利用国内iGMAS站的BDS-2+BDS-3精密相对定位研究

Research on BDS-2+BDS-3 precision relative positioning using iGMAS station in China

为验证BDS-2+BDS-3精密相对定位的精度,该文采用国内的国际GNSS监测评估系统(iGMAS)跟踪站实测数据,利用GAMIT10.71软件对BDS-3数据进行高精度相对定位基线解算,结合目前北斗卫星导航系统(BDS)卫星状态和数据质量,与全球定位系统(GPS)数据解算结果进行对比。实验结果可知:在卫星可见数和卫星PDOP值方面,国内测站中BDS-2+BDS-3的表现优于GPS;在数据质量方面,BDS-2+BDS-3数据表现略优于GPS;在基线解算方面,BDS-2+BDS-3的宽巷和窄巷模糊度固定率略低于GPS,解算BDS-2+BDS-3基线长度精度值低于GPS约2 mm,解算各测站三方向精度值BDS-2+BDS-3与GPS都保持在30 mm以内。该文实验结果表明,目前解算BDS-2+BDS-3的精密相对定位精度与GPS精度相差不大,处于较高水平。

In order to verify the accuracy of BDS-3 precision relative positioning,this paper used the measured data of domestic international GNSS monitoring&assessment system(iGMAS)tracking station,and used GAMIT 10.71 software to conduct high-precision relative positioning baseline solution research on BDS-2+BDS-3 data.The current BDS-2+BDS-3 satellite status and data quality were compared with the GPS(global positioning system)data calculation results.The experimental results showed that:in terms of satellite visibility and satellite PDOP value,BDS-2+BDS-3 performed better than GPS in domestic stations;in terms of data quality,BDS-2+BDS-3 performed slightly better than GPS;in terms of baseline calculation,the fixed rate of wide and narrow lane ambiguities of BDS-2+BDS-3 were slightly lower than that of GPS,and the accuracy value of the baseline length of BDS-2+BDS-3 was about 2 mm lower than that of GPS,and the accuracy value of three directions of each station were calculated by BDS-2+BDS-3 and GPS were kept within 30 mm.Results of this experiment showed that the precision relative positioning accuracy of the current BDS-2+BDS-3 solution was not much different from the GPS accuracy and was at a high level.