| 地电磁辐射宽频域采样观测方法 |
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| 引用本文： | 戚克军,赵绪新,林金铭,胡国庆,蒋幼华.地电磁辐射宽频域采样观测方法[J].大地测量与地球动力学,1997(2). |
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| 作者姓名： | 戚克军 赵绪新 林金铭 胡国庆 蒋幼华 |
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| 作者单位： | 华中理工大学，国家地震局地震研究所 |
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| 摘 要： | 目前地电磁辐射的点频或有限多点频观测方法存在事件漏测和测量结果缺乏精细度等问题，而宽频带快速时域采样又会带来数据存贮容量、数据处理和管理以及系统成本等一系列问题。针对这种情况，为克服点频测量的局限性，研究了一种与信号相位无关的正交锁定频域采样的地电磁辐射谱观测方法，并给出了相应的系统硬件实现结构。这种方法在一次地电磁辐射过程中谱特性不变或某一谱分量持续时间不小于扫描周期的情况下，能准确地测量信号的谱特性并且不存在漏频现象
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| 关 键 词： | 电磁辐射 地震前兆 频域采样 |
FREQUENCY DORMAIN SAMPLING METHODS FOR MONITORING EARTH ELECTROMAGNETIC RADIATION |
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| Qi Kejun,Zhao Xuxin and Lin Jinmin.FREQUENCY DORMAIN SAMPLING METHODS FOR MONITORING EARTH ELECTROMAGNETIC RADIATION[J].Journal of Geodesy and Geodynamics,1997(2). |
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| Authors: | Qi Kejun Zhao Xuxin and Lin Jinmin |
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| Abstract: | Earth Electromagnetic radiation,as an important shock-warning signal, has been monitored by adopting point-frequency or several point-frequencies detection currently. But this technology has the limits that radiation event may be ignored due to non-covered band (s) and that the spectrum is not easy to understand. Therefore, a wide band scanning method is given to solve the problems. Accordingly, principle of sampling in frequency dormain is described and then a quadrature lock-in detection method is discussed to overcome the effect of signals phase non-uniformity. Finally, a practicable system configuration is presented. |
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| Keywords: | electromagnetic radiation earthquake precursor sampling in frequency dormain |
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