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时间:2019-11-26
《弹道中段目标进动周期估计的改进自相关法》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第31卷2010年第4期4月航空学报ACTAAERONAUTlCAETASTRONAUTICASINICAV01.31No.4Apr.2010文章编号:lOOO一6893(2010)04一0812一07弹道中段目标进动周期估计的改进自相关法肖立,周剑雄,何峻,付强(国防科学技术大学ATR实验室,湖南长沙410073)ImprovedAutocorrelationI订ethodfbrPrecessionPeriodEstimationOfBalljsticTar霉etinMidcourseXiaoLi,ZhouJianxiong,HeJun,
2、FuQiang(ATRLaboratory,NationalUnivefsityofDefenseTechnology,Changsha410073,China)摘要:自相关法可用于估计弹道中段雷达目标的进动周期,它需要预先给出进动周期的上下限。进动周期下限可能远小于真实进动周期,此时自相关法的估计性能将严重下降。定义了自相关函数(ACF)的凸包,在此基础上提出了一种改进的自相关法。首先求出ACF和其凸包的差函数,然后搜索差函数的最大值,从而得到进动周期的估计值。理论分析和仿真结果表明:当进动周期下限和真实迸动周期相差不大时,该方法的估计性
3、能接近白相关法;当进动周期下限远小于真实进动周期时,该方法仍然具有良好的估计性能;由于进动周期的上下限之比通常大于2,因此该方法的计算量比自相关法增大的倍数小于1.4;同时它对先验信息的要求非常宽松。因此该方法具有广泛的适用性。关键词:运动估计;频率估计;自相关;相关法;导弹;雷达目标识别中图分类号:TN957.52文献标识码:AAbstmct:Theautocorrelationmethodcanbeusedtoestimatetheprecessionperiodofaballisticradartargetinmidcourse,fo
4、rwhichitisnecessarythattheupperandlowerboundsoftheprecessionperiodbegiveninad—vance.However,thelowerboundoftheprecessionperiodprovidedmaybefarlessthanthetrueprecessionperiod,whichwillseriouslydegradetheestimationperformance.AnimproVedautocorrelationmethodispro—posedbydefin
5、ingtheconvexhulloftheautocorrelationfunction(ACF).ThedifferencefunctionbetweentheACFarldtheconvexhullisobtained,arldthentheprecessionperiodisestimatedbysearchingforthemaximumvalueofthedifferencefunction.ThetheoreticaIanalysisanclsimulationresultsshowthattheestimationper—f0
6、姗anceoftheproposedmethodisclosetotheautocorrelationmethodwhenthelowerboundisnotfarIessthanthetrueprecessionperiod.Whenthelowerboundisfarlessthanthetrueprecessionperiod,theproposedmethodstillhasgoodestimationperfo瑚ance.Usuallytheratiooftheupperbourldtothelowerboundislar—ger
7、than2,resultinginthecomputationalburdenoftheproposedmethodlessthan1.4timesofthatoftheau—tocorrelationmethod.Alsoitisveryeasytomeetthepriorinfo咖ationrequirementforthepmposedmethod.Thereforetheproposedmethodcanbeusedwidely.1(eywords:motionestimation;frequencyestimation;autoc
8、orreIation;correIationmethods;missiIes,radartargetrecOgnition在弹道中段,弹头伴随着诱饵在大气层外飞行,防御方需要地基
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