Estimation of BDS DCB Combining GIM and Different Zero-mean Constraints

doi:10.11947/j.AGCS.2017.20160375

Abstract

Abstract: As the limited number of the BeiDou Navigation Satellite System (BDS) satellites and tracking stations currently, it's difficult to attain daily DCBs solution with precisely high accuracy based on BeiDou single system. In order to overcome the weakness above, two different zero-mean constraints for BDS satellites, called constraint one and constraint two, respectively, are used to estimate DCBs of BDS based on BeiDou observations from the multi-GNSS experiment (MGEX) network and global ionosphere maps (GIM) from the Center for Orbit Determination in Europe (CODE). The results show that the systematic difference of the overall trend under two different constraints is consistent, and the systematic difference of DCB_C2I-C7I and DCB_C2I-C6I is -3.3 ns and 1.2 ns, respectively. The systematic difference between BDS satellite DCBs and receiver DCBs has the same absolute value, but opposite signs instead. Compared to constraint one, The DCBs estimation of IGSO/MEO satellites under constraint two are more stable (the improvement of satellites DCB_C2I-C7I and DCB_C2I-C6I STD are up to 21%, 13%, respectively), the stability of IGSO and MEO satellites (STDs are within 0.1 ns, 0.2 ns, respectively) is better than that of GEO satellites (STDs are 0.15~0.32 ns). DCB estimation of constraint one is not only consistent with the CAS/DLR products (Bias:-0.4~0.2 ns), but also takes into account the stability of BDS satellites DCB. Under the two different constraints, there is no obvious change in BDS receiver DCBs, meaning that the selection of constraints has no obvious influence on the stability of BDS receivers DCBs. The overall stability of BDS receiver DCBs is better than 1 ns. Due to the accuracy discrepancy of GIM in different latitudes, the stability of BDS receiver DCBs in the middle-high latitude (STDs are within 0.4 ns) is better than that in low latitude region (STDs are 0.8~1 ns).

Key words: differential code bias (DCB), BeiDou Navigation Satellite System (BDS), global Ionosphere maps (GIM), zero-mean constraint

CLC Number:

P228

YAO Yibin, LIU Lei, KONG Jian, FENG Xinying. Estimation of BDS DCB Combining GIM and Different Zero-mean Constraints[J]. Acta Geodaetica et Cartographica Sinica, 2017, 46(2): 135-143.

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