电子科技
電子科技
전자과기
IT AGE
2011年
11期
9-12,15
,共5页
低频电磁信号%频率细化%频谱%复调制细化
低頻電磁信號%頻率細化%頻譜%複調製細化
저빈전자신호%빈솔세화%빈보%복조제세화
low frequency electromagnetic signal%frequency refinement%spectrum%polyphonic system refinement
在低频电磁信号中,为了得到某一个窄带内频谱的精细结构,提高频谱的频率分辨率,满足良好的实时性要求,文中提出了基于快速傅里叶变换算法的频率细化技术。通过复调制频率细化,将某一局部频谱放大,以便对低频电磁信号的频谱进行快速、准确的分析。利用复调制频率细化方法,对低频电磁信号进行Matlab仿真,其仿真结果表明,该方法比线性调频Z变换算法更有效、可行。
在低頻電磁信號中,為瞭得到某一箇窄帶內頻譜的精細結構,提高頻譜的頻率分辨率,滿足良好的實時性要求,文中提齣瞭基于快速傅裏葉變換算法的頻率細化技術。通過複調製頻率細化,將某一跼部頻譜放大,以便對低頻電磁信號的頻譜進行快速、準確的分析。利用複調製頻率細化方法,對低頻電磁信號進行Matlab倣真,其倣真結果錶明,該方法比線性調頻Z變換算法更有效、可行。
재저빈전자신호중,위료득도모일개착대내빈보적정세결구,제고빈보적빈솔분변솔,만족량호적실시성요구,문중제출료기우쾌속부리협변환산법적빈솔세화기술。통과복조제빈솔세화,장모일국부빈보방대,이편대저빈전자신호적빈보진행쾌속、준학적분석。이용복조제빈솔세화방법,대저빈전자신호진행Matlab방진,기방진결과표명,해방법비선성조빈Z변환산법경유효、가행。
In the low frequency electromagnetic signal,in order to get the fine structure of a certain spectrum within the narrowband,improve the frequency resolution of spectrum,and meet the requirement of good real-timeness,this paper puts forward the frequency refining technology based on the fast Fourier transform algorithm.Through polyphonic system frequency refinement,we amplify a local spectrum to facilitate fast and accurate analysis for the low frequency electromagnetic signal spectrum.Matlab is used for simulation of the low frequency electromagnetic signal by the method of polyphonic system frequency refinement.The simulation results show that this method is more effective and feasible than the Chirp Z transformation algorithm.
