中文摘要：

采用伪距与载波相位组合观测历元M差分法及二次多项式拟合法，分析了北斗导航系统伪距观测值精度，研究了影响伪距测量精度的各项误差。理论分析与实际试验结果表明，北斗系统伪距测距噪声在0．10m～0．30m之间，测距噪声随高度角增大而减小；B1频点测距噪声最大，B2、B3频点次之；MEO卫星测距噪声大于IGSO、GEO卫星测距噪声；二次多项式拟合法能有效地分析测距噪声，高度角较低时可以得到比组合观测历元差分法更优的结果。

英文摘要：

The code-minus-carTier （CC） epoch difference method and the quadratic polynomial fitting are used to analyze the pseudorange observation accuracy of BDS, and measurement errors affecting the pseudorange measurement accuracy are studied. Theoretical analysis and test results show that the pseudorange noise of BDS is within 0.1 -0.3m, and it reduces as the elevation angle increases ; the loudest noise appears in B1, and becomes slighter in B2 and B3 ; the pseudorange noise of MEO is louder than that of IGSO and GEO ; the quadratic polynomial fitting method is effective in pseudorange noise analysis, and it will achieve a better result than that of the CC epoch difference method when the elevation angle is lower.