P1C1码偏差对精密单点定位收敛速度影响分析

The Impact Analysis of P1C1 Code Bias on Convergence of PPP

本文分析卫星端差分码偏差(DCB)产生的原理,根据伪距观测方程推导了精密单点定位(PPP)的DCB改正公式。采用MGEX参考站数据及精密产品进行PPP解算,详细分析了P1C1码偏差对定位参数收敛时间的影响。结果表明,改正DCB对于提高PPP收敛速度效果明显,其中静态PPP收敛时间平均缩短10 min,动态PPP平均缩短20 min,改正P1C1-DCB对PPP精度影响一般在毫米级水平。

This paper analyzed the satellite differential code bias（DCB）generated principle.Deduced the DCB correction formula of PPP.With multi-GNSS experiment data and precise clock/orbit/dcb products,this paper undertakes a thorough evaluation of DCB＇s influence on convergence of PPP.The results show the convergence time obviously reduced when corrected P1C1-DCB,in which the static PPP convergence time is reduced by an average of 10 minutes,dynamic PPP average reduced by an average of 20 minutes,correct P1C1-DCB on PPP accuracy is generally in millimeter level.