Autofocus in multistatic passive SAR imaging

Author

Liu, Kuang-Hung ; Munson, David C., Jr.

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Univ. of Michigan, Ann Arbor, MI

fYear

2008

fDate

March 31 2008-April 4 2008

Firstpage

1277

Lastpage

1280

Abstract

Synthetic aperture radar (SAR) imaging suffers from image focus degradation in the presence of phase errors in the received signals due to unknown platform or target motion. We study automatic focusing (autofocus) under a multistatic passive scenario, where the illumination is provided by a set of stationary UHF transmitters and the goal is to image a moving aircraft. We employ heuristic iterative estimation algorithms that maximize a sharpness metric of the image. A similar method has been studied for the case of mono-static radar, where only one antenna is used for both transmitting and receiving. We present simulation results to help assess the effectiveness of the proposed autofocus approach.

Keywords

iterative methods; radar imaging; synthetic aperture radar; automatic focusing; heuristic iterative estimation algorithms; image focus degradation; mono-static radar; multistatic passive SAR imaging; multistatic passive scenario; phase errors; received signals; receiving antenna; stationary UHF transmitters; synthetic aperture radar imaging; target motion; transmitting antenna; Aircraft; Degradation; Focusing; Heuristic algorithms; Iterative algorithms; Lighting; Radar antennas; Radar polarimetry; Synthetic aperture radar; Transmitters; SAR; autofocus; phase estimation; sharpness;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech and Signal Processing, 2008. ICASSP 2008. IEEE International Conference on

Conference_Location

Las Vegas, NV

ISSN

1520-6149

Print_ISBN

978-1-4244-1483-3

Electronic_ISBN

1520-6149

Type

conf

DOI

10.1109/ICASSP.2008.4517850

Filename

4517850