Application of zoom FFT technique to detecting EM signal of SLF/ELF

Discrete fast Fourier transform （FFT） has been widely applied to signal spectral analysis and can figure out the entire bandwidth spectrum of a signal. However, the fine structure of high resolution spectrum in a narrow bandwidth is required in some applications. If regular FFT is still used to figu...

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Bibliographic Details
Published inActa seismologica sinica Vol. 20; no. 1; pp. 63 - 70
Main Author 王兰炜 赵家骝 王子影 庞丽娜
Format Journal Article
LanguageEnglish
Published Beijing Springer Nature B.V 2007
Subjects
Bandwidth
EM信号
FFT
Fine structure
Fourier transforms
High resolution
Modulation
Seismic engineering
Seismic phenomena
SLF／ELF
Spectra
Spectral analysis
信号谱分析
傅里叶变换
观测技术
Online AccessGet full text
ISSN1000-9116
1674-4519
1993-1344
1867-8777
DOI10.1007/s11589-007-0063-6

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Summary:Discrete fast Fourier transform （FFT） has been widely applied to signal spectral analysis and can figure out the entire bandwidth spectrum of a signal. However, the fine structure of high resolution spectrum in a narrow bandwidth is required in some applications. If regular FFT is still used to figure out the high resolution spectrum, it will result in addition of data and at last sharply increase of computation and storage. Therefore, FFT is inefficient and a new method must be put forward. In the paper, the principle of zoom FFT technique based on complex modulation, its application to development of SLF/ELF receiver and how to obtain high resolution spectrum using the new technique are introduced in detail and also the theoretical and test results are presented.
Bibliography:FFT
spectrum
11-2022/P
SLF/ELF; FFT; zoom FFT technique; spectrum
P315.61
SLF/ELF
zoom FFT technique
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ObjectType-Article-1
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ISSN:1000-9116
1674-4519
1993-1344
1867-8777
DOI:10.1007/s11589-007-0063-6