BDS-3精密单点定位性能比较分析

基于西安测绘研究所发布的BDS-3精密轨道和钟差产品，研究B1C-B2a双频组合的卫星端差分码偏差（DCB）改正模型，并分析中国科学院发布的DCB产品的稳定性。采用10个MGEX测站7 d的观测数据，对非差非组合和无电离层组合模型下的B1I-B3I、B1C-B2a两种双频组合的BDS-3精密单点定位精度进行对比分析。结果表明，BDS-3静态定位精度水平方向优于2.0 cm，高程方向优于2.5 cm，收敛时间在31 min左右；模拟动态定位精度水平方向优于3.4 cm ，高程方向优于4.1 cm，收敛时间在60 min左右；B1I-B3I、B1C-B2a两种双频组合定位精度相当且收敛时间较为接近，二者都可用于北斗精密单点定位。

Comparative Analysis of BDS-3 Precise Point Positioning Performance

On the basis of the BDS-3 precision orbit and clock products released by Xi’an Research Institute of Surveying and Mapping,we study the satellite differential code bias(DCB)correction model of B1C-B2a dual-frequency combination,and analyze the stability of DCB products released by the Chinese Academy of Sciences.The observation data of 7 days from 10 MGEX stations are used to compare and analyze the BDS-3 precise point positioning accuracy of B1I-B3I and B1C-B2a dual-frequency combination under the undifferenced and uncombined model and ionospheric-free combination model.The results show that the BDS-3 static positioning accuracy is better than 2.0 cm horizontally and 2.5 cm vertically,and the convergence time is about 31 min.The simulated dynamic positioning accuracy is better than 3.4 cm horizontally and 4.1 cm vertically,and the convergence time is about 60 min.The B1I-B3I and B1C-B2a dual-frequency combination positioning accuracy is nearly equal and the convergence time is close.Both can be used for BDS precise point positioning.