PPP technique evaluation based its all estimates utilizing CSRS-PPP online service

This paper will address issues related to Precise Point Positioning (PPP) and perform raw observation data analysis to evaluate the specific performance of PPP based its all solutions processed by CSRS-PPP using final precise orbit and clock products from IGS. For this purpose, daily sessions of observations, at 30 seconds intervals, of five different IGS stations are processed using aforementioned approach. The tests show that, the solution accuracy reaches averagely 0.0023 m, -0.0005 m, -0.0035 m for static mode and about 5 cm for kinematic mode, respectively; centimeter convergence is obtained after being processed for 10-20 min, and residuals are nearly close to true-value after 30 min or more longer; tropospheric zenith delay estimates, both for static and kinematic, are greatly consistent with the solutions from IGS, and fluctuate within 5 mm; the residuals for clock offset are approximate to 0.1 ns about 1 h later, and the final values are close to 0 for three stations. It also may be inferred that carrier-phase ambiguity, real or integer, can play a pivotal role in aforementioned solutions.