Discussion on high-precision ZTD estimation method in Antarctica
In order to further improve the monitoring accuracy of ice and snow cover change in Antarctica,the paper discussed on the high precision estimation method of zenith tropospheric delay(ZTD)in Antarctica:based on the BDS-3 global navigation satellite system(BDS-3),double difference(DD)method and precise single point positioning(PPP)method were used to perform the high-precise estimation for the multi-global navigation satellite system(GNSS)experiment(MGEX)stations in Antarctica;then,the ZTD values estimated by the two methods were compared with the ZTD products published by the International GNSS Service(IGS)Analysis Center,and the accuracy of the ZTD values estimated by the two methods was comprehensively evaluated.Experimental results showed that the proposed methods could both reach millimeter-level accuracy in estimating ZTD values of MGEX stations in Antarctica,among them,DD network method would have higher accuracy in estimating ZTD values of MGEX stations,but with less timeliness and independence,while PPP method would be more timeliness and independence.
BeiDou-3 global navigation satellite system(BDS-3)double difference(DD)precise point positioning(PPP)zenith tropospheric delay(ZTD)
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