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中文摘要：
对MGEX发布的北斗差分码偏差（differential code biases,DCB）产品的精度与稳定性进行质量分析,比较其日解产品与周解产品,并利用交叠式Allan方差初步计算分析北斗差分码偏差的随机误差特性。结果表明,北斗系统IGSO卫星DCB产品精度与稳定性最优,MEO次之,GEO最差。3种产品中,DCBB2B3的精度与稳定性最优,DCBB1B2次之,DCBB1B3最差。实验分析得出,北斗系统DCB随机误差组合主要为WN＋GM,DCBB1B2、DCBB1B3与DCBB2B3的高斯白噪声分别为0.16ns、0.15ns、0.09ns;一阶马尔可夫过程噪声分别为0.093ns/d、0.049ns/d、0.058ns/d,相关时间分别为42.63d、85.79d、42.63d。
英文摘要：
This paper first analyzes the accuracy and stabilities of multi-GNSS experiment（MGEX）BDSDCB.It then performs a comprehensive analysis of the difference of daily and weekly DCB,as well as computer noise components and parameters of the BDS DCB.The results indicate that the IGSO DCB is the best,followed by MEO,while the last is GEO.The accuracy and stability of DCBB1B2 is better than the others,DCBB2B3 is the worst.A large amount of experimental data shows that the noise component of BDS is mainly Gaussian white noise（WN）as well as first order Gauss-Markov（GM）process noise.The DCB WN is 0.16 ns,0.15 ns,0.09ns;the GM process noise is 0.093ns/d,0.049ns/d,0.058ns/d,and the correlation time is 42.63 d,85.79 d,42.63 d.
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