Editing Imaging radar (section)

===Real aperture radar===

'''Real aperture radar''' ('''RAR''') is a form of radar that transmits a narrow angle beam of pulse radio wave in the range direction at right angles to the flight direction and receives the backscattering from the targets which will be transformed to a radar image from the received signals.

Usually the reflected pulse will be arranged in the order of return time from the targets, which corresponds to the range direction scanning.

The resolution in the range direction depends on the pulse width.  The resolution in the azimuth direction is identical to the multiplication of beam width and the distance to a target.<ref>{{Cite web|title = 4.2 Real Aperture Radar|url = http://wtlab.iis.u-tokyo.ac.jp/~wataru/lecture/rsgis/rsnote/cp4/cp4-2.htm|website = wtlab.iis.u-tokyo.ac.jp|access-date = 2015-11-12|archive-date = 2015-10-23|archive-url = https://web.archive.org/web/20151023152350/http://wtlab.iis.u-tokyo.ac.jp/~wataru/lecture/rsgis/rsnote/cp4/cp4-2.htm|url-status = dead}}</ref>

====AVTIS radar====
The AVTIS radar is a 94&nbsp;GHz real aperture 3D imaging radar.  It uses Frequency-Modulated Continuous-Wave modulation and employs a mechanically scanned monostatic with sub-metre range resolution.<ref>{{Cite book|last = David G|first = Macfarlane| title=2006 European Radar Conference | chapter=A 94GHz real aperture 3D imaging radar |date = 2006|doi = 10.1109/EURAD.2006.280297|pages = 154–157|isbn = 2-9600551-7-9|s2cid = 30522638}}</ref>