| Application of zoom FFT technique to detecting EM signal of SLF/ELF |
| |
| 作者姓名： | 王兰炜 赵家骝 王子影 庞丽娜 |
| |
| 作者单位： | Institue of Crustal and Dynamics China Earthquake Administration Beijing 100085 China，Institue of Earthquake Science China Earthquake Administration Beijing 100036 China，Institue of Crustal and Dynamics China Earthquake Administration Beijing 100085 China，China Earthquake Networks Center Beijing 100036 China |
| |
| 基金项目： | “The Study of ELF Receiver” from Ministry of Science and Technology (2001BA601B03-01-03). |
| |
| 摘 要： | Introduction EM technique of artificial SLF/ELF (Super low frequency/extremely low frequency, their frequency ranges from 0.1 to 300 Hz) can be used to investigate crustal conductivity structure. The SLF/ELF artificial signal is very stable and transmitte…
|
| 关 键 词： | EM信号 观测技术 傅里叶变换 信号谱分析 SLF／ELF FFT |
| 文章编号： | 1000-9116（2007）01-0063-08 |
| 收稿时间： | 2006-06-01 |
| 修稿时间： | 2006-11-14 |
Application of zoom FFT technique to detecting EM signal of SLF/ELF |
| |
| Wang Lan-wei , Zhao Jia-liu , Wang Zi-ying and Pang Li-na.Application of zoom FFT technique to detecting EM signal of SLF/ELF[J].Acta Seismologica Sinica(English Edition),2007,20(1):63-70. |
| |
| Authors: | Wang Lan-wei Zhao Jia-liu Wang Zi-ying and Pang Li-na |
| |
| Institution: | (1) Institute of Crustal and Dynamics, China Earthquake Administration, Beijing, 100085, China;(2) Institue of Earthquake Science, China Earthquake Administration, Beijing, 100036, China;(3) China Earthquake Networks Center, Beijing, 100036, China |
| |
| Abstract: | 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 band- width 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 modula- tion, 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. |
| |
| Keywords: | SLF/ELF FFT zoom FFT technique spectrum |
| 本文献已被 CNKI 维普 SpringerLink 等数据库收录！ |
