Radar cross section (RCS) of perfectly conducting (PEC) thin wires and its application to radar countermeasure: Chaff

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buir.advisorAltıntaş, Ayhan
dc.contributor.authorDalkıran, Rıfat
dc.date.accessioned2016-01-08T20:18:40Z
dc.date.available2016-01-08T20:18:40Z
dc.date.issued2015
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.descriptionAnkara : The Department of Electrical and Electronics Engineering and the Graduate School of Engineering and Science of Bilkent University, 2015.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 2015.en_US
dc.descriptionIncludes bibliographical references leaves 117-121.en_US
dc.description.abstractIn electronic warfare, active and passive countermeasures are used to jam threat RF radars. While electronic jamming pods are accepted as an active one, chaff is accepted as a passive countermeasure that consists of millions of perfectly conducting thin metallic wires, dipoles. The aim of this thesis is to first implement Van Vleck’s Methods A and B [1], Tai’s Variational Method [2] and Einarsson’s Direct Method [3] to get radar cross section (RCS) of a dipole and then apply the results to calculate RCS of designed chaff cartridges. The ultimate goal is to suggest more effective passive countermeasure system than commercially available ones. In this thesis, performances of these methods are evaluated. According to these evaluations, Van Vleck’s Method B and Einarsson’s Direct Method are selected for calculating RCS of chaff cartridges. Performance of RR-178 (XN-2) commercial chaff cartridge is compared with three different suggested designs. For each of these designs, 2 to 20 GHz frequency interval is divided into three or six equal sub-frequency intervals and for these intervals particular chaff cartridges with different dipole lengths and numbers are proposed. In terms of total dipole length in the cartridges, instead of 88775 meters dipoles that is used in RR- 178 (XN-2), by using chaff cartridges of third proposed design, in average only 25300 meters dipoles are used while providing more flat and equal average RCS value for 2 to 20 GHz frequency interval. Moreover, for the stated frequency interval, if total dipole length for the chaff cartridges of RR-178 (XN-2) and third proposed design keep equal, about 5.2 dB increase in average RCS value is obtained. Analysis of these results shows that designed chaff cartridges are more effective than commercial ones if the designed ones are used together with compatible Radar Warning Receiver (RWR) and Dispensing System.en_US
dc.description.degreeM.S.en_US
dc.description.statementofresponsibilityDalkıran, Rıfaten_US
dc.embargo.release2017-08-15
dc.format.extentxviii, 121 leaves, chartsen_US
dc.identifier.itemidB151120
dc.identifier.urihttp://hdl.handle.net/11693/18371
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectRadar Cross Section (RCS)en_US
dc.subjectDipoleen_US
dc.subjectThin Wireen_US
dc.subjectChaffen_US
dc.subjectVariational Methoden_US
dc.subjectDirect Methoden_US
dc.subjectIntegral Methoden_US
dc.subjectDispensing Systemen_US
dc.subjectRadar Warning Receiver (RWR)en_US
dc.subject.lccTK6580 .D35 2015en_US
dc.subject.lcshRadar.en_US
dc.subject.lcshRadar cross sections.en_US
dc.subject.lcshRadar confusion reflections.en_US
dc.titleRadar cross section (RCS) of perfectly conducting (PEC) thin wires and its application to radar countermeasure: Chaffen_US
dc.typeThesisen_US
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