Accuracy analysis of BDS and GPS baseline processing of GNSS observation network in coastal tide gauge station
In order to evaluate the reliability and accuracy of the BeiDou Satellite Navigation System(BDS)for the settlement monitoring of tidal stations,this paper uses the GPS and BDS observation data of 8 tidal stations in the coastal area of Beihai in 2022 to compare and analyze the GPS and BDS solution results from the aspects of baseline solution standard root mean square error,baseline repeatability and GPS and BDS baseline difference.The results show that the NRMS values of BDS baseline solutions are between 0.17 and 0.25,and the NRMS values of GPS baseline solutions are between 0.18 and 0.23.The NRMS values of the two baseline solutions are basically the same.The length of the GPS baseline solution and the average value of the baseline repetition rate of each component are smaller than that of BDS.From the fixed error and proportional error of the GNSS network,the repeatability accuracy of the baseline length of GPS and BDS reaches the order of 10-8～10-9,the repeatability of the east-west and north-south components of the baseline reaches the order of 10-9,and the repeatability accuracy of the vertical component of the baseline reaches the order of 10-7～10-8.In terms of the difference between GPS and BDS baseline results,the baseline length obtained by GPS is greater than that of BDS,and the average difference between the two is 10.7 mm.The difference of east-west component is the smallest,followed by north-south component,and the difference of vertical component is the largest.The average difference of north-south component,east-west component and vertical component is-8.5 mm,-3.7 mm and 10.6 mm,respectively.The maximum average values of the north-south component,the east-west component,the vertical component and the length difference are 23.6 mm,20.9 mm,30.4 mm and 22.1 mm,respectively.In general,there are some differences between BDS baseline and GPS baseline results,but the difference is not large.Compared with the baseline length,the difference between the two is in the order of 10-8,which can meet the requirements of long sequence high-precision data and can be used for tide station settlement monitoring.
万方数据
维普
