Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Development of an Ultra Wide-Band(UWB) Synthetic Aperture Radar (SAR)System for Imaging of Near Field Object
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Ultra-wideband (UWB) technology and its use in imaging and sensing have drawnsignicant interest in the last two decades. Extensive studies have contributed toutilize UWB transient scattering for automated target recognition and imagingpurposes. In this thesis a near-eld UWB synthetic aperture radar (SAR) imagingalgorithm is presented.It is shown with measurements and simulation, that it is possible to reconstruct an imageof an object in the near eld region using UWB technology and SAR imaging algorithm.However the nal SAR image is highly aected by unwanted scattered elds at each pixelusually observed as an image artifact in the nal image. In this study these artifactsare seen as a smile around the main object. Two methods are suggested in this thesiswork to suppress this artifact. The rst method combines the scattered eld informationreceived from both rear and front of the object to reconstruct two separate images, onefrom rear view and one from front view of the object respectively. Since the scatteredelds from behind the object are mirrored, the pixel by pixel multiplication of thesetwo images for objects with simple geometry will cancel the artifact. This method isvery simple and fast applicable to objects with simple geometry. However this methodcannot be used for objects with rather complex geometry and boundaries. Thereforethe Range Point Migration (RPM) method is used along with the global characteristicsof the observed range map to introduce a new artifact rejection method based on thedirectional of arrival (DOA) of scattered elds at each pixel. DOA information can beused to calculate an optimum theta for each antenna. This optimum angle along withthe real physical direction of arrival at each position can produce a weighting factor thatlater can be used to suppress the eect of undesired scattered elds producing the smileshaped artifact. Final results of this study clearly show that the UWB SAR accompaniedwith DOA can produce an image of an object free of undesired artifact from scatteredeld of adjacent antennas.

Place, publisher, year, edition, pages
2012. , 69 p.
Keyword [en]
Bow Tie Antenna, Ultra Wideband (UWB), Synthetic Aperture Radar (SAR), Direction of Arrival (DOA).
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:umu:diva-66918OAI: oai:DiVA.org:umu-66918DiVA: diva2:609780
External cooperation
Chalmers university of technology
Subject / course
Elektronik
Educational program
Master's Programme in Robotics and Control
Presentation
2012-11-16, Sweden, Hörsalsvägen 11, ED-building main entrance, 6th floor,blue room, Gothenberg, Chalmers University of technology, 10:11 (English)
Uppsok
Technology
Supervisors
Examiners
Available from: 2013-04-19 Created: 2013-03-07 Last updated: 2013-04-19Bibliographically approved

Open Access in DiVA

Master of Science Thesis(5125 kB)984 downloads
File information
File name FULLTEXT01.pdfFile size 5125 kBChecksum SHA-512
90835f4a8c665edbde093ab1f7412175e80cf71e488e5cbd0560443fed974213363d1fe384dc0c1f443c41e4e814a7c3e69ce833b5642a5e42069d72ef8eb1d3
Type fulltextMimetype application/pdf

By organisation
Department of Applied Physics and Electronics
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 984 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 332 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf