中文摘要：

针对北斗伪距精度和时间相关性研究较少的问题,该文引入最小二乘方差分量估计方法,对伪距与载波相位形成的电离层残差组合序列求高阶差分,构造伪距观测量的关系方程,并分析了北斗卫星伪距观测量的精度和时间相关性。结果表明,北斗伪距观测量的测量噪声在0.1～0.5m范围内,随高度角的增大而减小;不同频率的伪距噪声各有差异,高度角增大时差异减小,所有测站中B1的伪距噪声最大,B2、B3的大小关系随测站而异;地球同步轨道卫星的伪距精度优于倾斜地球同步轨道和中地球轨道卫星,且后两者差距较小;市场上两款北斗接收机的伪距测量精度相当。相关分析表明,当接收机采样频率等于或低于1Hz时,伪距观测量不存在明显的时间相关性;当采样频率高于1Hz时,伪距观测量表现出较强的时间相关性。

英文摘要：

According to the fact that there is no enough research about the accuracy and time correlation of BDS pseudorange observations,this paper introduced the least-squares variance component estimation（LS-VCE）method.The results showed that the measurement noise of BDS pseudorange was in range of 0.1～0.5m,reduced as the elevation angle increases;different frequency showed different code noise,and this difference decreased when the elevation became larger;for all sites,the pseudorange of B1 showed the largest noise,and the relationship between B2 and B3depended on each site;the GEO pseudorange was slightly more accurate than that of IGSO and MEO,while the IGSO pseudorange was as accurate as the MEO pseudorange;two types of BDS receiver presented the similar measurement accuracy for BDS pseudorange.When the sampling rate was smaller than 1Hz,the pseudorange did not show time correlation;otherwise,the pseudorange exhibited significant time correlation.