------------------------------------------------
Note added at 2 hrs (2014-07-26 14:43:30 GMT)
--------------------------------------------------

'hors' étant synonyme de 'à l'ombre', mais moins nuancé

Leman (X)
Morocco
Local time: 17:17
Native speaker of: Native in FrenchFrench, Native in EnglishEnglish

Peer comments on this answer (and responses from the answerer)
disagree  Antoine Dequidt: S’il s’agissait de zones le terme en anglais serait "areas". Le texte source fait mention de la proximité d’installations : "close to installations"
3 hrs
agree  Daryo: that's the basic idea
5 hrs
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3 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): -1
secteurs masqués des appareils électroniques de navigation


Explanation:
Par exemple le secteur de balayage de l’antenne radar masqué par une obstruction.

http://www.seasources.net/Radar_Terms.htm :
Shadow sector : A sector on the radarscope in which the appearance of radar echoes is improbable because of an obstruction near the antenna. While both blind and shadow sectors have the same basic cause, bind sectors generally occur at the larger angles subtended the obstruction.

https://mcanet.mcga.gov.uk/public/c4/regulations/safetyofnav... RADARS
(See also SOLAS V/19.2.3.2 and 2.7.1)

8.1) Siting of the antenna unit

8.1.1) Siting of a radar antenna needs careful consideration so that a suitable compromise is reached which takes into consideration the effect of height on range performance and sea clutter, physical integrity and the need to minimise shadow sectors and false echoes through reflection.



    Reference: http://www.seasources.net/Radar_Terms.htm
    https://mcanet.mcga.gov.uk/public/c4/regulations/safetyofnavigation/annexes/Annex20.htm
Antoine Dequidt
France
Local time: 18:17
Specializes in field
Native speaker of: Native in FrenchFrench
PRO pts in category: 86
Grading comment
merci !

Peer comments on this answer (and responses from the answerer)
disagree  Daryo: close but not quite that; in this ST the "shadow" is behind the oil rig, when the oil rig is between the ship and some source of navigational signals.
2 hrs
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5 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5
zones d'ombre par rapport aux systèmes électroniques de navigation


Explanation:
Possibility of electronic navigational shadow sectors when close to installations;
=>
here it's a negative/unwanted possibility i.e. a risk
=
risque [pour le navire] de se retrouver dans une zone d'ombre par rapport aux systèmes électroniques de navigation

this is most likely about radio beacons used in maritime navigation - when a ship gets close to a huge metal structure like an oil rig, it can find itself in the shadow of a beam emitted by a radio beacon (i.e. in a zone where the signal is obstructed by the oil rig).

This would renders this navigational system useless, as at least two signals from two radio beacons are needed to get a positional fix by triangulation; if the ship is the "shadow" of one radio beacon, the other one on its own is useless.

"Radio beacons
A radio beacon is a transmitter at a known location, which transmits a continuous or periodic radio signal with limited information content (for example its identification or location), on a specified radio frequency. Occasionally the beacon function is combined with some other transmission, like telemetry data or meteorological information.
Radio beacons have many applications, including air and sea navigation, propagation research, robotic mapping, radio frequency identification (radio-frequency identification, RFID) and indoor guidance as with real time locating systems (RTLS) like Syledis."
[http://en.wikipedia.org/wiki/Electric_beacon]

--------------------------------------------------
Note added at 6 hrs (2014-07-26 18:27:13 GMT)
--------------------------------------------------


http://www.epandi.com/ukpandi/infopool.nsf/html/LPBulletin61...

Daryo
United Kingdom
Local time: 17:17
Native speaker of: Native in SerbianSerbian, Native in FrenchFrench
PRO pts in category: 8
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