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[1]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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Simulation Experiment on the Aliasing of High Rate GNSS Used for Earthquake Monitoring

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 40 Number of periods: 2017 02 Page number: 186-192 Column: Public date: 2017-04-23

Title:: Simulation Experiment on the Aliasing of High Rate GNSS Used for Earthquake Monitoring

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)

Keywords:: high rate GNSS; sampling rate; aliasing; shake table simulation experiment

CLC:: P315.7

DOI:: -

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.

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