›› 2014, Vol. 34 ›› Issue (3): 46-52.doi: 10.3780/j.issn.1000-758X.2014.03.007

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ANovelDe-noisingAlgorithmBasedonUn-decimatedWaveletPacketTransform

LUWeitao1,ZHANGShuxian2,YANGWenge1,HONGJiacai1   

  1. (1TheAcademyofEquipment,Beijing101416)(2BeijingInstituteofTrackingandTelecommunicationsTechnology,  Beijing100094)
  • Received:2013-10-17 Revised:2014-01-07 Online:2014-06-25 Published:2014-06-25

Abstract: FilterprocessingisbeneficialtoimprovethequalityofreceivedsignalandthemeasuringperformanceofTT&Csystem.Ade-noisealgorithmusingShiftedUn-decimatedWaveletPacketTransform(SUWPT)wasmodified.InsteadofEnergyCompactionMeasure(ECM),thePowerFlatness(PF)wasusedinthenewalgorithmastheruletodecidewhetheranodewasneededtodecompose,andthedisadvantagesoftheoriginalones,suchasabortdecompositionbecauseofmisjudgmentorcomplexitybecauseofmanytimesdecompositionwereovercome.Meanwhile,theproblemthatthethresholdwashardtodeterminewasalsosolved.Simulationresultsshowthatcomparedwiththeoriginalalgorithm,themodifiedonehasabetterperformancewithlesscomplexity.Finally,thesimulationsignalandin-orbitsatellitedatawasprocessedwiththemodifiedalgorithm.Resultsshowthattheaccuracyofthedifferencephaseofthesimulationsignalisimprovedbyabout3timesandtheaccuracyofthein-orbitsatellitedataisimprovedby0.72times.

Key words: Telemetry,tracking &, commandsignal, Un-decimatedwaveletpackettransform, Powerflatness, SNRimprovement, Cross-correlationcoefficient, Differencephase, Spacetelemetrytracking&command