[SGD02-P02] Reference frame bias in the F3 solution of GEONET
Keywords:GNSS, Reference Frame, GEONET
In some parameters, there is discontinuity between 2002 and 2003 because there are larger offsets in PPP coordinates that is caused by antenna change. This means that PPP is more sensitive to Phase Center Variation (PCV) correction than relative positioning. After 2004, scale parameter indicates a systematic bias of 2~3 ppb, which means that the F3 network is defined a little larger than its actual shape. Furthermore, 3 parameters of translation show that F3 network is deviated by 2~7 cm from the true position. Difference between F3 and our PPP coordinates suggests that vertical component mainly contributes to these bias of the reference frame. A major error source in the vertical component is considered to be the tropospheric delay, and difference of tropospheric delay of F3 and our PPP solution is correlated with that of coordinates.