Discussion
What is 'SAR' in remote sensing, a technology for producing fine-resolution images from a resolution limited radar system?
Answer: B
SAR stands for Synthetic Aperture Radar.
A radar's resolution depends on the size of its antenna (aperture). SAR uses the motion of the aircraft or satellite to combine echoes received along the flight path, synthesising the effect of a very long antenna and so producing fine-resolution images, day or night and through cloud.
The other expansions change 'aperture', the key word that explains the technique, and are not used terms.
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