Title :
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
fDate :
March 31 2008-April 4 2008
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;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2008. ICASSP 2008. IEEE International Conference on
Conference_Location :
Las Vegas, NV
Print_ISBN :
978-1-4244-1483-3
Electronic_ISBN :
1520-6149
DOI :
10.1109/ICASSP.2008.4517850
