Precision SAR Processing Using Chirp Scaling

  Abstract-A space-variant interpolation is required to com- 3)F|*F3R  
pensate for the migration of signal energy through range res- ?zeJ#i  
olution cells when processing synthetic aperture radar (SAR) 2QD3&Q9  
data, using either the classical range/Doppler (RlD) algorithm ~k\fhx  
or related frequency domain techniques. In general, interpo- H35S#+KX  
lation requires significant computation time, and leads to loss 00G%gQXk,  
of加age quality, especially in the complex image. The new ch帅 D N'3QQn  
scaling algorithm avoids interpolation, yet performs range cell ?^H `M|S  
migration correction accurately. The algorithm requires only dU6ou'pf  
complex multiplies and Fourier transforms to implement, is in- @XgKYm   
herently phase preserving, and is suitable for wide-swath, large- YNLV9.P6  
besmwidth, and large-squint applications. This paper de- 33o9Yg|J~  
scribes the chirp scalieg algorithm, summarizes simulation re- I(]}XZq  
salts, presents imagery processed with the algorithm, and re- TlXI|3Ip  
views quantitative measures of its performance. Based on x^HGVWw_  
quantitative comparison, the chirp scaling algorithm provides !Z`j2 e}  
image quality equal to or better than the precision range/ C\3y
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Doppler processor. lh}er the r .. r;/4F/6"  
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