Range dependent phase gradient autofocus

Author

THOMPSON, Douglas G. ; Bates, James S. ; Arnold, David V. ; Long, David G. ; Robertson, Adam

Author_Institution

Brigham Young Univ., Provo, UT, USA

Volume

5

fYear

1998

fDate

6-10 Jul 1998

Firstpage

2634

Abstract

The Phase Gradient Autofocus (PGA) algorithm has been widely used in spotlight synthetic aperture radar (SAR) to remove motion-induced blurs in the images. The PGA algorithm has been proven to be a superior autofocus method. PGA assumes a narrow beam, which is valid for most SAR systems. However, lower altitude SARs have large range dependencies that cannot be ignored. A new phase estimator for PGA is introduced and extended to allow range dependence An ERS-1 image of Death Valley is used in simulations comparing the new estimator to the widely used maximum likelihood approach and in demonstrating the range-dependent PGA algorithm

Keywords

geophysical signal processing; geophysical techniques; radar imaging; remote sensing by radar; synthetic aperture radar; terrain mapping; PGA algorithm; SAR; geophysical measurement technique; land surface; motion-induced blur; phase estimator; radar imaging; radar remote sensing; range dependent phase gradient autofocus; spotlight synthetic aperture radar; terrain mapping; Azimuth; Electronic mail; Electronics packaging; Focusing; Instruments; Maximum likelihood estimation; Phase estimation; Radar imaging; Satellites; Synthetic aperture radar;

fLanguage

English

Publisher

ieee

Conference_Titel

Geoscience and Remote Sensing Symposium Proceedings, 1998. IGARSS '98. 1998 IEEE International

Conference_Location

Seattle, WA

Print_ISBN

0-7803-4403-0

Type

conf

DOI

10.1109/IGARSS.1998.702303

Filename

702303