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时间:2020-03-25
《基于小波变换的无驱动结构微机械陀螺信号自旋频率的提取.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第27卷第7期传感技术学报V01.27No.72014年7月CHINESEJOURNAIOFSENSORSANDACTUATORSJuly2014SpinFrequencyExtractionofNon·-DrivenMicro--MachinedGt~yroscopeSbigna’lvViaWaveletT1ransftolrmZHANGNing,ZHANGFuxue,ZHANGZengping2(1.SensingTechniqueResearchCenter,BeijingInformationScienceandTechnologyUniversity,Beijingt
2、O0101,China;2.ElectronicEngineeringInstitute,BeringPostsandTelecommunicationsUniversity,Beijing100876,China)Abstract:Asanewtypeofgyroscope,itcansensepitch,yawandrollangularvelocityoftherotatingaircraft.Thesensitivesignalisanamplitudemodulatedwavesignal,wherethecarrierfrequencyisthespinfreque
3、ncyandtheen—velopeisthelateralangularvelocity.Consideringthatthespinfrequencyisrequiredtobepreciselyextractedinpracticalapplications,anewmethodthatusingwavelettransformtoconstructanalyticfunctionsisproposedandthealgorithmistheoreticallyderived.Besides,thespinfrequencyofanaloggyroscopeamplitu
4、demodulationwavesignal,whosenoiseratiois30dB,isextractedandtheerrorisfurtheranalyzedthroughMATLAB,wheretherelativeerroris0.0336forHilberttransformand0.0178forwavelettransform.Furthermore,thespinfrequencyofgyroscopesignaltestedinreal-timebythree—axisprecisionturntableisextractedandtheerrorisf
5、urtheranalyzed,wherethelateralangularvelocityis180。/s.ForHilberttransform,therelativeeroris0.0359andtheMSEis7.9159,whileforwavelettransform,therelativeerroris0.0018andtheMSEis0.2937.Theaccuracyofspinfre-queneycalculatedbyWavelettransformistwentytimeshigherthantheHilberttransform,andtheanti—n
6、oiseperformanceandfrequencystabilityisbetter.Keywords:micro—machinedgyroscope;spinfrequency;wavelettransform;HilberttransformEEACC:7230doi:10.3969/j.issn.1004—1699.2014.07.005基于小波变换的无驱动结构微机械陀螺信号自旋频率的提取张宁,张福学,张增平(1.北京信息科技大学传感技术研究中心,北京100101;2.北京邮电大学电子工程学院,北京100876)摘要:针对一种新型陀螺,它能敏感旋转载体的俯仰、偏航和滚
7、转角速度,敏感信号是一种调幅波信号,载波频率是自旋频率,包络是横向角速度。实际应用中,需要精确提取自旋频率。基于此,提出了一种提取载波频率的新的方法——小波变换构造解析函数法,对自旋频率解算算法进行了理论推导,并通过MATLAB软件对噪声比为30dB的模拟陀螺调幅波信号进行了白旋频率的提取和误差分析,其中Hilbert变换相对误差为0.0336,小波变换相对误差为0.0178。对三轴精密转台实时测试的横向角速度为180。/s的陀螺信号进行了自旋频率的提取和误差分析,其中Hilbert变换相对
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