New approach to strip-map SAR autofocus

Conference · Sun May 01 04:00:00 EDT 1994

OSTI ID:10147835

Wahl, D; Jakowatz, C; Thompson, P; Ghiglia, D

Means for removing phase errors induced in spotlight mode synthetic aperture radar (SAR) imagery are now well-established. The Phase Gradient Autofocus (PGA) algorithm has been shown to be robust over a wide range of spotlight mode imagery and phase error functions. These phase errors could have their origin either in uncompensated platform motion or random propagation delays incurred, for example, from tropospheric turbulence. The PGA technique, however, cannot be directly applied to imagery formed in the conventional strip-mapping mode. In this paper we show that if the fundamental ideas of PGA are modified in an appropriate way, the phase errors in strip-map imagery can be effectively estimated and compensated.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 10147835
• Report Number(s): SAND--94-1175C; CONF-941090--1; ON: DE94010808; BR: GB0103012
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420200
ALGORITHMS
ERRORS
FACILITIES, EQUIPMENT, AND TECHNIQUES
FOCUSING
IMAGE PROCESSING
PHASE SHIFT
SYNTHETIC-APERTURE RADAR