Title :
New approach to strip-map SAR autofocus
Author :
Wahl, D.E. ; Jakowatz, C.V., Jr. ; Thompson, P.A. ; Ghiglia, D.C.
Author_Institution :
Sandia Nat. Labs., Albuquerque, NM, USA
Abstract :
This paper demonstrates how certain concepts from the Phase Gradient Autofocus (PGA) algorithm for automated refocus of spotlight mode SAR imagery may be used to design a similar algorithm that applies to SAR imagery formed in the conventional strip-mapping mode. The algorithm derivation begins with the traditional view of strip-map image formation as convolution (compression) using a linear FM chirp sequence. The appropriate analogies and modifications to the spotlight mode case are used to describe a working algorithm for strip-map autofocus
Keywords :
FM radar; convolution; data compression; frequency modulation; image coding; radar imaging; synthetic aperture radar; automated refocus; compression; convolution; linear FM chirp sequence; phase gradient autofocus algorithm; spotlight mode SAR imagery; strip-map SAR autofocus; strip-map image formation; strip-mapping mode; Algorithm design and analysis; Chirp; Convolution; Electronics packaging; Focusing; Image coding; Laboratories; Phase estimation; Robustness; Synthetic aperture radar;
Conference_Titel :
Digital Signal Processing Workshop, 1994., 1994 Sixth IEEE
Conference_Location :
Yosemite National Park, CA
Print_ISBN :
0-7803-1948-6
DOI :
10.1109/DSP.1994.379875
