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- W195259498 abstract "Comparison of simultaneous Global Positioning System (GPS) and water vapor radiometer (WVR) measurements at Goldstone over 82 days in the period between June 25 and October 6, 1996, shows agreement in zenith wet path-delay estimates to <6 mm rms. The level of agreement is consistent with the expected levels of GPS and WVR errors. This method shows considerable promise for improving the accuracy of the water vapor emission model. Future GPS/WVR measurements at a wet site using one additional instrument (a microwave temperature profller) are expected to reduce the uncertainty in this emission model to <2 percent. I. Introduction The Earth’s troposphere causes a refractive delay at microwave frequencies of approximately 7 ns at the zenith, equivalent to an excess path length of 2 m. Any precision phase or delay measurements at microwave frequencies that involve signals propagating between space and the ground must include a means of calibrating the efiect of the troposphere. It is convenient to divide the tropospheric delay into two components: dry and wet. The large majority of the delay (typically‚90 percent) is due to the dry component of the air (mainly nitrogen and oxygen). Because dry air is well mixed, variations in the dry delay mostly are slow and smooth. The refractivity of dry air [1] is almost perfectly proportional to density. Therefore, under the assumption of hydrostatic equilibrium, the dry delay can be derived very simply from the surface pressure, with an uncertainty of …0.5 mm [2]. The contribution from water vapor is less than…40 cm for nearly all locations on Earth at any time. For DSN sites, the average zenith wet delay is»10 cm. However, because the distribution of atmospheric water vapor is highly inhomogeneous, almost all the high-frequency temporal and spatial variability in the total tropospheric path delay at any site is due to variations in wet delay." @default.
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- W195259498 date "1997-04-01" @default.
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- W195259498 title "Comparison of Global Positioning System and Water Vapor Radiometer Wet Tropospheric Delay Estimates" @default.
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