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interferometric synthetic aperture radar technique [1 record]

Record 1 2004-11-18

English

Subject field(s)
  • Radar, Radio Guidance and Goniometry
  • Spacecraft
  • Remote Sensing
CONT

The InSAR technique exploits the phase difference successive SAR observations and requires the information of an "interferogram" from two Single Look Complex (SLC) SAR images of the same scene acquired at different time.

CONT

Using the INSAR technique, it is possible to produce directly from SAR image data, detailed and accurate three-dimensional height maps of the Earth's surface topography. In addition, an extension of the basic technique, known as Differential INSAR (DINSAR), allows the detection of very small (centimetre-scale) motion of the land surface within an image. Furthermore, INSAR is emerging as a powerful tool for the detection of changes of land surface through the use of phase coherence. These possibilities open up many new potential applications of space-borne SAR data in the areas of cartography, volcanology, geomorphology, ice/glacial motion and land surface classification.

OBS

interferometric synthetic aperture radar technique; InSAR technique: terms officially approved by the RADARSAT-2 TerminologyApproval Group (RTAG).

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie
  • Engins spatiaux
  • Télédétection
CONT

La technique d'interférométrie SAR (InSAR) [permet de traiter] deux images radar (satellitaires ou aéroportées) acquises soit de [deux] points de vue différents soit à des [moments] différents. [Cette technique repose sur] l'hypothèse fondamentale [...] que la contribution interne, liée aux propriétés physiques, géométriques et diélectriques des cibles, demeure stable entre les [...] prises de vue. Si cette hypothèse est vérifiée, alors l'interférogramme révèle des systèmes de franges liés à la topographie (sensibilité de quelques dizaines de mètres dépendant de l'écart orbital entre les prises de vue) ainsi qu'à la déformation de surface (précision de quelques mm).

OBS

technique d'interférométrie SAR; technique InSAR : termes uniformisés par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

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