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1、摘要MIMO雷達(dá)是最近幾年提出的一種新體制雷達(dá),鑒于其潛在的優(yōu)勢(shì),受到雷達(dá)界的廣泛關(guān)注。該體制雷達(dá)采用MIMO技術(shù),引入了空間分集和波形分集的思想,在目標(biāo)檢測(cè)、參數(shù)估計(jì)等方面比傳統(tǒng)雷達(dá)具有明顯優(yōu)勢(shì)。關(guān)于MIMO雷達(dá)的研究總體上還處于理論分析和實(shí)驗(yàn)驗(yàn)證階段,而本文針對(duì)MIMO雷達(dá)的波形設(shè)計(jì)展開研究,主要工作如下:首先,構(gòu)建了MIMO雷達(dá)的信號(hào)模型,分析了MIMO雷達(dá)的基本思想和收發(fā)通道矩陣的性質(zhì);簡(jiǎn)要介紹了幾種波形設(shè)計(jì)方法及其基本思想,為進(jìn)一步的研究工作奠定基礎(chǔ)。接著,研究了基于波束圖綜合的編碼信號(hào)設(shè)計(jì)方法。利用凸優(yōu)化算法,合理地選擇發(fā)射信號(hào)的相關(guān)
2、矩陣,以綜合期望的波束圖。在此基礎(chǔ)上,從概率論的角度出發(fā),給出了基于波束圖綜合的M相隨機(jī)編碼信號(hào)的設(shè)計(jì)方法;利用循環(huán)優(yōu)化算法,給出了基于波束圖綜合的低峰值與平均功率比的編碼信號(hào)設(shè)計(jì)方法。最后,在雜波統(tǒng)計(jì)特性已知的條件下,基于互信息量和最小均方誤差兩種不同的標(biāo)準(zhǔn)來優(yōu)化設(shè)計(jì)MIMO雷達(dá)空時(shí)編碼信號(hào),給出了優(yōu)化編碼信號(hào)的形式。不同條件下的仿真證明系統(tǒng)采用該優(yōu)化編碼信號(hào)具有較強(qiáng)的雜波抑制能力,改善了目標(biāo)的檢測(cè)性能。關(guān)鍵詞:MIMO雷達(dá)正交編碼波束圖綜合互信息量最小均方誤差A(yù)bstractMIMOradarisanewradarsystemwhichhas
3、beenproposedinrecentyears.Becauseofitspotentialadvantages,MIMOradarattractswidespreadconcem.ThisradarsystemuSiIlgMIMOtechnologyimportsspatialdiversityandwaveformdiversity,throughwhichMIMOradarremarkablyimprovescapabilitiesoftargetdetectionandparameterestimationcompared誦thgene
4、ralphased—arrayradar.Ingeneral,theresearchofMIMOradarstillremainstheoreticalanalysisandexperimentalvalidation,thisthesisputstheemphasisonthestudyofMIMOradarwaveformdesign.FirstlyaMIMOradarsignalmodelismade,whilethebasicideaofMIMOradarandthecharactersoftransmitterandreceiverch
5、annelmatrixareanalyzed.Severalwaveformdesignmethodsarebrieflyintroducedinordertolaythefoundationforfurtherresearchwork.Thenthethesisintroducesamethodofwaveformdesignbasedonthebeam-patternsynthesis,whichusesaconvexoptimizationalgorithmtochoosethesignalcorrelationmatrixforsynth
6、esizingadesiredbeam-pattern.Onthisbasis,thethesisanalysesadesignmethodofM—phasedrandomcodingsignalintheviewofprobabilitytheoryandadesignmethodoflowpeak-to·-average··powerratiosignalbasedoncyclicoptimizationalgorithm.Finallyundertheconditionthatthestatisticalpropertiesofclutte
7、risknown,thethesispresentsindetailspace-timesignaldesignmethodforMIMOradarbasedonmutualinformationandminimummean·squareerrorcriteria.Anoptimizedcodeisdeduced.Thesimulationsofdifferentconditionsshowthattheoptimizedspace—timecodehasadvantagesofastrongcluttersuppressioncapabilit
8、yandbettertargetdetectionperformance.Keyword:MIMOradarOrthogonalcodi