Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Autofocus for high resolution ISAR imaging

 
: Holzner, J.; Gebhardt, U.; Berens, P.

Informationstechnische Gesellschaft -ITG-:
EUSAR 2010, 8th European Conference on Synthetic Aperture Radar. CD-ROM : 7 - 10 June 2010, Aachen, Germany
Berlin: VDE-Verlag, 2010
ISBN: 978-3-8007-3272-2
4 S.
European Conference on Synthetic Aperture Radar (EUSAR) <8, 2010, Aachen>
Englisch
Konferenzbeitrag
Fraunhofer FHR

Abstract
This paper investigates autofocus techniques for high resolution airborne Inverse SAR (ISAR) imaging of ground moving vehicles. The FHR PAMIR instrument which can be mounted onboard a Transall C-160 provides high resolution range data with resolutions in the order of 10 cm. ISAR images of even private cars may be acquired in this way. For the generation of such images translational and rotational motion components of the target must be known. These can be either derived from GPS data which is usually not available or from combining range tracking and road information. Errors in the geometrical data lead to a defocusing of the images and severe image degradation. If at least the rotational motion component is known accurately enough remaining translational motion components may be estimated from the data using autofocus techniques like prominent point processing (PPP), phase gradient autofocus (PGA) or image contrast based autofocussing techniques (ICT). This paper shows some of the known autofocus techniques and compares results achieved with real data.

: http://publica.fraunhofer.de/dokumente/N-203448.html