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| Titel |
High-rate precise point positioning (PPP) to measure seismic wave motions: An experimental comparison of GPS PPP with inertial measurement units |
| VerfasserIn |
Peiliang Xu, Chuang Shi, Rongxin Fang, Jingnan Liu, Xiaoji Niu, Quan Zhang, Takashi Yanagidani |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250075064
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| Zusammenfassung |
| High-rate GPS has been widely used to construct displacement waveforms and to invert for
source parameters of earthquakes. Almost all works on internal and external evaluation of
high-rate GPS accuracy are based on GPS relative positioning. We build an experimental
platform to externally evaluate the accuracy of 50 Hz PPP displacement waveforms. Since the
shake table allows motion in any of six degrees of freedom, we install an inertial
measurement unit (IMU) to measure the attitude of the platform and transform the IMU
displacements into the GPS coordinate system. The experimental results have shown that
high-rate PPP can produce absolute horizontal displacement waveforms at the accuracy of 2
to 4 millimeters and absolute vertical displacement waveforms at the sub-centimeter
level of accuracy within a short period of time. The significance of the experiments
indicates that high-rate PPP is capable of detecting absolute seismic displacement
waveforms at the same high accuracy as GPS relative positioning techniques but requires
no fixed datum station. We have also found a small scaling error of IMU and a
small time offset of misalignment between high-rate PPP and IMU displacement
waveforms by comparing the amplitudes of and cross-correlating both the displacement
waveforms.
For more details on this talk, one can now get access to the on-line-first version of our
Journal of Geodesy paper:
J Geod, DOI 10.1007/s00190-012-0606-z |
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