Presenter: You-Chia Lee
Date: 2016/10/06
Abstract
Global positioning system (GPS) has played an important role for the investigation of plate tectonics and crustal deformation. Investigating the noise characteristics of GPS position time series is in order to realize their precision and reliability. GPS solutions were analyzed for noise content using maximum likelihood estimation (MLE). In the analysis the noise was assumed to be white noise only, a combination of white noise plus flicker noise, or a combination of white noise plus random walk noise. For the analysis the spectral index and amplitude of the power law noise were estimated simultaneously with white noise. In solutions the noise can be best described by a combination of white noise plus flicker noise. Estimate noise properties of continuous GPS time series collected on concrete pillar monuments and compare them with data from deep drilled braced monuments that are considered the most stable monuments available. Differences between the monument types are not a dominant influence on these time series, implying that the less expensive concrete pillar monuments are valid choice for recording many signals of geophysical interest.
Reference
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Beavan, J., 2005. Noise Properties of continuous GPS data from concrete pillar geodetic monuments in New Zealand and comparison with data from U.S. deep drilled braced monuments. J. Geophys Res., 110 (B8), B08410. doi:10.1029/2005JB003642.