基于GAMIT对国家GNSS基准站进行的北斗基线解算分析

Beidou baseline solution based on GAMIT for national GNSS stations

以国家GNSS站的多系统观测数据为研究对象,旨在以单系统解算为研究视角,通过GAMIT软件对BDS/GPS数据进行单系统解算的方法,力图为利用BDS/GPS做基线解算提供参照。实验结果表明,BDS基线解算的相对精度与GPS相当;单BDS数据解算的基线东西方向精度10～12 mm,较单GPS数据解算的基线东西方向精度低42%,高程方向的单BDS基线中误差25 mm,是单GPS基线高程方向中误差的2倍;而组合双系统解算能有效提升基线U方向的精度,提升1 cm左右。文中认为目前利用BDS进行基线解算的精度尚不与GPS精度相当,在利用北斗系统进行高精度定位中,还有许多问题值得探讨。

The paper takes the multi-system observation data of the national GNSS station as the research object,aiming at the single system solution as the research perspective,using the GAMIT software to perform the single system solution method for the BDS/GPS data,and trying to use the BDS/GPS as the baseline solution.Counting provides a reference.The experimental results show that the relative accuracy of BDS baseline calculation is comparable to that of GPS;the baseline east-west direction accuracy of a single BDS data solution is 10~12 mm,42% lower than the baseline east-west direction resolution of single GPS data,and the single BDS in elevation direction the error in the baseline is 25 mm,which is twice the error in the elevation direction of the single GPS baseline;and the combined dual system solution can effectively improve the accuracy of the baseline U direction by about 1 cm.The result finds that the accuracy of the baseline solution using BDS is not as accurate as the GPS accuracy.There are many problems worth exploring in the use of the Beidou system for high-precision positioning.