【摘 要】
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High-rate GNSS plays an important role inmonitoring the process of strong ground motion,such as seismic activity.To achieve real-time monitoring,a reasonablesol
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High-rate GNSS plays an important role inmonitoring the process of strong ground motion,such as seismic activity.To achieve real-time monitoring,a reasonablesolution and filtering method are needed,especially for the 50Hz data.Based on the analysis of differential and combination method,effects of ionosphere and troposphere have obvious trend within a short time,butcannot be treated as linear trendcompletely.To monitor real time surface deformation accurately,a newly developed strategy is proposed in this paper,it can effectivelyreduceatmospheric error of double-difference in real-time.50Hz data are obtained during Lushan earthquake (Ms7.0),Sichuan,China;the coseismic deformationsare captured successfully on the sites of CORS stations.With 3D grid searching method,the obtained earthquake focus is basically consistent with USGS published results.It shows that the proposed method is effective and reasonable for strong ground motionmonitoring by using high-rate GNSSobservations,especially for seismic activity.
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