Atmosphere models Sample Clauses

Atmosphere models. While passing the GNSS signals through the atmosphere there are generated relatively large inaccuracies in determining position. Ionospheric and tropospheric errors are caused by changes in velocity of propagation through the atmosphere. Ionospheric refraction can be eliminated by measuring at two frequencies, because the passage of the signal through ionosphere is frequency-dependent. Passing GNSS signals through the troposphere resulting signal variations due to changes in temperature, pressure and humidity. D4.1 Draft KPIs, test specification and methodology Tropospheric and ionospheric refraction can be modeled quite accurately and in detail. There can be set different widths for different layers of satellite position, there can be also set different rates of dry gas, parameters. which reflects the signal or can modify humidity and other It must be said; however, that simulation of these effects on the signal is very complex and requires a fairly deep knowledge of the subject. Currently, this method GNSS signal is not widely used. of influencing the