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1、第36卷第3期電子與信息學(xué)報(bào)Vol.36No.32014年3月JournalofElectronics&InformationTechnologyMar.2014線性調(diào)頻連續(xù)波信號(hào)檢測與參數(shù)估計(jì)算法*朱文濤蘇濤楊濤鄭紀(jì)彬張龍(西安電子科技大學(xué)雷達(dá)信號(hào)處理國家重點(diǎn)實(shí)驗(yàn)室西安710071)摘要:針對(duì)長時(shí)間積累的方法較難在線性調(diào)頻連續(xù)波信號(hào)的檢測和參數(shù)估計(jì)中應(yīng)用的問題,該文基于歸一化變窗長相干平均法,提出一種聯(lián)合幀間相關(guān)法與循環(huán)平穩(wěn)法的線性調(diào)頻連續(xù)波信號(hào)檢測與參數(shù)估計(jì)算法。該方法首先利用歸一化變窗長相干平均法實(shí)現(xiàn)噪聲方差的一致性,然后
2、在此基礎(chǔ)上利用幀間相關(guān)法實(shí)現(xiàn)周期的精確估計(jì),最后利用循環(huán)平穩(wěn)法估計(jì)信號(hào)的相位參數(shù)。該算法以較低的計(jì)算復(fù)雜度實(shí)現(xiàn)信號(hào)的長時(shí)間積累,在低信噪比條件下具有較好的估計(jì)性能。仿真結(jié)果驗(yàn)證了該方法的有效性。關(guān)鍵詞:信號(hào)檢測;參數(shù)估計(jì);線性調(diào)頻連續(xù)波信號(hào);歸一化變窗長相干平均;幀間相關(guān);循環(huán)平穩(wěn)中圖分類號(hào):TN957.51文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1009-5896(2014)03-0552-07DOI:10.3724/SP.J.1146.2013.00676DetectionandParameterEstimationofLinearFreq
3、uencyModulationContinuousWaveSignalZhuWen-taoSuTaoYangTaoZhengJi-binZhangLong(NationalLaboratoryofRadarSignalProcessing,XidianUniversity,Xi’an710071,China)Abstract:Todealwiththeissuethatthelongtimeaccumulationmethodishardtobeappliedtothedetectionandparameterestimatio
4、nofLinearFrequencyModulatedContinuousWave(LFMCW)signal,anovelalgorithmcombiningthejointinter-framecorrelationmethodandcyclostationarymethodisproposedtodetectLFMCWsignalandestimateitsparameters.Firstly,consistencyofnoisevarianceiscompletedbythenormalizedwindow-variant
5、coherentaveragemethod.Then,onthisbasis,theperiodisexactlyestimatedwithinter-framecorrelationmethod.Finally,cyclostationarymethodisutilizedtoestimatethephaseparametersofLFMCWsignal.Theproposedalgorithmrealizeslongtimeaccumulationwithlowcomputationalcomplexity.ForlowSi
6、gnal-to-NoiseRatio(SNR),thismethodstillachievesgoodestimationperformance.Simulationresultsverifytheeffectivenessoftheproposedmethod.Keywords:Signaldetection;Parameterestimation;LinearFrequencyModulatedContinuousWave(LFMCW)signal;Normalizedwindow-variantcoherentaverag
7、e;Inter-framecorrelation;Cyclostationary?1引言LPI)雷達(dá)首選的信號(hào)形式。當(dāng)雷達(dá)發(fā)射該信號(hào)進(jìn)行偵察時(shí),對(duì)于非協(xié)作性的電子偵察而言,實(shí)現(xiàn)低信調(diào)頻連續(xù)波(FMCW)雷達(dá)由于結(jié)構(gòu)簡單、體積噪比條件下的信號(hào)檢測和參數(shù)估計(jì)存在較大的挑戰(zhàn)小、距離分辨率高、無距離盲區(qū)、成本低、低功耗和困難,因此快速有效地實(shí)現(xiàn)長時(shí)間積累是實(shí)現(xiàn)信和低截獲等優(yōu)點(diǎn),在軍用導(dǎo)航、戰(zhàn)場偵察與地面成[13]-號(hào)偵察的必要手段。文獻(xiàn)[4]利用高階統(tǒng)計(jì)量對(duì)噪聲像等領(lǐng)域得到越來越廣泛的應(yīng)用。鋸齒波線性不敏感的優(yōu)點(diǎn),結(jié)合濾波器組取得了較好
8、效果,文調(diào)頻連續(xù)波(SawtoothLFMCW,SLFMCW)信號(hào)和獻(xiàn)[5]在文獻(xiàn)[4]的基礎(chǔ)上進(jìn)行了改進(jìn),減小了計(jì)算量,對(duì)稱三角線性調(diào)頻連續(xù)波(SymmetricalTriangular但是濾波器組的設(shè)計(jì)和選擇限制了這兩種方法參數(shù)LFMCW,STLFMCW)信