Influences of Wind-up on Data Preprocessing in Real-time Dynamic PPP

Melbourne-Wubbena(MW) and Geometry-Free(GF) combinations are usually used for cycleslip detection in real-time dynamic PPP,but wind-up error caused by the rotating of receiver's antenna,is usually ignored.We discuss the influences of wind-up error on MW and GF combinations.The analysis and experimental results show that wind-up error has no influence on MW combinations while it will affect GF combinations.Sometimes it may even cause a false cycle-slip detection by using GF combinations.Considering the influences of wind-up error on GF combinations,this essay proposes that with both undifferenced GF combinations and the differenced combinations between satellites a new method can be sused to detect the cycle-slip in real-time dynamic PPP and it shows the new method can successfully eliminate the effect of wind-up error.