一种组合算法在随钻电磁波信号解调中的应用

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中图分类号：TN911.72-34 文献标识码：A 文章编号：1004-373X（2025）15-0064-07

Applicationofcombinationalgorithmindemodulationof electromagnetic wave signals whiling drilling

HEWei，LUJianxun （SchoolofPhysicsandElectronicEngineering，SichuanNormalUniversity，Chengdu 61Olol，China）

Abstract：Inelectromagneticmeasurementwhiledriling （EM-MWD），thetraditionalcoherentdemodulationmethodshave highbiterrorrate（BER）duetosignalatenuationandnoiseinterference，whichresultsininaccuratedatadecoding.Toolvetis problem，amethodcombiningafiniteimpulseresponse（FIR）filteringalgorithmandanadaptivefilteringalgorithmisdesigned withtheaimof improvingtheacuracyofdemodulation.Inthemethod，theout-of-bandnoiseisremovedbytheFIRfiltering algorithm，andthenthefileredsignalisfedintotwoadaptiveflterswithdferentreferencesignals.Theoutputsignalsof the twofltersarecomparedforjudgment，therebyobtainingthedecodeddata.Inordertoverifytheefectivenessoftheproposed method，theelectromagneticwavecommunicationprocessundertwodiferentnoiseconditionsissimulatedwithsimulation software.Thesimulationresultsindicatethat，incomparisonwiththetraditionalcoherentdemodulationmethod，inaGaussian whitenoiseenvironment，whenthebaudrateis2b/s，temethodachievesanapproximate1dBimprovementinsignal-tooise ratio （SNR）withlitledferenceinBER.AtabaudrateofO.5b/s，itsSNRisenhancedbyabout6dB，anditsBERisreduced byapproximately 8% . Inthe field noise environment，theBERof thecombinedalgorithmisloweredbyabout 4% .Therefore， underthe same SNR，the proposed method can reduce the BER significantly，demonstratingsuperiordemodulation performance.

KeyWords：EM-MWD; MWD;FSK information; modulation demodulation; FIR filtering; adaptive algorithm

0 引言

目前，在随钻测量过程中，主要有两种传输方式，即泥浆脉冲随钻测量系统和电磁波随钻测量（Electromag-neticMeasurementWhileDrilling，EM-MWD）系统。（剩余7236字）