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2011-12-08

PhD: Ultrawideband-ultrawidebeam Synthetic Aper...

Doctoral student Vu Viet Thuy will defend his doctoral thesis in Applied signal processing.

Time: 8 December 2011 at 14:00
Place: Gradängsal J1610, House J, BTH, Campus Gräsvik, Karlskrona

Thesis title: Ultrawideband-ultrawidebeam Synthetic Aperture Radar - Signal Processing and Applications

Research subject: Applied signal processing

Principal supervisor and Examiner: Professor Hans-Jürgen Zepernick, BTH

Supervisor: Professor Mats Pettersson, BTH

Faculty examiner: Dr. Michael J. Minardi, Air Force Research Laboratory, USA

Examining committee:

  • Professor Simon Watts, Thales, Great Britain
  • Professor Bertil Svensson, Halmstad University
  • Professor Lars-Erik Andersson, Linköping University

Deputy member of examining committee: Docent Nedelko Grbic, BTH

Please notify Heleen Podsedkowska no later than December 1 if you intend to participate.

Link to thesis

Abstract

This dissertation presents practical issues in Ultrawideband - Ultrawidebeam (UWB) Synthetic Aperture Radar (SAR) signal processing and crucial applications developed on UWB SAR. In the context of this dissertation, UWB SAR refers to the SAR systems utilizing large fractional bandwidth signals and synthesizing long apertures associated with wide antenna beamwidths. On one hand, such specific systems give us opportunities to develop unique applications. One the other hand, signal processing for data collected by these systems is very challenging and therefore requires much effort due to their characteristics. The research results presented in this thesis are divided into two parts: signal processing and application.

In the signal processing part, the tools supporting the UWB SAR system design and evaluation are introduced. They include an Impulse Response Function in UWB SAR imaging (IRF-SAR), azimuth and range resolution equations for UWB SAR, and a definition of UWB SAR quality measurements. Pre-processing, processing and post-processing for UWB SAR are also topics that will be examined in the signal processing part. The processing is here defined by SAR algorithms. With this definition, the pre-processing refers to RFI suppression approaches whereas the post-processing implies apodization or sidelobe control methods.

In the application part, GroundMoving Target Indication (GMTI) is selected for study due to its interest to both military and civilian endusers. The GMTI technique developed for UWB SAR relates to the moving target detection by focusing technique which can be combined with the space-time processing such as Displaced Phase Center Antenna (DPCA) and Space-Time Adaptive Processing (STAP).

 

Organizer:
School of Engineering

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