国家GNSS基准站解算BDS/GPS精度对比分析

Comparative analysis of BDS/GPS accuracy for national GNSS stations

以国家GNSS基准站的多系统数据为研究对象,以单系统单日解算数据为研究视角,通过高精度基线和精密单点定位两种解算方法,对BDS与GPS两大系统进行单系统数据解算,并对结果进行对比分析。实验结果表明,通过双差高精度基线解算,GPS水平方向的精度可以达到mm级,高程方向的精度可以达到cm级,BDS在水平方向和高程方向都能达到cm级的精度;通过非差精密单点定位解算,GPS在水平方向和高程方向都能达到cm级的精度,BDS在水平方向和高程方向也能达到cm级的精度,但相对于GPS的定位精度表现略差。当前BDS不管采用哪种解算方式,相对于GPS的精度都略有差距,在具体改善BDS精度的问题上,还有许多问题值得探讨。

Aiming at whether there is still a big gap between the positioning performance of BDS and the positioning performance of GPS,taking the multi-system data of national GNSS reference station as the research object,and taking the single-system single-day solution calculation data as the research perspective,this paper uses the high-precision baseline to propose two methods of precise point positioning solution.The single system data is solved for BDS and GPS systems,and the results are compared and analyzed.The experimental result shows that through the double-difference high-precision baseline solution,the GPS horizontal direction can reach the accuracy of mm level,the elevation direction can reach the accuracy of cm level,and the BDS can achieve the accuracy of cm level in both the horizontal direction and the elevation direction;through precise point positioning solution,GPS can achieve cm-level accuracy in both horizontal and elevation directions.BDS can also achieve cm-level accuracy in horizontal and elevation directions,but slightly worse than GPS positioning accuracy.The paper believes that the current BDS does not have any solution to the accuracy of GPS.There are still many problems in the improvement of BDS accuracy.