References of "Sasagawa, G"
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See detailA detailed analysis of tropospheric effects on geodetic observations at TMGO
Schenewerk, M.; van Dam, Tonie UL; Sasagawa, G. et al

in Physics and chemistry of the earth (1998), 23(1), 103-106

Improvements in geodetic tools are making previously subtle effects significant. Two examples affecting GPS observations are atmospheric loading of the Earth's crust and the tropospheric delays ... [more ▼]

Improvements in geodetic tools are making previously subtle effects significant. Two examples affecting GPS observations are atmospheric loading of the Earth's crust and the tropospheric delays, specifically the wet component. Each measurement, tropospheric delays and site coordinates, requires unambiguous determination of the other to achieve the highest accuracy. Table Mountain Geophysical Observatory (TMGO) is a unique site where a long history of observations from two complementary techniques, GPS and superconducting gravimetry, have been accrued. In particular, the superconducting gravity measurements provide a unique baseline for evaluating GPS vertical estimates over a variety of time frames. Positional estimates for TMGO using these techniques will be compared. Tropospheric effects will be identified and discussed. The ability for GPS to make subdaily, daily, and long term vertical estimates will be evaluated. [less ▲]

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See detailCalibration of a superconducting gravimeter by comparison with an absolute gravimeter FG5 in Boulder
Francis, Olivier UL; Niebauer, T. M.; Sasagawa, G. et al

in Geophysical Research Letters (1998), 25(7), 1075-1078

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See detailAnalysis of data from the 1994 international comparison of absolute gravimeters with a single computational protocol
Sasagawa, G.; Klopping, F.; van Dam, Tonie UL

in Metrologia (1995), 32

Data from the 1994 International Comparison of Absolute Gravimeters were processed with the National Oceanic and Atmospheric Administration (NOAA) Geosciences Lab protocols and processing algorithms. The ... [more ▼]

Data from the 1994 International Comparison of Absolute Gravimeters were processed with the National Oceanic and Atmospheric Administration (NOAA) Geosciences Lab protocols and processing algorithms. The rootmean-square discrepancy between results obtained from individual groups and the NOAA processing is 2,3 μGal; the average discrepancy is 1,5 μGal. The sources of the discrepancies are probably (i) differences in the vertical gradients used for datum level transfers, (ii) inconsistencies between processing algorithms, and (iii) differences in data editing criteria. [less ▲]

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