【摘要】 高频GNSS数据实时精密单点定位(RTPPP)可实时获得地表瞬时动态形变和地震波信号,为地震参数快速确定、地震快速响应及海啸预警提供实时的观测资料.本文构建了实时GNSS地震仪系统,主要包括RTPPP和实时探测两部分.利用RTPPP方法处理了模拟的震动实验平台实验数据和2010年Baja California地震的数据,并与惯导(IMU)、事后PPP和差分相对定位结果比较,定量评估了实时GNSS地震仪系统的精度.结果表明,该系统可实现水平方向优于1cm,高程方向优于3cm的实时定位,且对Baja California地震的实时探测结果与南加州地震数据中心公布的结果相一致.更多还原

【Abstract】 Real-time high-rate GNSS data can be used to obtain the dynamic ground displacements caused by earthquakes.The displacements are greatly useful in earthquake early warning and emergency response.A real-time GNSS seismometer system is built with real-time precise point positioning(RTPPP) and displacement waveforms detection techniques.In order to evaluate the accuracy of real-time displacement waveforms derived from RTPPP,simulated data from a shaking table platform,which can generate the dynamic displacements,and real-world data of the 2010 Baja California earthquake are processed.Comparing the above results with those of Inertial Measurement Unit(IMU),precise point positioning(PPP) and relative positioning,it is illustrated that the real-time GNSS seismometer system is able to obtain the displacement waveforms with the accuracy of better than 1 cm and 3 cm in horizontal component and vertical component,respectively.The displacement waveforms of Baja California earthquake detected by this GNSS seismometer system are consistent with the results released by Southern California Earthquake Data Center(SCEDC).更多还原