Journal ArticleDOI
Comparison of a GPS-defined global reference frame with ITRF2000
TLDR
In this paper, a linear fit to the full span of data shows agreement between the two frames at the level of 1 −1 and 0 −0.1 −ppb/year.Abstract:
The Global Positioning System is a constellation of 24–28 satellites, which can be used to define a global terrestrial reference frame. Daily offsets between a GPS defined frame and ITRF2000 have been estimated using more than a decade of GPS observations from 1990–2001. A linear fit to the full span of data shows agreement between the two frames at the level of –1 ppb and –0.1 ppb/year for scale, 5 mm and 0 mm/year for the X component of center of mass, –2 mm and –3 mm/year for the Y component, and 4 mm and 6 mm/year for the Z component. GPS is a viable tool for defining the global reference frame either alone, or in combination with other geodetic techniques.read more
Citations
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Journal ArticleDOI
The effect of the second order GPS ionospheric correction on receiver positions
TL;DR: In this paper, the 2nd-order ionospheric term, caused by the Faraday rotation effect induced by the Earth magnetic field, is about 1000 times smaller and usually ignored.
Journal ArticleDOI
Impact of higher‐order ionospheric terms on GPS estimates
Mathias Fritsche,Reinhard Dietrich,Christoph Knöfel,Axel Rülke,Sibylle Vey,Markus Rothacher,Peter Steigenberger +6 more
TL;DR: The modeling of 2nd and 3rd–order ionospheric correction terms is part of the optimized strategy in an ongoing reprocessing project dealing with a global GPS network and spanning the time period from 1994 up to present time.
Journal ArticleDOI
Interseismic strain accumulation and anthropogenic motion in metropolitan Los Angeles
TL;DR: In this paper, a relationship between horizontal and vertical seasonal oscillations of the Santa Ana aquifer was established to infer cumulative horizontal anthropogenic motions from cumulative vertical motions caused by water and oil resource management, and estimate horizontal interseismic velocities corrected for anthropogenic effects.
Journal ArticleDOI
Seasonal and interannual global surface mass variations from multisatellite geodetic data
TL;DR: In this article, the authors used a hybrid estimator after singular value decomposition of the normalized measurement equations with reduced reliance on a priori spectral information to estimate the global surface mass distribution changes in the spherical harmonic domain.
Journal ArticleDOI
Large-scale global surface mass variations inferred from GPS measurements of load-induced deformation
TL;DR: In this paper, GPS inverted seasonal geocenter and low degree zonal harmonics converge to those determined by measurements from satellite laser ranging (SLR), and significant n > 1 and non-zonal variations have also been found.
References
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Journal ArticleDOI
Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions
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Precise point positioning for the efficient and robust analysis of GPS data from large networks
TL;DR: This work determines precise GPS satellite positions and clock corrections from a globally distributed network of GPS receivers, and analysis of data from hundreds to thousands of sites every day with 40-Mflop computers yields results comparable in quality to the simultaneous analysis of all data.
Journal ArticleDOI
Global mapping functions for the atmosphere delay at radio wavelengths
TL;DR: In this article, the authors developed expressions for calculating the ratios (mapping functions) of the "line of sight" hydrostatic and wet atmospheric path delays to their corresponding zenith delays at radio wavelengths for elevation angles down to 3°.
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Anatomy of apparent seasonal variations from GPS‐derived site position time series
TL;DR: In this paper, the authors derived seasonal site position variations from 4.5 years of global continuous GPS time series and explored through the "peering" approach, showing that 40% of the power of the observed annual vertical variations in site positions can be explained by the joint contribution of seasonal surface mass redistributions.
Anatomy of apparent seasonal variations from GPS derived site position time series
TL;DR: In this article, the authors derived seasonal site position variations from 4.5 years of global continuous GPS time series and explored through the "peering" approach, showing that 40% of the power of the observed annual vertical variations in site positions can be explained by the joint contribution of seasonal surface mass redistributions.