MGEX差分码偏差产品对BDS-3伪距单点定位的影响研究

Influence of MGEX Differential Code Bias Products on BDS-3 Pseudorange Single Point Positioning

    摘要
  • 摘要: 为研究不同差分码偏差(differential code bias,DCB)产品对BDS-3伪距单点定位的影响,推导了BDS-3单频和双频无电离层组合伪距单点定位卫星端DCB改正模型,基于多模全球导航卫星系统（global navigation satellite system,GNSS）实验跟踪网发布的中国科学院(Chinese Academy of Sciences, CAS)和德国宇航中心(Deutsches Zentrum für Luftund Raumfahrt,DLR)两种DCB产品,并结合全球不同纬度均匀分布的国际GNSS服务测站连续7 天的BDS-3实测数据对B1I、B1C和B2a单频与B1C/B2a、B1I/B3I两种常用无电离层组合伪距单点定位精度进行对比分析。实验结果表明,在B1I、B1C、B2a 3种频率和B1C/B2a、B1I/B3I两种组合中,CAS产品改正后的定位精度整体上优于DLR产品,具体来说,定位精度的平均值在E、N、U 3个方向上分别提高了3 cm、1 cm和6 cm。

     

    Abstract:
    Objectives In order to study the influence of different differential code bias (DCB) products on BDS-3 pseudorange single point positioning, the BDS-3 single-frequency and dual-frequency ionospheric-free combined pseudorange single point positioning satellite-side DCB correction model was derived.
    Methods Based on two DCB products of Chinese Academy of Sciences (CAS) and Deutsches Zentrum für Luftund Raumfahrt(DLR) released by the multi-global navigation satellite system(GNSS) experiment, combined with the BDS-3 measured data from the International GNSS Service stations evenly distributed in different latitudes around the world for 7 days of B1I, B1C and B2a single frequency and B1C/B2a, B1I/B3I two commonly used ionospheric-free combined pseudorange single point positioning accuracy for comparison and analysis.
    Results Experimental results show that in the three frequencies of B1I, B1C, and B2a and the two combinations of B1C/B2a and B1I/B3I, the positioning accuracy of CAS products after correction is better than that of DLR products as a whole. Specifically, the average of positioning accuracy has increased 3 cm, 1 cm, and 6 cm in the directions of E, N, and U,respectively.
    Conclusions It can be concluded that for BDS-3 pseudorange single point positioning, the positioning accuracy of CAS products after correction is generally better than that of DLR products.

     

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