Abstract
The synthetic aperture is a signal processing technique that collects signal samples across a spatial volume and generates a huge database that helps solve a wide array of problems. For example, a synthetic aperture radar (SAR) synthesizes the motion of a long antenna by combining received signals as it moves along a flight track and provides data with finer spatial resolution that help create 2D images and the 3D reconstruction of objects. Recently, the synthetic aperture has also applied to wireless channel sounding and the over-the-air calibration of wireless devices <xref ref-type="bibr" rid="ref1" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[1]</xref> .
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