STUDY ON ELIMINATION OF MULTIPATH ERROR IN PPP BASED ON
SIDEREAL FILTERING
1)College of Electronic Science and Engineering,National University of Defense Technology,
Changsha 410073)
2)Jiangnan Institute of Computing Technology,Wuxi 214083
Abstract:Based on PPP mathematic model,the impact of multipath error on PPP solution is investigated.The result of analysis indicates that all positioning parameters,such as solution constant interval and sampling rate,have to be consistent with each other on different observation days in opperating PPP sidereal filtering.Sidereal filtering can be applied to low sampling rate observations by Lagrange interpolation of position error time series,which spreads its application and decreases calculation amount.Experimental result analyzing the data from IGS tracking stations shows that accuracy of PPP kinematic position accuracy can be improved with the sidereal filtering by 692%,72.3% and 27.6% for the East,North and Up components