Abstract:We use dynamic precise point positioning technology to process high-rate GNSS data to obtain GNSS displacement, and use the spatial superposition filtering method to eliminate the influence of its common mode error. The baseline drift of the strong seismograph acceleration is corrected by fusing the high-rate GNSS displacement and acceleration based on Kalman filtering, and we establish a combined model of high-rate GNSS and strong seismograph considering the correction of baseline deviation. Taking the M6.0 earthquake in northern Italy in 2016 as an example, we analyze the effectiveness of the model in this paper. The experimental results show that the method has the characteristics of high precision and wide frequency band. It can accurately describe the permanent step caused by the earthquake and the surface displacement change.