The accuracies of the real-time international GNSS service

The accuracies of the real-time international GNSS service (IGS) Satellite orbits and clocks corrections recently are about 5 and 90 centimeters, respectively IGS,2018. Satellite orbit and clock errors represent a large portion of error budget of the real-time PPP. Therefore, focusing on the precise orbit determination and precise clock estimation will have a great effect on reducing the magnitude of the real-time PPP error budget and consequently the convergence period. So the hypothesis is that with improving the accuracy of determination of satellite orbits and clocks, a large portion the error budget of real-time PPP will be removed, then the solution converges quickly, and consequently the convergence period reduces.