INVERSION OF SYNTHETIC APERTUR,E R,ADAR (SAR) - MSpace ...

Azimuth
Ground
Range
Figule 3.10: Geouretly fol a sensol' ancl scatter cooldinate.
with lespect to ¿, (thild step in Figure 3.9) after.rnatched filteling r.esults ir
â, raùge compl'essed signal given as
s(c,r;4): ó (' - ?oA,A)
*p{-;fq',r¡}
(3.4e)
A key approxirnation used in conventional approaches is a quadratic approximation
of ralge .R(2, ry) to be
R(x'tfl : ,F+n'
= ,t + (3.50)
*. ptt
Using this cluaclratic approxitration, the range cornpr.essed signal is then
ap1>r'oxirnatecl to
/ z ¡2\ ( .+n. ¿2 ì
s(r,r;4) a 6 (¿ - ;, -;)*r, {-,}(r
*
il}
(r 5r)
Conventional apploaches pelform the lange migr.ation correctiol and the
azimuth complession in the rarrge-Doppler domain based on Eq.(3.b1) (Wu
59