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基于极化敏感阵列均匀线阵的二维DOA估计.docx

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基于极化敏感阵列均匀线阵的二维DOA估计 Abstract: Thispaperpresentsastudyontwo-dimensionaldirection-of-arrival(DOA)estimationusingpolarizationsensitiveuniformlineararrays(ULA).Thistechniqueinvolvestheuseofpolarization-sensitiveantennasplacedinaULAconfigurationtodeterminetheazimuthandelevationanglesofincomingsignals.Inthisstudy,wediscusstheprinciplesofpolarizationsensitivearraysandtheiruseinDOAestimation,followedbyananalysisoftheperformanceandlimitationsofthistechnique.Simulationresultsarepresentedtoillustratetheeffectivenessoftheproposedmethod,andtheadvantagesanddisadvantagesofthepolarization-sensitiveULAapproacharediscussed. Introduction: Direction-of-arrival(DOA)estimationisafundamentaltaskinsignalprocessingandhasfoundapplicationsinmanyfieldsincludingradar,sonar,andcommunicationsystems.TraditionalDOAestimationmethodsarebasedontheuseofantennaarrays,wheretheangleofarrivalofasignalisdeterminedbyexploitingthephasedifferencesbetweenthesignalsreceivedatdifferentantennaelements.Thisapproachislimitedtoestimatingtheazimuthanglesofincomingsignals,anddoesnotprovideinformationontheelevationangle. Toestimateboththeazimuthandelevationanglesofincomingsignals,polarization-sensitivearrayscanbeused.Thesearraysconsistofantennasthataredesignedtobesensitivetothepolarizationofincomingsignals.ByplacingtheseantennasinaULAconfiguration,thepolarization-sensitivesignalsreceivedbyeachantennacanbeusedtoestimatetheazimuthandelevationanglesoftheincomingsignal. PrinciplesofPolarization-SensitiveArrays: Apolarization-sensitiveantennacontainstwoormoreelementsthataredesignedtoreceivesignalsthatarepolarizedindifferentdirections.Whenasignalisincidentontheantenna,thereceivedvoltageateachelementwilldependonthepolarizationofthesignal.Bymeasuringthevoltageratiobetweentheelements,thepolarizationoftheincomingsignalcanbedetermined.ThisinformationcanbeusedtoestimatetheDOAoftheincomingsignal. Apolarization-sensitiveULAconsistsofanumberofpolarization-sensitiveantennasarrangedinalineararray.Thesignalsreceivedbyeachantennaelementa