Evaluation of the 1984 Alaska Global Positioning System campaign with the Bernese GPS Software

Beutler, G.; Bauersima, I.; Gurtner, W.; Rothacher, M.; Schildknecht, T.; Mader, Gerald L.; Abell, Michael D.

doi:10.1029/jb092ib02p01295

Cited by 50 publications

(17 citation statements)

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“…This generally includes orbit modeling, fidudal station coordinate errors, and tropospheric effects on GPS orbit accuracy. The b parameter can be considered to be largely a geometric effect (Beutler et al, 1987) :…”

Section: Experiments and Resultsmentioning

confidence: 99%

GPS relative positioning at a precision level of one part per billion

Andersen

Hauge

Kristiansen

1993

Bulletin Géodésique

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A b s t r a c t . Six days of data from the GIG'91 experiment have been analyzed with a fiducial strategy. The results obtained with our orbital software GEOSAT, show daily horizontal and length repeatabilities at the level of 1 part in 109 plus 2 mm for baseline lengths up to 4000 kin. A direct comparison with results from the GIPSY software shows, with some exceptions, mean differences at the sub-cm level. After transformation to ITRF'90 the rms of the coordinate differences is 14.8 ram. Studies of orbital predictions and comparisons with external high precision orbits indicate a mean orbit precision and accuracy of around 35 cm in each cartesian coordinate. Correlations between the GEOSAT and GIPSY solutions indicate some common model deficiencies.

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Section: Experiments and Resultsmentioning

confidence: 99%

GPS relative positioning at a precision level of one part per billion

Andersen

Hauge

Kristiansen

1993

Bulletin Géodésique

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“…Farther from the dam, the deformation is too small to be detectable. For example, at the closest regional IGS (International GPS Service) [Beutler et al, 1987] stations at distances of a few hundred km and longer (Wuhan, Shesan, Kunming and Lhasa), the induced surface displacements are smaller than 10 À2 mm/yr, far below the accuracy of the sensitivity of GPS. Figure 5 gives the horizontal north-south deformation at the three epochs; the corresponding east-west deformation (not shown) is similar but having the E-W pattern.…”

Section: Resultsmentioning

confidence: 99%

Time‐variable gravity signal during the water impoundment of China's Three‐Gorges Reservoir

Boy

Chao

2002

Geophysical Research Letters

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Beginning in 2003, China's Three‐Gorges Reservoir will start water impoundment in phases. By 2009, it will be holding 40 km3 of water, flooding a stretch of middle Yangtze River about 600 km in length. The water impoundment process represents a geophysical “controlled experiment” offering a unique opportunity for detailed studies of a classical forward/inverse modeling problem of surface loading. While Wang [2000] studied the large loading effects on a local scale, we aim for longer spatial scales upwards from several hundred km, specially on the time‐variable gravity signals that can be detected by the newly‐launched GRACE satellite mission, whose 5‐year lifetime (until 2007) will span the major impoundment period. Our results using the Green's function method adopting the PREM elastic Earth model indicate that the per‐year geoid height increase is above the GRACE observational sensitivity out to harmonic degree 20, and to degree 50 (corresponding to a wavelength of 800 km) when integrated over the 5‐year period.

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“…Precise geodetic measurements with the Global Positioning System are now possible that allow determination of plate motion and crustal deformation rates within a short (several year) time span [e.g., Beutler et al, 1987; Tra! !i and Dixon, 1988;Dong and Bock, 1989].…”

Section: Introductionmentioning

confidence: 99%