BDS-3/GPS双频RTK定位性能分析

Performance Analysis of BDS-3/GPS Dual Frequency RTK Positioning

为了系统地分析评估BDS-3 B1C/B2a频点的实时动态(Real-Time Kinematic,RTK)定位性能,选取了短基线和中长基线2组基线,设计了GPS L1/L2分别联合BDS-2 B1I/B2I、BDS-3 B1I+B3I、BDS-3 B1C/B2a进行RTK定位实验3种方案,分别对各组实验的有效卫星数、卫星空间几何强度以及定位精度方面进行分析。实验结果表明,各组实验有效卫星最少为12颗,位置精度因子(Position Dilution of Precision,PDOP)值最大为1.48,满足高精度定位需求;在短基线条件下,3种定位方案的平面及高程定位精度均优于6 mm,采用B1C/B2a频点观测数据的三维定位精度相较于B1I/B2I和B1I/B3I分别有33.6%和16.4%的提升;在中长基线条件下,3种定位方案的平面定位精度均优于1 cm,高程定位精度优于3 cm,采用B1C/B2a频点观测数据的三维定位精度相较于B1I/B2I和B1I/B3I分别提升了25.0%和7.7%。实验结果证明了联合GPS和BDS-3 B1C/B2a新频点进行RTK定位,可以取得较好的效果。

In order to systematically analyze and evaluate the Real-Time Kinematic(RTK)positioning performance of the B1C/B2a frequency point of the BDS-3,two sets of baselines,short baseline and medium long baseline,are selected.Three RTK positioning experiments are designed using GPS L1/L2 in combination with BDS-2 B1I/B2I,BDS-3 B1I+B3I,and BDS-3 B1C/B2a,respectively.The effective number of satellites,satellite spatial geometric strength,and positioning accuracy of each group of experiments are analyzed.The experimental results show that the minimum number of effective satellites in each group of experiments is 12,and the maximum Position Dilution of Precision(PDOP)value is 1.48,which meets the needs of high-precision positioning.Under short baseline conditions,the plane and elevation positioning accuracy of the three positioning schemes are better than 6 mm.And the 3D positioning accuracy using B1C/B2a frequency point observation data is improved by 33.6%and 16.4%compared to B1I/B2I and B1I/B3I,respectively.Under medium to long baseline conditions,the plane positioning accuracy of the three positioning schemes is better than 1 cm,and the elevation positioning accuracy is better than 3 cm.Compared to B1I/B2I and B1I/B3I,the 3D positioning accuracy using B1C/B2a frequency point observation data has increased by 25.0%and 7.7%,respectively.The experimental results demonstrate that combining GPS and BDS-3 B1C/B2a new frequency points for RTK positioning can achieve good results.