sar_summary
SAR基本介绍
Azimuth Resolution (top view)
a
L
r
l--
-length of radar antennanominal slant range H/cosq
wavelength of radar
sinqr=l/L - diffration resolution
rllH= - half-length of ground illuminationLLcosqForm a synthetic aperture that has a length of 2Ra. The improved azimuth resolution isRa=rsinqr='Ra=lrL = - theoretical resolution of strip-mode SAR 2Ra2
Note the azimuth resolution is independent of spacecraft height and improves as theantenna length is reduced. One could form a longer synthetic aperture by steering thetransmitted radar beam so it follows the target as the spacecraft (aircraft) flies by. This is
called spotlight-mode SAR.
