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22. Calculation of the ground wave field over inhomogeneous radio paths.

Author

Dembelov, Mikhail G., Bashkuev, Yuri B., Melchinov, Viktor P., Grigor'ev, Yuri M., Popov, Sergey V., and Sharin, Egor P.

Subjects
*SURFACE of the earth, *WAVE functions, *IONOSPHERE
Abstract

The field of the ground wave is considered, which is created by a vertical electric dipole over a inhomogeneous Earth's surface. The ground wave field is of interest at distances when the influence of the waves reflected from the ionosphere on the field can be neglected. For long radio paths with relatively "poor" conductivity, it is proposed to calculate the attenuation function of the ground wave field using the Kalinin-Feinberg's formula for electrically inhomogeneous radio paths. At the initial homogeneous section of the path, the attenuation function is calculated from the model of the "flat" surface of the Earth using Sommerfeld's formulas. [ABSTRACT FROM AUTHOR]

Published
2020
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36. The determination of atmospheric water content from meteorological and gps data

Author

LUKHNEVA OLGA F., DEMBELOV MIKHAIL G., and LUKHNEV ANDREI V.

Subjects
GPS,REMOTE SENSING,METEOROLOGICAL DATA,TROPOSPHERE,TROPOSPHERIC ZENITH DELAY,MOISTURE CONTENT OF TROPOSPHERE,PRECIPITABLE WATER,ДИСТАНЦИОННОЕ ЗОНДИРОВАНИЕ,МЕТЕОРОЛОГИЧЕСКИЕ ДАННЫЕ,ТРОПОСФЕРА,ТРОПОСФЕРНАЯ ЗЕНИТНАЯ ЗАДЕРЖКА,ВЛАГОСОДЕРЖАНИЕ ТРОПОСФЕРЫ,ОСАЖДАЕМАЯ ВОДА
Abstract

The Global Positioning System (GPS) based on satellites and the networks of dual frequency receivers are actively used for geodetic and geophysical applications, as well as for studying the ionosphere and troposphere. The atmospheric water content is in the focus of research as a key parameter for determining of the accuracy of weather forecasting and hydrological monitoring. The precision of atmospheric water content calculations depends on the accuracy of determination of the delays of signals propagating from GPS satellites to ground-based GPS receivers when geodynamic measurements are conducted. This paper describes a technique that allows us to estimate the integrated water vapor (IWV) in the atmosphere from measurements of GPS satellite signal delays. We consider remote sensing of the lower atmosphere by GPS measurements to detect the water vapor content in the conventional vertical column to the top level of the troposphere (up to 12 km above the Earth's surface). In studies of the propagation of signals from GPS satellites to ground receivers, the atmospheric water vapor is taken into account as a ‘wet’ component (ZWD) of the zenith tropospheric delay (ZTD). ZTD is the sum of ZHD (hydrostatic or ‘dry’ delay) and ZWD (‘wet’ delay). ZWD values can be converted with a very high confidence in integrated water vapor (IWV) values for each installed GPS receiver.

Published
2016

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