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How does synthetic aperture radar (SAR) work?

I know it has something to do with the pulse width. I need it in layman terms.

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The aparent size of a radar antenna can be increased by computer processing of multiple signals if the radar antenna is moving in a straight line. The sequence of returned signals are compared and the result can be made to look like the antenna is as wide (narrower aperture) as the flight path of the airplane involved. This reduced aperture is called Synthetic aperture. See here for a full description.