GLONASS and GPS performance evaluation in IAC is implemented through regular service mode based on the measurements from the global network of stations by self-designed software tools. It provides for regular software update featuring the most advanced processing models and techniques. Many of estimations are obtained using the master data, calculated using "AKVAPAS" software package registered in the State Register under № 46393-11 and authorized for use in the Russian Federation (the certificate of approval for measuring tool type RU.E.27.018. № 42 157).

     The estimations results updated within intervals from 5 minutes to 1 day are available on a special IAC technological web-site. The site is mostly aimed at advanced users qualified in analysis of satellite navigation systems’ performance. Data collection and processing are carried out in automatic mode with occasional operator control due to large amount of data obtained. IAC technological web-site contains the following information:

  • The detailed estimation of orbit and clock information for all GLONASS and GPS satellites over the last month, over the last 3 days (postprocessing), and in near real time mode;
  • The results of accuracy estimation for the IAC posteriori and predictive orbit and clock data used for GNSS performance analysis, also as compared to that performed by foreign centers of analysis;
  • The results of user positioning accuracy estimation based on various measurements (one and two-frequency, code and phase smoothed) with the use of on-board (standard) and posteriori orbit and clock data;
  • Systematic errors estimation results for code-measurements performed by the most common surveying equipment;
  • Results of estimating parameters that determine the potential user positioning accuracy of GLONASS and GPS.

     Every section has its own "Description" tab which contains description of the data provided as well as the calculation techniques. An access to the IAC technological web-site is granted upon preregistration.

IAC technological website: