Study on the GNSS Deformation Monitoring of Dam Considering the Multipath Error Correction
Bin Yuan · 2016
According to that GPS multipath error cycle is about one sidereal day,correction model can be established to correct multipath error by coordinate domain filtering or observation domain filtering in GPS short baseline relative positioning. BDS is composed of three types of satellites,which are GEO,IGSO and MEO. Because MEO satellites have about seven sidereal days of orbital repeat period,which is very different from GEO and IGSO satellites ' approximate one sidereal day of orbital repeat period,multipath error correction of BDS observation can be corrected only through observation domain filtering. This paper gave an example of deformation monitoring network of one reservoir dam. According to those satellites' different orbital repeat periods,multipath error correction models are established individually for GPS and BDS satellites to correct their multipath error. The results show that the precision of deformation monitoring of dam can be improved distinctively after multipath error was corrected.