时间尺度算法_精密时钟综合算法_的研究

陕西天文台台刊222CSAOPublications199912()朱守红(,,710600)时间尺度是通过综合众多精密时钟得到的时间尺度的计算目前主要采用类ALGOS算法,这类算法的缺点是权值没有准确反映精密时钟噪声参数以及不能使五种噪声分量同时达到优化综合和不能形成实时的时间尺度从精密时钟综合的优化算法原理出发,探讨了精密时钟噪声参数的估计精密时钟噪声中噪声分量的分解等问题的解决方法,并由此提出了较优化的时间尺度算法(精密时钟综合算法),还提出了对现有算法的改进意见P1271,(),T(t):T(t)=T1(t)+Td(t)+x(t)(1)TI(t),Td(t),x(t)T(t)=TI(t)+x(t)(2)x(t),,x(t),,,(),[1],x(t)=0=-4x(t),Sx(f)=gf,=-4,k,0(3)ALLAN[2][3]x(t),1[4],x-4(t)x-3(t)x-2(t),1998-12-21,1999-12-152ALLAN1ALLAN2ALLAN,Ts(t)=TI(t)+xs(t)(4)xs(t),[5][4]BIPM,TAITA(K)ALGOS[6]ALGOS[7][8]:;;:,,ALGOS[4];,,,ALGOS(x-4(t)),[9]~[12];,,[4][13]~[16],,,[9]~[12],:,,,[4][4][17]~[21],()28222xim(t)=xi(t)+xm(t)(5),TAI,TA(K)1xsm(t)=xs(t)-xm(t)(6)TAIEAL,TA(K)3,(),,,,4,,,(ALLAN),,,,,,,,(),:(1),,:,,(2),[21]5,,!!!/[4][17][18][20]()83222:(),,,,,xsm(t)=Ni=1-4,i(t)x^-4,im(t)+Ni=1-3,i(t)x^-3,im(t)+Ni=1-2,i(t)x^-2,im(t)+K(7),xs(t)=Ni=1-4,i(t)x^-4,i(t)+Ni=1-3,i(t)x^-3,i(t)+Ni=1-2,i(t)x^-2,i(t)+K(8),,(7)(8)(8),6,:A.,;B.;C.;D.;E.;F.713,11g-4(ns2Hz3)g-3(ns2Hz2)g-2(ns2Hz2)10.0122020.0212030.022101,4,5(,)2,6,6()7,Allan88422342g-4(ns2Hz3)g-3(ns2Hz2)g-2(ns2Hz2)10.0132.557.1120.0190.7615.230.0221.8122.156788,,9(),11085222:()(,)1112,TAI,13,TAI14Allan910111213TAI1414,,8,,()8622,9,,,,:,,;,(),;,参考文献[1]J.A.Barnesetal.CharacterizationofFrequencyStability.IEEETrans.onIM,1971,20(2):[2]D.W.Allan.StatisticsofAtomicFrequencyStandards,Proc.IEEE,1966,54(2):[3]D.W.Allanetal.AModifiedAllanVariancewithIncreasedOscillatorCharacterizationAbility.Proc.IEEE35thFrequencyControlSymposium,1981[4]..,1996[5]..,1983[6]B.Guinot.BIHAnnualReportfor1973,Paris:1974[7]D.B.Percival.TheUSNavalObservatoryClockTimeScale.IEEETrans.onIM,1978,27(4):[8].(A),1987,17(8):[9]..,1991[10]..(A),1992,22(1):[11]G.Wei.AStudyofAtomicTimeScaleStability.Proc.of46thFrequencyControlSymposium,1992[12]G.Wei.AStudyofAtomicTimeScaleStability.ScienceinChina(SeriesA),1993,36(6):[13]J.A.Barnes.TimeScaleAlgorithmUsingKalmanFilterInsightfromSimulation.2ndInternationalTimeScaleAlgorithmSymposium,Boulder:1982[14]M.A.Weissetal.AStudyoftheNBSTimeScaleAlgorithm.IEEETrans.onIM,1989,38(2):[15]P.Tavella,C.Thomas.ComparativeStudyofTimeScaleAlgorithm.Metrologia:1991,28:[16]M.Weissetal.AT2,aNewTimeScaleAlgorithm:AT1PlusFrequencyVariance.Metrologia:1991,28:[17]S.Zhu.Anewtime-domainModelofPrecisionClockNoise.Proc.IEEE,InternationalFrequencyControlSymposium,1997[18]..,1997,20(1):[19].f-2.,1997,20(1):[20].f-1.,1998,21(2):[21]..,1998,21(2):87222:()AStudyonTimeScaleAlgorithm(SynthesisAlgorithmofPrecisionClocks)ZhuShouhong(ShaanxiAstronomicalObservatory,TheChineseAcademyofSciences,Lintong,Shaanxi,710600)AbstractTimescaleisgeneratedbysynthesizinganumberofprecisionclocks.ALGOSalgorithmorALGOS-likealgorithmisusuallyadoptedincomputationoftimescale.Thedefectsofthisalgorithmareasfollows:(1)theadoptedweightcannotreflectthenoiselevel,(2)thealgorithmcanoptimallysynthesizethenoisesforonecomponent,butnotforallcomponents,(3)thealgorithmcannotgeneratetimescaleinrealtime.Basedontheprincipleofoptimumalgorithmforprecisionclocksynthesis,thefollowingaspectsarestudied:(1)toestimatethenoisecoefficientsforprecisionclock,(2)toseparatethenoisecomponentsinprecisionclock,(3)toobtainthetimescaleinrealtime.Atlast,aimprovedalgorithmfortimescale(synthesialgorithmofprecisionclock)ispresentedandthesuggestiontoimprovetheexistingalgorithmisalsomadeinthispaper.KeywordsTimeScale;PrecisionClock;SynthesisAlgorithm8822