Abstract:With the modernization of GPS, there are currently 7 Block ⅡR-M satellites and 12 Block ⅡF satellites capable of broadcasting L2C signals, achieving initial operational capability. We process the high-rate data of 27 stations in the IGS network during DOY 1-7 of the year 2016 using precise point positioning (PPP). The improvement of L2C-based over L2P-based ionosphere-free combinations is directly examined in position domain. The experimental results show that the P1/L2C combination observations exhibit 7.4%, 7.4% and 4.4% accuracy improvements in the east, north and up components, respectively, compared to the traditional P1/L2P combination PPP dynamic positioning results. In addition, L2C signals can be stably tracked and do not easily lose lock, which is appreciated for preserving the continuity of satellite observation and for solving ambiguities in PPP data processing.