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基于停滞检测粒子群算法的阵列天线方向图综合.docx

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基于停滞检测粒子群算法的阵列天线方向图综合 Abstract Inthispaper,anovelapproachofusingthestagnationdetectionparticleswarmoptimizationalgorithmforthesynthesisofantennaarraydirectionaldiagramisproposed.Theproposedmethodaimstooptimizethearrayfactoroftheantennawhiletakingintoaccountthelimitationsofthephysicalarchitectureofthesystem.Acomprehensiveanalysisoftheadvantagesandlimitationsoftheproposedmethodispresented,followedbyexperimentalresultsandconclusions. Introduction Theuseofantennaarraystotransmitorreceivesignalshasbecomeincreasinglypopularovertheyearsduetotheadvancementsincommunicationtechnology.Theabilitytosteertheantennabeaminaspecificdirectionisparamountinachievingbettersignalquality,reliabilityandcoverage.Thesynthesisofthedirectionaldiagramoftheantennaarrayisacriticalaspectofachievingtheseobjectives. Variousmethodshavebeenproposedforthesynthesisofantennaarraydirectionaldiagrams,includinggeneticalgorithms,simulatedannealing,particleswarmoptimization(PSO),anddifferentialevolution.However,thesetraditionaloptimizationmethodssufferfromsomedrawbacks,includingslowconvergencerates,beingstuckinlocalminima,andaninabilitytohandleconstraints. Inrecentyears,anewtypeofPSOalgorithm,calledthestagnationdetectionPSOalgorithm,hasbeenproposed.Thealgorithmhasshownsignificantimprovementsinoptimizationefficiencywhenappliedtolarge-scaleoptimizationproblems.Therefore,inthispaper,weproposeusingthestagnationdetectionPSOalgorithmforthesynthesisofantennaarraydirectionaldiagrams. Methodology Inthisstudy,weusealinearantennaarraycomposedofN+1equallyspacedisotropicradiators.Thearrayfactorisdefinedas: AF(θ)=∑_(n=0)^Nw_ncos⁡(nθ+φ_n) Wherew_nistheweightcoefficientofthenthradiator,φ_nisthephaseshift,andθistheangleofarrival. Theobjectiveofthesynthesisofthedirectionaldiagramistomaximizethepeaksidelobelevel(PSLL)whilemaintaininganullinaspecificangleofarrival.ThePSLLisgivenby: PSLL=20log_10⁡⁡{max(∣AF(θ)∣^2)/∣AF(θ=0)∣^2} Totakeintoaccountthephysicallimitationsofthesystem,weintroduceconstraintsintheoptimizationproblem.Theseco