Ground-based ISAR imaging of cooperative and non-cooperative sea vessels with 3-D rotational motion

Simple item page
dc.contributor.advisorInggs, Michaelen_ZA
dc.contributor.advisorNel, W A Jen_ZA
dc.contributor.authorGaffar, Mohammed Yunus Abdulen_ZA
dc.date.accessioned2014-09-26T07:15:16Z
dc.date.available2014-09-26T07:15:16Z
dc.date.issued2009en_ZA
dc.descriptionIncludes bibliographical references (leaves 175-188).en_ZA
dc.description.abstractInverse Synthetic Aperture Radar (ISAR) images of sea vessels are a rich source of information for radar cross section (RCS) measurement and ship classification. However, ISAR imaging of sea vessels is a challenging task because the 3-D rotational motion of such vessels often gives rise to blurring. Blurry ISAR images are not desirable because they lead to inaccurate parameter estimation, which reduces the probability of correct classification. The objective of this thesis is to explain how 3-D rotational motion causes blurring in ISAR imagery and to develop effective techniques for imaging cooperative and non-cooperative sea vessels for RCS measurement and ship-classification purposes respectively. Much research has been done to investigate the effect of 3-D rotational motion on an ISAR image under the assumption that an object's axis of rotation is constant over the coherent processing interval (CPI). In this thesis, a new quaternion-based system model is proposed to characterise the amount of blurring in an ISAR image when a sea vessel possesses 3-D rotational motion over a CPI. Simulations were done to characterise the migration of a scatterer through Doppler cells due to the time-varying nature of the Doppler generating axis of rotation. Simulation results with realistic 3-D rotational motion show substantial blurring in the cross-range dimension of the resulting ISAR image, and this blurring is attributed to the time-varying nature of the angle of the Doppler generating axis of rotation and the object's rotation rate over the CPI.en_ZA
dc.identifier.apacitationGaffar, M. Y. A. (2009). <i>Ground-based ISAR imaging of cooperative and non-cooperative sea vessels with 3-D rotational motion</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering. Retrieved from http://hdl.handle.net/11427/7696en_ZA
dc.identifier.chicagocitationGaffar, Mohammed Yunus Abdul. <i>"Ground-based ISAR imaging of cooperative and non-cooperative sea vessels with 3-D rotational motion."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 2009. http://hdl.handle.net/11427/7696en_ZA
dc.identifier.citationGaffar, M. 2009. Ground-based ISAR imaging of cooperative and non-cooperative sea vessels with 3-D rotational motion. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Gaffar, Mohammed Yunus Abdul AB - Inverse Synthetic Aperture Radar (ISAR) images of sea vessels are a rich source of information for radar cross section (RCS) measurement and ship classification. However, ISAR imaging of sea vessels is a challenging task because the 3-D rotational motion of such vessels often gives rise to blurring. Blurry ISAR images are not desirable because they lead to inaccurate parameter estimation, which reduces the probability of correct classification. The objective of this thesis is to explain how 3-D rotational motion causes blurring in ISAR imagery and to develop effective techniques for imaging cooperative and non-cooperative sea vessels for RCS measurement and ship-classification purposes respectively. Much research has been done to investigate the effect of 3-D rotational motion on an ISAR image under the assumption that an object's axis of rotation is constant over the coherent processing interval (CPI). In this thesis, a new quaternion-based system model is proposed to characterise the amount of blurring in an ISAR image when a sea vessel possesses 3-D rotational motion over a CPI. Simulations were done to characterise the migration of a scatterer through Doppler cells due to the time-varying nature of the Doppler generating axis of rotation. Simulation results with realistic 3-D rotational motion show substantial blurring in the cross-range dimension of the resulting ISAR image, and this blurring is attributed to the time-varying nature of the angle of the Doppler generating axis of rotation and the object's rotation rate over the CPI. DA - 2009 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2009 T1 - Ground-based ISAR imaging of cooperative and non-cooperative sea vessels with 3-D rotational motion TI - Ground-based ISAR imaging of cooperative and non-cooperative sea vessels with 3-D rotational motion UR - http://hdl.handle.net/11427/7696 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/7696
dc.identifier.vancouvercitationGaffar MYA. Ground-based ISAR imaging of cooperative and non-cooperative sea vessels with 3-D rotational motion. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 2009 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/7696en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Electrical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherElectrical Engineeringen_ZA
dc.titleGround-based ISAR imaging of cooperative and non-cooperative sea vessels with 3-D rotational motionen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
thesis_ebe_2009_gaffar_m.pdf
Size:
12.49 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
PhD / Doctoral