Impact of Second Order Ionosphere Delays for GPS Kinematic Precise Point Positioning Applications

doi:10.11947/j.AGCS.2018.20180299

Abstract

Abstract: In the GPS precise point positioning algorithms, the ionosphere delays were considered as eliminated with ionosphere-free combination. However, the IF combination can only eliminates the first order ionosphere delays and the second order ionosphere (Ion2) delays were actually enlarged. As the Ion2 can affect the observations over centimeters level, the effects on PPP positioning results may not be negligible for centimeters-accuracy applications. In this research, the impacts of Ion2 delays on kinematic precise point positioning applications were calculated with both real and simulated observations. With 21 IGS station observations, the maximum effects of Ion2 delay on positioning result are 0.8 cm on horizontal, and over 2.4 cm on vertical. On the simulation analysis, an 2.5×5 degree global grid observations were simulated with Ion2 delay, and the maximum Ion2 delay can reach up to 3 cm and cause over 7 cm bias on positioning results. Both real and simulated results show that the Ion2 delays affect the positioning results with systematic bias on south direction, which cannot be eliminated with smoothing algorithm. Hence, it concluded that the PPP cannot be neglected the second order ionosphere delays to breakthroughs the accuracy limitation on centimeters level.

Key words: global navigation satellite system(GNSS), ionosphere delay, second order ionosphere delay, kinematic precise point positioning

CLC Number:

P228

ZHANG Shaocheng, WANG Xinzhe, HUANG Longqiang, YIN Fei. Impact of Second Order Ionosphere Delays for GPS Kinematic Precise Point Positioning Applications[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(S0): 45-53.

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