|本期目录/Table of Contents|

[1]刘刚,聂兆生,贾治革,等.高频GNSS地震监测中频率混叠现象的仿真实验研究*[J].地震研究,2017,40(02):186-192.
　LIU Gang,NIE Zhaosheng,JIA Zhige,et al.Simulation Experiment on the Aliasing of High Rate GNSS Used for Earthquake Monitoring[J].Journal of Seismological Research,2017,40(02):186-192.
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高频GNSS地震监测中频率混叠现象的仿真实验研究*(PDF/HTML)

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:
40
期数:
2017年02期
页码:
186-192
栏目:
出版日期:
2017-04-23

文章信息/Info

Title:
Simulation Experiment on the Aliasing of High Rate GNSS Used for Earthquake Monitoring
作者:
刘刚1; 聂兆生1; 贾治革1; 张锐2; 乔学军1
(1.中国地震局地震研究所 中国地震局地震大地测量重点实验室,湖北 武汉430071; 2.地壳运动监测工程研究中心,北京 100036)
Author(s):
LIU Gang1; NIE Zhaosheng1; JIA Zhige1; ZHANG Rui2; QIAO Xuejun1
(1. Key Laboratory of Earthquake Geodesy,Institute of Seismology,CEA,Wuhan 430071,Hubei,China)(2. National Earthquake Infrastructure Service,Beijing 100036,China)
关键词:
高频GNSS;  采样率;  频率混叠;  振动台仿真实验
Keywords:
high rate GNSS;  sampling rate;  aliasing;  shake table simulation experiment
分类号:
P315.7
DOI:
-
摘要:
利用振动台实验,通过设置多个采样频率监测仿真的正弦波形及天然地震波形,研究高频GNSS出现的频率混叠现象及其时频特征,并讨论合理的规避混叠现象的采样率设置方法。结果表明:混叠效应在时域和频域中均有所体现,混叠频率的幅度若高于GNSS的误差水平,其导致的失真将不能忽略; 震级与震中距是导致混叠现象的主要因素,活动断裂的孕震能力与地震危险性及站点与断层面距离是决定高频GNSS监测站采样频率的重要依据。
Abstract:
High rate GNSS measuring the kinematic displacements caused by earthquake with discrete and equal interval sampling rate. According the Nyquist Law,if analog signals have resolve energy at the frequencies higher than the half of sampling rate,the higher frequency signals masquerading as the low frequency signal in the time and frequency domains will contaminate the sampled data. This effect is called aliasing. In this paper,we investigate the aliasing of high rate GNSS by using shake table tests. First we used the sinusoids as input signals to confirm the aliasing effects in the high rate GNSS. Then we used an acceleration record of real earthquake as the input signal to study the mechanism of aliasing effects in the high rate GNSS.The results show that the aliasing occurs both in time domain and frequency domain,and shows non-negligible effect if the masqueraded amplitude is greater than the uncertainty of GNSS positioning. The earthquake magnitude and epicenter distance of GNSS site are two major factors which determine the amplitude of the aliasing effect. Therefore, sampling rate of GNSS should be set according to the seismogenic ability of monitoring fault and the distances between the fault plane and GNSS sites.

参考文献/References:


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备注/Memo

备注/Memo:
收稿日期:2016-10-28
基金项目:中国地震局地震研究所所长基金(IS201326127、IS201506204)和国家自然科学基金项目(41404016、41504011、41574017、41541029)联合资助.

更新日期/Last Update: 2017-06-10