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- W116906332 abstract "Using a GPS receiver as a seismometer was first proposedin 1994. Recent GPS seismometer experiments,with GPS Real-Time Kinematic (RTK) systems, havedemonstrated very encouraging results. However, severalimplementing issues have to be investigated before theconcept of a GPS seismometer is feasible.In order to design the layout of reference and stations for distant seismic events, a configuration consisting of a reference station in the center of a ring formed by a few stations is proposed. For seismic events local to the ring (within the rover ring), combined processing of moving baseline RTK and DGPS positioning can be a so-lution. To test the possibility of noise reduction using measure-ments from adjacent days, two Trimble MS750 GPS re-ceivers were connected with a null modem to collect data at 20Hz rate at UNSW for about 3 hours, everyday on 5 successive days. By using an adaptive filter in processing the various combinations of the RTK time series, it has been shown that the noise can be reduced significantly. A zero-baseline test at 10Hz sampling rate with two Leica CRS1000 GPS receivers indicates that the L1 phase measurements are truly independent, L2 phase measure-ments are partially independent, and pseudo-range meas-urements of P1 and P2 are highly correlated. Since Frame Relay circuits have already been used in some broadband seismic networks, data communication is not such a big problem if using high data rate GPS as seismometer. Discussions on the pros and cons of using GPS as seismometerare presented. In conclusion, it would appearthat a GPS RTK system can be used as a strong motion amplitude seismometer, and would therefore complement current seismometers." @default.
- W116906332 created "2016-06-24" @default.
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- W116906332 date "2000-09-22" @default.
- W116906332 modified "2023-09-24" @default.
- W116906332 title "GPS Seismometers: the Implementing Issues" @default.
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