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Motion Compensation for a High Resolution Ka-Band Airborne FM-CW SAR

Author: Meta, A · Lorga, J.F.M. · Wit, J.J.M. de · Hoogeboom, P.
Type:article
Date:2005
Publisher: EuMA
Place: Louvain-la-Neuve
Institution: TNO Defensie en Veiligheid
Source:8th European Microwave Week EUMW, 2nd European Radar Conference, EuRad 2005, 6-7 October 2005, CNIT la Defense, Paris, France
Identifier: 223297
Keywords: Radar · Algorithms · Focusing · Image quality · Navigation systems · Synchronization · Synthetic aperture radar · Auto-focussing techniques · Demonstrator systems · Squint angle compensation · Motion compensation

Abstract

Airborne synthetic aperture radar is a promising new application for FM-CW radars. At the IRCTR, an operational demonstrator system has been developed in order to investigate the practicability of FM-CW SAR and to prove that an FM-CW SAR system can be operated in an efficient manner from a small platform. The platform used to fly the demonstrator system and the integrated navigation system will be introduced. In addition, the digitalization and the synchronization regarding the navigation system will be addressed. Subsequently, the motion compensation details, especially the squint angle compensation, are explained. The working status of the demonstrator system and the integrated navigation system is proven by the results of an airborne FM-CW SAR campaign. The results obtained during the airborne campaign are presented and the effect of squint angle compensation is shown. The airborne results could not be further improved by applying more sophisticated motion compensation algorithms or auto-focussing techniques. Therefore, it was decided to develop an improved FM-CW front end in order to enhance the FM-CW SAR image quality.