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Epoch-by-epoch estimation and analysis of BeiDou Navigation Satellite System (BDS) receiver differential code biases with the additional BDS-3 observations
Annales Geophysicae ( IF 1.7 ) Pub Date : 2020-10-28 , DOI: 10.5194/angeo-38-1115-2020 Qisheng Wang , Shuanggen Jin , Youjian Hu
Annales Geophysicae ( IF 1.7 ) Pub Date : 2020-10-28 , DOI: 10.5194/angeo-38-1115-2020 Qisheng Wang , Shuanggen Jin , Youjian Hu
Abstract. The differential code bias (DCB) of the Global Navigation Satellite System (GNSS) is an important error source in ionospheric
modeling, which was generally estimated as constants every day. However, the
receiver DCB may be changing due to the varying spatial environments and
temperatures. In this paper, a method based on the global ionospheric
map (GIM) of the Center for Orbit Determination in Europe (CODE) is presented
to estimate the BeiDou Navigation Satellite System (BDS) receiver DCB with epoch-by-epoch estimates. The BDS receiver DCBs
are analyzed from 30 d of Multi-GNSS Experiment observations. The
comparison of estimated receiver DCB of BDS with the DCB provided by the German
Aerospace Center (DLR) and the Chinese Academy of Sciences (CAS) shows a good
agreement. The root-mean-square (rms) values of receiver DCB are 0.43 and
0.80 ns with respect to the DLR and CAS estimates, respectively. In terms of the intraday
variability of receiver DCB, most of the receiver DCBs show relative
stability within 1 d with the intraday standard deviation (SD) of less
than 1 ns. However, larger fluctuations with more than 2 ns of intraday
receiver DCB are found. Besides, the intraday stability of receiver DCB
calculated by the third-generation BDS (BDS-3) and the second-generation BDS
(BDS-2) observations is compared. The result shows that the intraday
stability of BDS-3 receiver DCB is better than that of BDS-2 receiver DCB.
更新日期:2020-10-28