DCB对伪距单点定位/精密单点定位的影响分析

Influence Analysis of DCB on Pseudo Range Standard Point Positioning/Precise Point Positioning

针对差分码偏差(DCB)是影响定位精度的重要因素之一,对DCB的建模与分析具有重要的意义。因此,推导了DCB在双频模式下伪距单点定位(SPP)、精密单点定位(PPP)改正模型,并借助MGEX跟踪站连续3d观测数据进行SPP、PPP实验,实验结果表明:DCB改正前后,各测站SPP结果显示均为U方向精度最差,N方向、E方向精度基本相当,B1B2组合SPP的精度优于B1B3组合精度,DCB在N、E、U方向精度改善在米级,DCB对PPP的影响为厘米级,在N、E、U方向上的平均改善量分别为16.22%、17.77%、12.68%,B1B3组合经DCB改正后,其解算精度与B1B2仍有1~3 cm的差距。

As differential code bias(DCB)is one of the important factors affecting the positioning accuracy,the modeling and analysis of DCB is of great significance.We derived the correction models of pseudo range standard point positioning(SPP)and precise point positioning(PPP)for DCB in dual frequency mode,and conducted SPP and PPP experiments with the help of continuous 3-day observation data of MGEX track-ing station.The experimental results show that before and after DCB correction,the SPP results of each station show the worst accuracy in U di-rection.The accuracy of N direction and E direction is basically equivalent.The accuracy of the B1B2 combined SPP is better than that of the B1B3 combined SPP.The accuracy of DCB in the N,E and U directions is improved at meter level.The impact of DCB on the PPP is centimeter level.The average improvement in the N,E and U directions is 16.22%,17.77%and 12.68%respectively.After correction by DCB,the solution accura-cy of the B1B3 combined SPP still has a gap of 1~3 cm with that of the B1B2 combined SPP.