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AMBIGUITE AZIMUTALE [1 record]
Record 1 - internal organization data 2011-01-27
Record 1, English
Record 1, Subject field(s)
- Radar, Radio Guidance and Goniometry
- Spacecraft
- Remote Sensing
Record 1, Main entry term, English
- azimuth ambiguity
1, record 1, English, azimuth%20ambiguity
correct, officially approved
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
A type of ghosting that occurs when the distance between the sensor and the imaged area is not well known or when the surface is very uneven. 2, record 1, English, - azimuth%20ambiguity
Record number: 1, Textual support number: 1 CONT
Once the SAR wavelength and orbital altitude have been specified, the antenna has to meet a certain minimum aperture area dictated by range and azimuth ambiguity considerations. The challenge is to develop clever sub-pulse coding schemes that make it possible to suppress the ambiguities, thereby reducing the requirements on antenna size by a factor of 5 or 10. 3, record 1, English, - azimuth%20ambiguity
Record number: 1, Textual support number: 1 OBS
Ghosting occurs when the sampling of returned signals is too slow. 4, record 1, English, - azimuth%20ambiguity
Record number: 1, Textual support number: 2 OBS
azimuth ambiguity: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG). 4, record 1, English, - azimuth%20ambiguity
Record 1, French
Record 1, Domaine(s)
- Radar, radioguidage et radiogoniométrie
- Engins spatiaux
- Télédétection
Record 1, Main entry term, French
- ambiguïté en azimut
1, record 1, French, ambigu%C3%AFt%C3%A9%20en%20azimut
correct, feminine noun, officially approved
Record 1, Abbreviations, French
Record 1, Synonyms, French
- ambiguïté azimutale 2, record 1, French, ambigu%C3%AFt%C3%A9%20azimutale
correct, feminine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
Ambiguïté en azimut. Si l'image générée est bidimensionnelle, l'information reçue est quant à elle unidimensionnelle. L'antenne ne fait que stocker une succession d'échos en fonction du temps bien qu'ils soient stockés dans une matrice bidimensionnelle. Seule une connaissance approchée et a priori de la distance de la zone à imager permet de calibrer les délais d'acquisition et d'assigner la bonne position en azimut pour une ligne. Si celle-ci est mal connue, le lieu imagé ne sera pas celui attendu. Mais surtout, le lobe principal «éclairant» tout de même la zone étudiée, des échos risquent de revenir plus tôt ou plus tard et donc, pendant une autre phase d'acquisition. Ils seront [alors] associés à une autre ligne, c'est-à-dire à une autre position azimutale. 3, record 1, French, - ambigu%C3%AFt%C3%A9%20en%20azimut
Record number: 1, Textual support number: 1 OBS
ambiguïté en azimut : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR) et par le Comité d'uniformisation de la terminologie spatiale (CUTS). 4, record 1, French, - ambigu%C3%AFt%C3%A9%20en%20azimut
Record 1, Spanish
Record 1, Campo(s) temático(s)
- Guía radárica, radioguía y radiogoniometría
- Naves espaciales
- Teledetección
Record 1, Main entry term, Spanish
- ambigüedad en acimut
1, record 1, Spanish, ambig%C3%BCedad%20en%20acimut
correct, feminine noun
Record 1, Abbreviations, Spanish
Record 1, Synonyms, Spanish
Record 1, Textual support, Spanish
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