DocumentCode :
2701452
Title :
Autofocusing of (inverse) synthetic aperture radar for motion compensation
Author :
Cantalloube, Hubert M J ; Nahum, Carole E.
Author_Institution :
Office Nat. d´´Etudes et de Recherches Aerospatiales, Chatillon, France
Volume :
1
fYear :
1996
fDate :
20-23 May 1996
Firstpage :
309
Abstract :
Ground imaging from an airborne synthetic aperture radar (SAR) and conversely aircraft imaging from a ground based radar (ISAR) require the knowledge of the motion of the antenna relative to the target, with an accuracy of a fraction of the wavelength upon a time span of seconds. This information is not necessarily directly available from navigation/tracking data and must be recovered from the radar data itself using the technique well known as autofocus. The approach described in this paper divides the problem into two time scales. The fast disturbances (antenna vibrations, tracking noise) of the motion with respect to the nominal trajectory are handled before range compression by the complex valued correlation technique. The slow disturbances (inertial drifts, error accumulation) are handled by a frame drift-like technique, derived from image sequence analysis. As side effect, this method may also provide alternative techniques for moving target detection and for accurate odometry (measure of the ground speed of the carrier aircraft)
Keywords :
airborne radar; correlation methods; image sequences; motion compensation; radar tracking; search radar; synthetic aperture radar; airborne radar; aircraft imaging; antenna vibrations; autofocusing; complex valued correlation technique; frame drift-like technique; ground based radar; ground imaging; image sequence analysis; motion compensation; moving target detection; odometry; radar data; synthetic aperture radar; tracking noise; Airborne radar; Aircraft navigation; Aperture antennas; Radar antennas; Radar imaging; Radar tracking; Synthetic aperture radar; Target tracking; Trajectory; Wavelength conversion;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Aerospace and Electronics Conference, 1996. NAECON 1996., Proceedings of the IEEE 1996 National
Conference_Location :
Dayton, OH
ISSN :
0547-3578
Print_ISBN :
0-7803-3306-3
Type :
conf
DOI :
10.1109/NAECON.1996.517663
Filename :
517663
Link To Document :
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