GNSS-виміри

Accuracy estimation of the components of zenith tropospheric delay determined by the radio sounding data and by the GNSS measurements at Praha-libus and GOPE stations

The aim of this work is to evaluate the accuracy of determining the wet component of zenith tropospheric delay (ZTD) from GNSS-measurements and the accuracy of determining the hydrostatic component according to the Saastamoinen model in comparison with the radio sounding data as well. Zenith tropospheric delay is determined mainly by two methods - traditional, using radio sounding or using atmospheric models, such as the Saastamoinen model, and the method of GNSS measurements.

Comparison of the wet component of zenith tropospheric delay derived from GNSS observations with corresponding value from radio soundings

The purpose of this paper is to evaluate an accuracy of the wet component of zenith tropospheric delay obtained by the data of six GNSS stations in comparison with radio sounding data. The determination of hydrostatic and wet components of zenith tropospheric delay was divided into several stages. In the first phase, with an appropriate site for data center processing GNNS-measurements averaged values of zenith tropospheric delay were selected.

The determination and procedure transformation of the ionosphere parameters with GNSS-observations

Purpose. Solutions to the problems of coordinate-time provision based on continuous GNSS-observations is based on the processing of large data sets of code and phase measurements. One of the possible additional options for conducting this study is computation of the numerical characteristics of the ionospheric impact on the signals distribution from the satellites – the values of the total electron density (TEC). These characteristics reflect the dynamics of the atmosphere ionization that is important in terms of monitoring the circumterrestrial space.