In this paper, we discuss the estimating errors possibilities of positioning and time determinations arising from navigation signals delays of Global Navigation Satellites Systems in the Earth atmospheric layers (ionosphere and troposphere). The software ModBis24 imitate navigation signals system GLONASS. The ModBis24 is used to obtain quantitative estimates of the tropospheric and ionospheric delays and to plan optimally sessions for accuracy positioning and time determinations GNSS service users.
In the article, based on the results of assessing, the magnitude of the mutual correlation between variations in the speed of Earth rotation and the change in global temperature over the period from 1900 to 2015 the forecast of variations in the Earth's rotation speed and its temperature for a period of up to 20 years is given. The main parameter for building a prediction model is the speed of Earth rotation. It is shown that the observed global warming from the mid-20s of the current 100th anniversary is likely to enter the long cooling phase.
Step-by-step schemes of adaptive unscented Kalman algorithm used for the software development is given. The solution to the problem of solar radiation parameters estimation based on the quasimaximum likelihood method and the adaptive unscented Kalman filter is shown. The parameters of the solar radiation were estimated taking into account different illumination zones. This made it possible to significantly improve the quality of predicting the trajectory of the navigation satellite.
The paper deals with current problems of measuring the parameters of the Earth rotation, i.e. location of the Earth in space. Results of determination of the Earth rotation parameters by optical techniques, satellite laser ranging and GLONASS/GPS satellite navigation systems are presented. Design of the nano- and picosecond emitters for laser ranging devices of 2nd and 3rd generation and representation of tracking results are described in detail.