Based on the PPP-B2b service provided by the new BDS3 satellite navigation system,the performance of PPP including convergence time and positioning accuracy is analyzed via receivers with different pseudo-range accuracies.The results show that the accuracy of BDS3-only system after convergence(about 30 min) is better than 0.15 m in horizontal and 0.17 m in vertical direction,respectively.While the accuracy of BDS3/GPS dual system after convergence(about 20 min) is 0.11 m in horizontal and 0.13 m in vertical direction,respectively,both of which are better than the BDS3-only solution.The accuracy of BDS3/GPS solution is improved by 26.7% and 23.5% in horizontal and vertical direction,respectively,when compared with BDS3-only solution.In addition,it also shows that the receiver A with average pseudo-range accuracy of 1.681 m can reach 3D accuracy of 0.331 m(BDS3-only) after convergence of 30 min,and realize 3D accuracy of 0.250 m(BDS3/GPS) after convergence of 20 min in static mode.For the receiver B with average pseudo-range accuracy of 0.873 m,the 3D accuracy is improved from 0.221 m(BDS3-only) with convergence time of 30 min,to 0.167 m(BDS3/GPS) with convergence time of 20 min in static mode.From the above comparisons,it is clearly shown that the receiver B with pseudo-range improved by 0.808 m,can improve positioning accuracy by 33.4% after convergence in BDS3-only solution and 33.2% in BDS3/GPS solution,respectively.